Initial commit

src/main/java/tf/tuff/NetworkListener.java

@@ -0,0 +1,32 @@
+package tf.tuff;
+
+import com.github.retrooper.packetevents.event.PacketListener;
+import com.github.retrooper.packetevents.event.PacketSendEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerChunkData;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+public class NetworkListener implements PacketListener {
+
+	private final TuffX plugin;
+
+	public NetworkListener(TuffX plugin) {
+		this.plugin = plugin;
+	}
+
+	@Override
+	public void onPacketSend(PacketSendEvent event) {
+		if (event.getPacketType() == PacketType.Play.Server.CHUNK_DATA) {
+			Player player = (Player) event.getPlayer();
+			if (player == null) return;
+
+			WrapperPlayServerChunkData wrapper = new WrapperPlayServerChunkData(event);
+			int chunkX = wrapper.getColumn().getX();
+			int chunkZ = wrapper.getColumn().getZ();
+
+			World world = player.getWorld();
+			plugin.y0Plugin.chunkPacketListener.handleChunk(plugin, player, world, chunkX, chunkZ);
+		}
+	}
+}

src/main/java/tf/tuff/ServerRegistry.java

@@ -0,0 +1,68 @@
+package tf.tuff;
+
+import org.bukkit.plugin.java.JavaPlugin;
+import org.java_websocket.client.WebSocketClient;
+import org.java_websocket.handshake.ServerHandshake;
+import java.net.URI;
+
+import tf.tuff.util.SchedulerCompat;
+
+public class ServerRegistry {
+	private final JavaPlugin p;
+	private final String wsUrl;
+	private final String server;
+	private WebSocketClient client;
+	private volatile boolean running = true;
+
+	public ServerRegistry(JavaPlugin pl, String registryUrl, String serverAddr) {
+		p = pl;
+		wsUrl = registryUrl;
+		server = serverAddr;
+	}
+
+	public void connect() {
+		SchedulerCompat.runAsync(p, this::doConnect);
+	}
+
+	private void doConnect() {
+		if (!running)
+			return;
+
+		try {
+			client = new WebSocketClient(new URI(wsUrl)) {
+				@Override
+				public void onOpen(ServerHandshake h) {
+					send("{\"type\":\"register\",\"server\":\"" + server + "\"}");
+				}
+
+				@Override
+				public void onMessage(String msg) {
+				}
+
+				@Override
+				public void onClose(int code, String reason, boolean remote) {
+					if (running) {
+						SchedulerCompat.runAsyncLater(p, ServerRegistry.this::doConnect, 100L);
+					}
+				}
+
+				@Override
+				public void onError(Exception e) {
+				}
+			};
+			client.setConnectionLostTimeout(30);
+			client.connect();
+		} catch (Exception e) {
+			if (running) {
+				SchedulerCompat.runAsyncLater(p, this::doConnect, 100L);
+			}
+		}
+	}
+
+	public void disconnect() {
+		running = false;
+		if (client != null) {
+			client.close();
+		}
+	}
+}

src/main/java/tf/tuff/TuffX.java

@@ -0,0 +1,354 @@
+package tf.tuff;
+
+import java.io.File;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.*;
+import org.bukkit.event.entity.EntityToggleSwimEvent;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.world.ChunkLoadEvent;
+import org.bukkit.plugin.PluginDescriptionFile;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.plugin.java.JavaPluginLoader;
+import org.bukkit.plugin.messaging.PluginMessageListener;
+
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.event.PacketListenerPriority;
+import io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder;
+
+import tf.tuff.netty.ChunkInjector;
+import tf.tuff.tuffactions.TuffActions;
+import tf.tuff.util.SchedulerCompat;
+import tf.tuff.viablocks.ViaBlocksPlugin;
+import tf.tuff.viaentities.ViaEntitiesPlugin;
+import tf.tuff.y0.Y0Plugin;
+
+public class TuffX extends JavaPlugin implements Listener, PluginMessageListener {
+
+	public ServerRegistry serverRegistry;
+
+	public Y0Plugin y0Plugin;
+	public ViaBlocksPlugin viaBlocksPlugin;
+	public TuffActions tuffActions;
+	public ViaEntitiesPlugin viaEntitiesPlugin;
+	private ChunkInjector chunkInjector;
+	private boolean packetEventsEnabled;
+
+	// required by MockBukkit
+	public TuffX(JavaPluginLoader loader, PluginDescriptionFile description, File dataFolder, File file) {
+		super(loader, description, dataFolder, file);
+	}
+	public TuffX() { super(); }
+
+	@Override
+	public void onLoad() {
+		this.y0Plugin = new Y0Plugin(this);
+		this.viaBlocksPlugin = new ViaBlocksPlugin(this);
+		this.tuffActions = new TuffActions(this);
+		this.viaEntitiesPlugin = new ViaEntitiesPlugin(this);
+
+		if (shouldBootstrapPacketEvents()) {
+			PacketEvents.setAPI(SpigotPacketEventsBuilder.build(this));
+			PacketEvents.getAPI().getSettings().reEncodeByDefault(false)
+					.checkForUpdates(false);
+			PacketEvents.getAPI().load();
+			packetEventsEnabled = true;
+		}
+	}
+
+	@Override
+	public void onEnable() {
+		if (packetEventsEnabled && PacketEvents.getAPI() != null) {
+			PacketEvents.getAPI().init();
+		} else {
+			packetEventsEnabled = false;
+		}
+
+		saveDefaultConfig();
+
+		getLogger().info(SchedulerCompat.isFolia()
+			? "Folia detected. Using region and entity schedulers."
+			: "Using standard Bukkit-compatible schedulers.");
+
+		y0Plugin.onTuffXEnable();
+		tuffActions.onTuffXEnable();
+		viaBlocksPlugin.onTuffXEnable();
+		viaEntitiesPlugin.onTuffXEnable();
+
+		chunkInjector = new ChunkInjector(viaBlocksPlugin.blockListener, y0Plugin);
+		viaBlocksPlugin.blockListener.setChunkInjector(chunkInjector);
+		y0Plugin.setChunkInjector(chunkInjector);
+
+		getConfig().options().copyDefaults(true);
+		saveConfig();
+
+		getServer().getScheduler().runTaskTimer(this, () -> {
+			Runtime runtime = Runtime.getRuntime();
+
+			long used = runtime.totalMemory() - runtime.freeMemory();
+			long max = runtime.maxMemory();
+
+			double percent = (double) used / (double) max;
+
+			if (percent >= 0.80D) {
+				if (y0Plugin != null) {
+					y0Plugin.forceClearCache();
+				}
+
+				getLogger().warning("[TuffXPlus] Memory watchdog cleared Y0 cache. Used: " + (used / 1024L / 1024L) + "MB / " + (max / 1024L / 1024L) + "MB");
+			}
+
+			if (percent >= 0.95D) {
+				System.gc();
+				getLogger().warning("[TuffXPlus] Emergency GC requested.");
+			}
+		}, 20L * 60L, 20L * 60L);
+
+		if (packetEventsEnabled) {
+			PacketEvents.getAPI().getEventManager().registerListener(
+				new NetworkListener(this), PacketListenerPriority.NORMAL
+			);
+		}
+
+		getServer().getPluginManager().registerEvents(this, this);
+
+		setupRegistry();
+		lfe();
+	}
+
+	private void setupRegistry() {
+		if (getConfig().getBoolean("registry.enabled", false)) {
+			String url = getConfig().getString("registry.server-url");
+			String ws = getConfig().getString("registry.server");
+
+			if (ws != null && !ws.isEmpty() && !ws.equals("wss://urserverip.net")) {
+				serverRegistry = new ServerRegistry(this, url, ws);
+				serverRegistry.connect();
+			}
+		}
+	}
+
+	@Override
+	public void onDisable() {
+		y0Plugin.onTuffXDisable();
+		viaBlocksPlugin.onTuffXDisable();
+		viaEntitiesPlugin.onTuffXDisable();
+
+		if (serverRegistry != null) {
+			serverRegistry.disconnect();
+			serverRegistry = null;
+		}
+
+		if (packetEventsEnabled && PacketEvents.getAPI() != null) {
+			PacketEvents.getAPI().terminate();
+		}
+		packetEventsEnabled = false;
+
+		getServer().getMessenger().unregisterIncomingPluginChannel(this);
+		getServer().getMessenger().unregisterOutgoingPluginChannel(this);
+	}
+
+	private boolean shouldBootstrapPacketEvents() {
+		return getServer() == null
+			|| !getServer().getClass().getName().startsWith("be.seeseemelk.mockbukkit");
+	}
+
+	public void reloadTuffX(){
+		saveDefaultConfig();
+		reloadConfig();
+		getConfig().options().copyDefaults(true);
+		saveConfig();
+
+		if (serverRegistry != null) {
+			serverRegistry.disconnect();
+			serverRegistry = null;
+		}
+
+		setupRegistry();
+
+		viaBlocksPlugin.onTuffXReload();
+		y0Plugin.onTuffXReload();
+		tuffActions.onTuffXReload();
+		viaEntitiesPlugin.onTuffXReload();
+
+		getLogger().info("TuffX reloaded.");
+	}
+
+	public boolean TuffXCommand(CommandSender sender, Command command, String label, String[] args){
+		if (args.length > 0) {
+			if (args[0].equalsIgnoreCase("reload")) {
+				if (!(sender instanceof Player)) {
+					reloadTuffX();
+				} else {
+					Player player = (Player) sender;
+					if (!player.hasPermission("tuffx.reload")) {
+						player.sendMessage("§cYou do not have permission to use this command.");
+						return false;
+					}
+					reloadTuffX();
+					player.sendMessage("TuffX reloaded.");
+				}
+			}
+		}
+		return true;
+	}
+
+	@Override
+	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (command.getName().equalsIgnoreCase("tuffx")) return TuffXCommand(sender, command, label, args);
+		if (command.getName().equalsIgnoreCase("viablocks")) return viaBlocksPlugin.onTuffXCommand(sender, command, label, args);
+		if (command.getName().equalsIgnoreCase("restrictions")) return tuffActions.onTuffXCommand(sender, command, label, args);
+		if (command.getName().equalsIgnoreCase("tuffxclearcache")) {
+			if (!sender.hasPermission("tuffx.admin")) {
+				sender.sendMessage("§cNo permission.");
+				return true;
+			}
+
+			if (y0Plugin != null) {
+				y0Plugin.forceClearCache();
+			}
+
+			Runtime runtime = Runtime.getRuntime();
+			long used = runtime.totalMemory() - runtime.freeMemory();
+			long max = runtime.maxMemory();
+
+			sender.sendMessage("§aTuffXPlus Y0 cache cleared.");
+			sender.sendMessage("§7Used RAM: §f" + (used / 1024L / 1024L) + "MB / " + (max / 1024L / 1024L) + "MB");
+			return true;
+		}
+
+		return true;
+	}
+
+	@Override
+	public void onPluginMessageReceived(String channel, Player player, byte[] message) {
+		if (!player.isOnline()) return;
+
+		if (channel.equals("eagler:below_y0")) y0Plugin.handlePacket(player,message);
+		else if (channel.equals("viablocks:handshake")) viaBlocksPlugin.handlePacket(player,message);
+		else if (channel.equals("eagler:tuffactions")) tuffActions.handlePacket(player,message);
+		else if (channel.equals("entities:handshake")) viaEntitiesPlugin.handlePacket(player,message);
+		else getLogger().warning("Received plugin message on unknown channel '%s' from %s".formatted(channel, player.getName()));
+	}
+
+	@EventHandler(priority = EventPriority.MONITOR)
+	public void onPlayerChangeWorld(PlayerChangedWorldEvent e) {
+		y0Plugin.handlePlayerChangeWorld(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockForm(BlockFormEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockForm(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockFade(BlockFadeEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockFade(e);
+	}
+
+	@EventHandler(priority = EventPriority.MONITOR)
+	public void onPlayerJoin(PlayerJoinEvent e) {
+		y0Plugin.handlePlayerJoin(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockGrow(BlockGrowEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockGrow(e);
+	}
+
+	@EventHandler
+	public void onPlayerQuit(PlayerQuitEvent e) {
+		y0Plugin.handlePlayerQuit(e);
+		tuffActions.handlePlayerQuit(e);
+		viaBlocksPlugin.blockListener.handlePlayerQuit(e);
+		viaEntitiesPlugin.handlePlayerQuit(e);
+	}
+
+	@EventHandler
+	public void onToggleSwim(EntityToggleSwimEvent e) {
+		tuffActions.handleToggleSwim(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockSpread(BlockSpreadEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockSpread(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockBreak(BlockBreakEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockBreak(e);
+		y0Plugin.handleBlockBreak(e);
+	}
+
+	@EventHandler
+	public void onPlayerInventoryClick(InventoryClickEvent e) {
+		tuffActions.handlePlayerInventoryClick(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockPlace(BlockPlaceEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockPlace(e);
+		y0Plugin.handleBlockPlace(e);
+	}
+
+	@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+	public void onBlockPhysics(BlockPhysicsEvent e) {
+		y0Plugin.handleBlockPhysics(e);
+		viaBlocksPlugin.blockListener.handleBlockPhysics(e);
+	}
+
+	@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+	public void onChunkLoad(ChunkLoadEvent e) {
+		y0Plugin.handleChunkLoad(e);
+		viaBlocksPlugin.blockListener.handleChunkLoad(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockExplode(BlockExplodeEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockExplode(e);
+		y0Plugin.handleBlockExplode(e);
+	}
+
+	@EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+	public void onBlockFromTo(BlockFromToEvent e) {
+		viaBlocksPlugin.blockListener.handleBlockFromTo(e);
+		y0Plugin.handleBlockFromTo(e);
+	}
+
+	private void lfe() {
+		getLogger().info("");
+		getLogger().info("████████╗██╗   ██╗███████╗ ███████╗ ██╗  ██╗     ██╗");
+		getLogger().info("╚══██╔══╝██║   ██║██╔════╝ ██╔════╝ ╚██╗██╔╝     ██║");
+		getLogger().info("   ██║   ██║   ██║██████╗  ██████╗   ╚███╔╝ ████████████╗");
+		getLogger().info("   ██║   ██║   ██║██╔═══╝  ██╔═══╝   ██╔██╗ ╚════██╔════╝");
+		getLogger().info("   ██║   ╚██████╔╝██║      ██║      ██╔╝╚██╗     ██║");
+		getLogger().info("   ╚═╝    ╚═════╝ ╚═╝      ╚═╝      ╚═╝  ╚═╝     ╚═╝");
+		getLogger().info("");
+		getLogger().info("CREDITS");
+		getLogger().info("");
+		getLogger().info("Y0 support:");
+		getLogger().info("• Below y0 (client + plugin) programmed by Potato (@justatypicalpotato)");
+		getLogger().info("• llucasandersen - plugin optimizations");
+		getLogger().info("");
+		getLogger().info("ViaBlocks:");
+		getLogger().info("• ViaBlocks partial plugin and client rewrite by Potato");
+		getLogger().info("• llucasandersen (Complex client models and texture fixes,");
+		getLogger().info("	  optimizations, PacketEvents migration and async safety fixes)");
+		getLogger().info("• coleis1op, if ts is driving me crazy, im taking credit");
+		getLogger().info("");
+		getLogger().info("Other:");
+		getLogger().info("• Swimming and creative items programmed by Potato (@justatypicalpotato)");
+		getLogger().info("• shaded build, 1.14+ support (before merge) - llucasandersen");
+		getLogger().info("• Restrictions - UplandJacob");
+		getLogger().info("• Overall plugin merges by Potato");
+		getLogger().info("• Major Ram optimizations - MrNorshare");
+	}
+}

src/main/java/tf/tuff/netty/BaseInjector.java

@@ -0,0 +1,77 @@
+package tf.tuff.netty;
+
+import com.viaversion.viaversion.api.Via;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandler;
+import org.bukkit.entity.Player;
+
+import java.util.UUID;
+
+public abstract class BaseInjector {
+
+	private final String handlerName;
+
+	protected BaseInjector(String handlerName) {
+		this.handlerName = handlerName;
+	}
+
+	protected abstract ChannelHandler createHandler(Player player);
+
+	protected void onPostInject(Player player) {
+	}
+
+	public void inject(Player player) {
+		UUID uuid = player.getUniqueId();
+		var viaConnection = Via.getAPI().getConnection(uuid);
+		if (viaConnection == null) return;
+
+		Channel channel = viaConnection.getChannel();
+		if (channel == null) return;
+
+		channel.eventLoop().submit(() -> {
+			try {
+				if (channel.pipeline().get(handlerName) != null) {
+					channel.pipeline().remove(handlerName);
+				}
+
+				String targetHandler = null;
+				String[] anchors = {"packet_handler", "encoder", "via-encoder"};
+				for (int i = 0; i < anchors.length; ++i) {
+					if (channel.pipeline().get(anchors[i]) != null) {
+						targetHandler = anchors[i];
+						break;
+					}
+				}
+
+				ChannelHandler handler = createHandler(player);
+				if (targetHandler != null) {
+					channel.pipeline().addBefore(targetHandler, handlerName, handler);
+				} else {
+					channel.pipeline().addFirst(handlerName, handler);
+				}
+
+				onPostInject(player);
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		});
+	}
+
+	public void eject(Player player) {
+		UUID uuid = player.getUniqueId();
+		var viaConnection = Via.getAPI().getConnection(uuid);
+		if (viaConnection == null) return;
+
+		Channel channel = viaConnection.getChannel();
+		if (channel != null && channel.isOpen()) {
+			channel.eventLoop().submit(() -> {
+				try {
+					if (channel.pipeline().get(handlerName) != null) {
+						channel.pipeline().remove(handlerName);
+					}
+				} catch (Exception e) {
+				}
+			});
+		}
+	}
+}

src/main/java/tf/tuff/netty/ChunkHandler.java

@@ -0,0 +1,455 @@
+package tf.tuff.netty;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.CompositeByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelOutboundHandlerAdapter;
+import io.netty.channel.ChannelPromise;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import tf.tuff.viablocks.CustomBlockListener;
+import tf.tuff.y0.Y0Plugin;
+import tf.tuff.util.SchedulerCompat;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+
+public class ChunkHandler extends ChannelOutboundHandlerAdapter {
+
+	private final CustomBlockListener viaBlocks;
+	private final Y0Plugin y0;
+	private final Player player;
+	private final UUID playerId;
+	private final Map<Long, QueuedPacket> queue = new ConcurrentHashMap<>();
+	private volatile ChannelHandlerContext ctx;
+
+	private static final long TIMEOUT_MS = 500;
+
+	static record BlockChangePosition(int x, int y, int z) {}
+
+	public ChunkHandler(CustomBlockListener viaBlocks, Y0Plugin y0, Player player) {
+		this.viaBlocks = viaBlocks;
+		this.y0 = y0;
+		this.player = player;
+		this.playerId = player.getUniqueId();
+	}
+
+	private static class QueuedPacket {
+		final ByteBuf buf;
+		final ChannelPromise promise;
+		final int chunkX;
+		final int chunkZ;
+		final long time;
+		volatile boolean viaReady;
+		volatile boolean y0Ready;
+		volatile byte[] viaData;
+		volatile byte[] y0Data;
+
+		QueuedPacket(ByteBuf buf, ChannelPromise promise, int cx, int cz) {
+			this.buf = buf;
+			this.promise = promise;
+			this.chunkX = cx;
+			this.chunkZ = cz;
+			this.time = System.currentTimeMillis();
+		}
+	}
+
+	@Override
+	public void handlerAdded(ChannelHandlerContext ctx) {
+		this.ctx = ctx;
+	}
+
+	@Override
+	public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+		if (!(msg instanceof ByteBuf)) {
+			super.write(ctx, msg, promise);
+			return;
+		}
+
+		ByteBuf buf = (ByteBuf) msg;
+		buf.markReaderIndex();
+
+		try {
+			int packetId = readVarInt(buf);
+
+			if (packetId == 0x20) {
+				handleChunkPacket(ctx, buf, promise);
+				return;
+			}
+
+			if (packetId == 0x0B && isViaActive()) {
+				handleBlockChange(ctx, buf, promise);
+				return;
+			}
+
+			if (packetId == 0x10 && isViaActive()) {
+				handleMultiBlockChange(ctx, buf, promise);
+				return;
+			}
+
+		} catch (Exception e) {
+		} finally {
+			if (buf.refCnt() > 0 && msg == buf) {
+				buf.resetReaderIndex();
+			}
+		}
+
+		super.write(ctx, msg, promise);
+	}
+
+	private boolean isViaActive() {
+		return viaBlocks != null
+			&& viaBlocks.plugin.isEnabled()
+			&& viaBlocks.plugin.isPlayerEnabled(player);
+	}
+
+	private void handleChunkPacket(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise) throws Exception {
+		int chunkX = buf.readInt();
+		int chunkZ = buf.readInt();
+		buf.resetReaderIndex();
+
+		boolean viaActive = isViaActive();
+		byte[] viaData = viaActive ? viaBlocks.getExtraDataForChunk(player.getWorld().getName(), chunkX, chunkZ) : null;
+		byte[] y0Data = y0 != null ? y0.getY0DataForChunk(player, chunkX, chunkZ) : null;
+
+		boolean needY0 = y0 != null && y0.isPlayerReady(player);
+
+		boolean viaReady = !viaActive || viaData != null;
+		boolean y0Ready = !needY0 || y0Data != null;
+
+		if (viaReady && y0Ready) {
+			writeWithData(ctx, buf, promise, viaData, y0Data);
+			return;
+		}
+
+		long key = key(chunkX, chunkZ);
+		QueuedPacket q = new QueuedPacket(buf.retain(), promise, chunkX, chunkZ);
+		q.viaReady = viaReady;
+		q.y0Ready = y0Ready;
+		q.viaData = viaData;
+		q.y0Data = y0Data;
+		QueuedPacket old = queue.put(key, q);
+
+		if (queue.size() > 256) {
+			clearOldQueuePackets(1000L);
+		}
+
+		if (queue.size() > 1024) {
+			forceClearQueue();
+		}
+
+		if (old != null) {
+			if (old.buf.refCnt() > 0) {
+				old.buf.release();
+			}
+
+			if (!old.promise.isDone()) {
+				old.promise.tryFailure(new RuntimeException("Replaced queued chunk packet"));
+			}
+		}
+
+		if (!viaReady) {
+			requestViaCache(chunkX, chunkZ, key);
+		}
+		if (!y0Ready) {
+			requestY0Cache(chunkX, chunkZ, key);
+		}
+
+		scheduleTimeout(key);
+	}
+
+	private void handleBlockChange(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise) throws Exception {
+		BlockChangePosition position = decodeSingleBlockChangePosition(buf.getLong(buf.readerIndex()));
+		resolveViaDataOnRegionThread(ctx, buf, promise, player.getWorld(), position.x >> 4, position.z >> 4, () -> {
+			World world = player.getWorld();
+			if (!world.isChunkLoaded(position.x >> 4, position.z >> 4)) {
+				return null;
+			}
+			return viaBlocks.getExtraDataForSingleBlock(world, position.x, position.y, position.z);
+		});
+	}
+
+	private void handleMultiBlockChange(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise) throws Exception {
+		buf.resetReaderIndex();
+		buf.skipBytes(varIntLen(buf));
+		long chunkSectionPos = buf.readLong();
+		int cx = decodeSectionCoordX(chunkSectionPos);
+		int cz = decodeSectionCoordZ(chunkSectionPos);
+		buf.readBoolean();
+		int count = readVarInt(buf);
+		java.util.List<Long> locs = new java.util.ArrayList<>(count);
+		for (int i = 0; i < count; i++) {
+			BlockChangePosition position = decodeMultiBlockChangePosition(chunkSectionPos, readVarLong(buf));
+			locs.add(viaBlocks.packLocation(position.x, position.y, position.z));
+		}
+
+		resolveViaDataOnRegionThread(ctx, buf, promise, player.getWorld(), cx, cz, () -> viaBlocks.getExtraDataForMultiBlock(player.getWorld(), locs));
+	}
+
+	private void resolveViaDataOnRegionThread(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise,
+											  World world, int chunkX, int chunkZ,
+											  java.util.concurrent.Callable<byte[]> supplier) {
+		ByteBuf retained = buf.retain();
+		SchedulerCompat.runRegion(viaBlocks.plugin.plugin, world, chunkX, chunkZ, () -> {
+			byte[] data = null;
+			try {
+				if (player.isOnline() && isViaActive()) {
+					data = supplier.call();
+				}
+			} catch (Exception ignored) {
+			}
+			final byte[] resolvedData = data;
+
+			ChannelHandlerContext currentCtx = this.ctx != null ? this.ctx : ctx;
+			currentCtx.channel().eventLoop().execute(() -> {
+				try {
+					retained.resetReaderIndex();
+					if (resolvedData != null && resolvedData.length > 0) {
+						writeWithViaOnly(currentCtx, retained, promise, resolvedData);
+					} else {
+						currentCtx.write(retained, promise);
+					}
+				} catch (Exception ignored) {
+				} finally {
+					if (retained.refCnt() > 0) {
+						retained.release();
+					}
+				}
+			});
+		});
+	}
+
+	private void requestViaCache(int cx, int cz, long key) {
+		SchedulerCompat.runRegion(viaBlocks.plugin.plugin, player.getWorld(), cx, cz, () -> {
+			if (!player.isOnline()) {
+				release(key);
+				return;
+			}
+			viaBlocks.cacheChunkWithCallback(player.getWorld(), cx, cz, data -> {
+				QueuedPacket q = queue.get(key);
+				if (q != null) {
+					q.viaData = data;
+					q.viaReady = true;
+					tryRelease(key);
+				}
+			});
+		});
+	}
+
+	private void requestY0Cache(int cx, int cz, long key) {
+		SchedulerCompat.runRegion(viaBlocks.plugin.plugin, player.getWorld(), cx, cz, () -> {
+			if (!player.isOnline()) {
+				release(key);
+				return;
+			}
+			y0.cacheChunkWithCallback(player, cx, cz, data -> {
+				QueuedPacket q = queue.get(key);
+				if (q != null) {
+					q.y0Data = data;
+					q.y0Ready = true;
+					tryRelease(key);
+				}
+			});
+		});
+	}
+
+	private void tryRelease(long key) {
+		QueuedPacket q = queue.get(key);
+		if (q != null && q.viaReady && q.y0Ready) {
+			release(key);
+		}
+	}
+
+	private void release(long key) {
+		QueuedPacket q = queue.remove(key);
+		if (q == null) return;
+
+		if (ctx != null && ctx.channel().isOpen()) {
+			ctx.channel().eventLoop().execute(() -> {
+				try {
+					writeWithData(ctx, q.buf, q.promise, q.viaData, q.y0Data);
+				} catch (Exception e) {
+					if (q.buf.refCnt() > 0) {
+						q.buf.release();
+					}
+				}
+			});
+		} else {
+			if (q.buf.refCnt() > 0) {
+				q.buf.release();
+			}
+		}
+	}
+
+	private void scheduleTimeout(long key) {
+		if (ctx != null) {
+			ctx.channel().eventLoop().schedule(() -> {
+				QueuedPacket q = queue.get(key);
+				if (q != null && System.currentTimeMillis() - q.time >= TIMEOUT_MS) {
+					release(key);
+				}
+			}, TIMEOUT_MS, TimeUnit.MILLISECONDS);
+		}
+	}
+
+	private void writeWithData(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise,
+							   byte[] viaData, byte[] y0Data) throws Exception {
+		boolean hasVia = viaData != null && viaData.length > 0;
+		boolean hasY0 = y0Data != null && y0Data.length > 0;
+
+		if (!hasVia && !hasY0) {
+			ctx.write(buf, promise);
+			return;
+		}
+
+		CompositeByteBuf composite = ctx.alloc().compositeBuffer();
+		composite.addComponent(true, buf);
+
+		if (hasVia) {
+			ByteBuf tail = ctx.alloc().buffer();
+			tail.writeBytes(viaData);
+			composite.addComponent(true, tail);
+		}
+
+		if (hasY0) {
+			ByteBuf tail = ctx.alloc().buffer();
+			tail.writeInt(0x59304348);
+			tail.writeInt(y0Data.length);
+			tail.writeBytes(y0Data);
+			composite.addComponent(true, tail);
+		}
+
+		ctx.write(composite, promise);
+	}
+
+	private void writeWithViaOnly(ChannelHandlerContext ctx, ByteBuf buf, ChannelPromise promise,
+								  byte[] data) throws Exception {
+		ByteBuf tail = ctx.alloc().buffer();
+		tail.writeBytes(data);
+
+		CompositeByteBuf composite = ctx.alloc().compositeBuffer();
+		composite.addComponents(true, buf, tail);
+
+		ctx.write(composite, promise);
+	}
+
+	private long key(int x, int z) {
+		return ((long) x << 32) | (z & 0xFFFFFFFFL);
+	}
+
+	private int readVarInt(ByteBuf buf) {
+		int n = 0;
+		int r = 0;
+		byte b;
+		do {
+			b = buf.readByte();
+			r |= (b & 0x7F) << (7 * n++);
+			if (n > 5) throw new RuntimeException("VarInt too big");
+		} while ((b & 0x80) != 0);
+		return r;
+	}
+
+	private long readVarLong(ByteBuf buf) {
+		long value = 0L;
+		int position = 0;
+		byte currentByte;
+		do {
+			currentByte = buf.readByte();
+			value |= (long) (currentByte & 0x7F) << position;
+			position += 7;
+			if (position > 70) {
+				throw new RuntimeException("VarLong too big");
+			}
+		} while ((currentByte & 0x80) != 0);
+		return value;
+	}
+
+	static BlockChangePosition decodeSingleBlockChangePosition(long value) {
+		int x = decodeSigned((int) (value >> 38), 26);
+		int z = decodeSigned((int) ((value >> 12) & 0x3FFFFFFL), 26);
+		int y = decodeSigned((int) (value & 0xFFFL), 12);
+		return new BlockChangePosition(x, y, z);
+	}
+
+	static BlockChangePosition decodeMultiBlockChangePosition(long sectionPosition, long entry) {
+		int sectionX = decodeSectionCoordX(sectionPosition);
+		int sectionY = decodeSectionCoordY(sectionPosition);
+		int sectionZ = decodeSectionCoordZ(sectionPosition);
+		int localPosition = (int) (entry & 0xFFFL);
+		int x = (sectionX << 4) | ((localPosition >> 8) & 0xF);
+		int z = (sectionZ << 4) | ((localPosition >> 4) & 0xF);
+		int y = (sectionY << 4) | (localPosition & 0xF);
+		return new BlockChangePosition(x, y, z);
+	}
+
+	private static int decodeSectionCoordX(long sectionPosition) {
+		return decodeSigned((int) (sectionPosition >> 42), 22);
+	}
+
+	private static int decodeSectionCoordY(long sectionPosition) {
+		return decodeSigned((int) (sectionPosition & 0xFFFFFL), 20);
+	}
+
+	private static int decodeSectionCoordZ(long sectionPosition) {
+		return decodeSigned((int) ((sectionPosition >> 20) & 0x3FFFFFL), 22);
+	}
+
+	private static int decodeSigned(int value, int bits) {
+		int signBit = 1 << (bits - 1);
+		int fullMask = (1 << bits) - 1;
+		value &= fullMask;
+		return (value ^ signBit) - signBit;
+	}
+
+	private int varIntLen(ByteBuf buf) {
+		int s = buf.readerIndex();
+		readVarInt(buf);
+		int l = buf.readerIndex() - s;
+		buf.readerIndex(s);
+		return l;
+	}
+
+	public void forceClearQueue() {
+		for (QueuedPacket q : queue.values()) {
+			if (q.buf.refCnt() > 0) {
+				q.buf.release();
+			}
+
+			if (!q.promise.isDone()) {
+				q.promise.tryFailure(new RuntimeException("Force cleared queued chunk packet"));
+			}
+		}
+
+		queue.clear();
+	}
+
+	public void clearOldQueuePackets(long maxAgeMs) {
+		long now = System.currentTimeMillis();
+
+		for (Map.Entry<Long, QueuedPacket> entry : queue.entrySet()) {
+			QueuedPacket q = entry.getValue();
+
+			if (now - q.time >= maxAgeMs && queue.remove(entry.getKey(), q)) {
+				if (q.buf.refCnt() > 0) {
+					q.buf.release();
+				}
+
+				if (!q.promise.isDone()) {
+					q.promise.tryFailure(new RuntimeException("Expired queued chunk packet"));
+				}
+			}
+		}
+	}
+
+	@Override
+	public void handlerRemoved(ChannelHandlerContext ctx) {
+		for (QueuedPacket q : queue.values()) {
+			if (q.buf.refCnt() > 0) {
+				q.buf.release();
+			}
+		}
+		queue.clear();
+	}
+}

src/main/java/tf/tuff/netty/ChunkInjector.java

@@ -0,0 +1,64 @@
+package tf.tuff.netty;
+
+import com.viaversion.viaversion.api.Via;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandler;
+import org.bukkit.entity.Player;
+import tf.tuff.viablocks.CustomBlockListener;
+import tf.tuff.y0.Y0Plugin;
+
+import java.util.UUID;
+
+public class ChunkInjector extends BaseInjector {
+
+	private final CustomBlockListener viaBlocks;
+	private final Y0Plugin y0;
+
+	public ChunkInjector(CustomBlockListener viaBlocks, Y0Plugin y0) {
+		super("tuff_chunk_handler");
+		this.viaBlocks = viaBlocks;
+		this.y0 = y0;
+	}
+
+	@Override
+	protected ChannelHandler createHandler(Player player) {
+		return new ChunkHandler(viaBlocks, y0, player);
+	}
+
+	@Override
+	public void inject(Player player) {
+		UUID uuid = player.getUniqueId();
+		var viaConnection = Via.getAPI().getConnection(uuid);
+		if (viaConnection == null) return;
+
+		Channel channel = viaConnection.getChannel();
+		if (channel == null) return;
+
+		channel.eventLoop().submit(() -> {
+			try {
+				if (channel.pipeline().get("tuff_chunk_handler") != null) {
+					channel.pipeline().remove("tuff_chunk_handler");
+				}
+				if (channel.pipeline().get("viablocks_chunk_handler") != null) {
+					channel.pipeline().remove("viablocks_chunk_handler");
+				}
+				if (channel.pipeline().get("y0_chunk_handler") != null) {
+					channel.pipeline().remove("y0_chunk_handler");
+				}
+
+				if (channel.pipeline().get("via-encoder") != null) {
+					channel.pipeline().addBefore(
+						"via-encoder",
+						"tuff_chunk_handler",
+						new ChunkHandler(viaBlocks, y0, player)
+					);
+				} else {
+					channel.pipeline().addFirst("tuff_chunk_handler",
+						new ChunkHandler(viaBlocks, y0, player));
+				}
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		});
+	}
+}

src/main/java/tf/tuff/tuffactions/TuffActionBase.java

@@ -0,0 +1,57 @@
+package tf.tuff.tuffactions;
+
+import java.util.logging.Level;
+
+import tf.tuff.TuffX;
+
+public abstract class TuffActionBase {
+
+	private boolean enabled = false;
+	private boolean debugMode = false;
+
+	private final String name;
+	private final String configPath;
+
+	protected final TuffActions actsPlugin;
+	protected final TuffX plugin;
+
+	public TuffActionBase(TuffActions actsPlugin, String name, String configPath, boolean defaultEnabled) {
+		this.actsPlugin = actsPlugin;
+		this.plugin = actsPlugin.plugin;
+		this.name = name;
+		this.configPath = configPath;
+		plugin.getConfig().addDefault(configPath+".enabled", defaultEnabled);
+		plugin.getConfig().addDefault(configPath+".debug", false);
+	}
+
+	public boolean isEnabled() {
+		return enabled;
+	}
+
+	public void onConfigLoad() {
+		boolean wasEnabled = this.enabled;
+		this.enabled = plugin.getConfig().getBoolean(this.configPath+".enabled");
+		if (enabled) {
+			this.enable(wasEnabled);
+		} else if (wasEnabled) {
+			this.disable();
+		}
+		this.debugMode = plugin.getConfig().getBoolean(this.configPath+".debug");
+	}
+	protected void enable(boolean wasEnabled) {
+		actsPlugin.info(name+" enabled.");
+	}
+	protected void disable() {
+		actsPlugin.info(name+" is now disabled.");
+	}
+
+	protected boolean isDebug() {
+		return debugMode;
+	}
+	protected void debug(String msg) {
+		if (debugMode) actsPlugin.log(Level.INFO, msg);
+	}
+	protected void debug(String msg, Exception e) {
+		if (debugMode) actsPlugin.log(Level.INFO, msg, e);
+	}
+}

src/main/java/tf/tuff/tuffactions/TuffActions.java

@@ -0,0 +1,159 @@
+package tf.tuff.tuffactions;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
+
+import org.bukkit.GameMode;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.EntityToggleSwimEvent;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerPluginMessage;
+
+import tf.tuff.TuffX;
+import tf.tuff.tuffactions.creative.CreativeMenu;
+import tf.tuff.tuffactions.restrictions.Restrictions;
+import tf.tuff.tuffactions.swimming.Swimming;
+
+public class TuffActions {
+
+	public static final String CHANNEL = "eagler:tuffactions";
+
+	private Swimming swimmingManager;
+	private CreativeMenu creativeManager;
+	private Restrictions restrictions;
+	
+	public final TuffX plugin;
+
+	public static final Set<UUID> tuffPlayers = ConcurrentHashMap.newKeySet();
+
+	public TuffActions(TuffX plugin){
+		this.plugin = plugin;
+	}
+
+	private void loadConfig() {
+		info("TuffActions has been enabled");
+		info("Enabling features...");
+
+		swimmingManager.onConfigLoad();
+		creativeManager.onConfigLoad();
+		restrictions.onConfigLoad();
+	}
+
+	public void onTuffXReload() {
+		loadConfig();
+
+		info("Misc features reloaded.");
+	}
+
+	public void onTuffXEnable() {
+		this.swimmingManager = new Swimming(this);
+		this.creativeManager = new CreativeMenu(this);
+		this.restrictions = new Restrictions(this);
+
+		plugin.getConfig().options().copyDefaults(true);
+		loadConfig();
+		info("Finished enabling features.");
+
+		plugin.getServer().getMessenger().registerOutgoingPluginChannel(plugin, "eagler:tuffactions");
+		plugin.getServer().getMessenger().registerIncomingPluginChannel(plugin, "eagler:tuffactions", plugin);
+	}
+
+	public boolean onTuffXCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (command.getName().equalsIgnoreCase("restrictions")) return this.restrictions.onTuffXCommand(sender, command, label, args);
+		return true;
+	}
+
+	public void handlePacket(Player player, byte[] message) {
+		if (player == null || message == null || message.length < 13) return;
+		try (DataInputStream in = new DataInputStream(new ByteArrayInputStream(message))) {
+			in.readInt();
+			in.readInt();
+			in.readInt();
+			int actionLength = in.readUnsignedByte();
+			if (actionLength == 0 || in.available() < actionLength) return;
+			byte[] actionBytes = new byte[actionLength];
+			in.readFully(actionBytes);
+			String action = new String(actionBytes, StandardCharsets.UTF_8);
+
+			tuffPlayers.add(player.getUniqueId());
+
+			if ("swimming_state".equals(action)) {
+				swimmingManager.handleSwimState(player, in.readBoolean());
+			} else if ("elytra_state".equals(action)) {
+				swimmingManager.handleElytraState(player, in.readBoolean());
+			} else if ("swim_ready".equals(action)){
+				swimmingManager.handleSwimReady(player);
+			} else if ("creative_ready".equals(action)){
+				creativeManager.handleCreativeReady(player);
+			} else if ("give_creative_item".equals(action)){
+				if (!creativeManager.isEnabled()) return;
+				if (player.getGameMode() != GameMode.CREATIVE) return;
+				int itemLength = in.readUnsignedByte();
+				if (in.available() < itemLength + Integer.BYTES) return;
+				byte[] itemBytes = new byte[itemLength];
+				in.readFully(itemBytes);
+				String item = new String(itemBytes, StandardCharsets.UTF_8);
+				int amount = in.readInt();
+				creativeManager.handlePlaceholderTaken(player, item, amount);
+			} else if ("pick_viablock".equals(action)){
+				if (!creativeManager.isEnabled()) return;
+				if (player.getGameMode() != GameMode.CREATIVE) return;
+				int blockLength = in.readUnsignedByte();
+				if (in.available() < blockLength + 1) return;
+				byte[] blockBytes = new byte[blockLength];
+				in.readFully(blockBytes);
+				String blockName = new String(blockBytes, StandardCharsets.UTF_8);
+				int hotbarSlot = in.readUnsignedByte();
+				creativeManager.handlePickViablock(player, blockName, hotbarSlot);
+			} else if ("restrictions_ready".equals(action)) {
+				restrictions.handleRestrictionsReady(player);
+			}
+		} catch (IOException e) {
+			log(Level.WARNING, "Failed to read a plugin message from " + player.getName(), e);
+		}
+	}
+
+	public void sendPluginMessage(Player player, byte[] payload) {
+		sendPluginMessage(player, CHANNEL, payload);
+	}
+
+	public void sendPluginMessage(Player player, String channel, byte[] payload) {
+		if (player == null || payload == null || !player.isOnline() || PacketEvents.getAPI() == null || !PacketEvents.getAPI().isInitialized()) return;
+		WrapperPlayServerPluginMessage packet = new WrapperPlayServerPluginMessage(channel, payload);
+		PacketEvents.getAPI().getPlayerManager().sendPacket(player, packet);
+	}
+
+	public void handlePlayerQuit(PlayerQuitEvent event) {
+		swimmingManager.handlePlayerQuit(event);
+		tuffPlayers.remove(event.getPlayer().getUniqueId());
+	}
+
+	public void handleToggleSwim(EntityToggleSwimEvent event) {
+		swimmingManager.handleToggleSwim(event);
+	}
+
+	public void handlePlayerInventoryClick(InventoryClickEvent event) {
+		creativeManager.onPlayerInventoryClick(event);
+	}
+
+	public void log(Level level, String msg, Throwable e) {
+		plugin.getLogger().log(level, "[TuffActions] "+msg, e);
+	}
+	public void log(Level level, String msg) {
+		plugin.getLogger().log(level, "[TuffActions] "+msg);
+	}
+	public void info(String msg) {
+		log(Level.INFO, msg);
+	}
+}

src/main/java/tf/tuff/tuffactions/creative/CreativeMenu.java

@@ -0,0 +1,115 @@
+package tf.tuff.tuffactions.creative;
+
+import tf.tuff.tuffactions.TuffActionBase;
+import tf.tuff.tuffactions.TuffActions;
+
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.ItemStack;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+import tf.tuff.util.SchedulerCompat;
+
+public class CreativeMenu extends TuffActionBase {
+	private final Set<String> itemMapping = ConcurrentHashMap.newKeySet();
+	private final Map<UUID, ItemStack> playerHoldingPlaceholder = new ConcurrentHashMap<>();
+
+	private final TabUtil tabUtil;
+
+	public CreativeMenu(TuffActions actsPlugin) {
+		super(actsPlugin, "Creative Items", "creative-items", true);
+		this.tabUtil = new TabUtil(actsPlugin);
+	}
+
+	@Override
+	protected void enable(boolean wasEnabled) {
+		if (!wasEnabled) {
+			if (itemMapping.isEmpty()) initializeMappings();
+		}
+		super.enable(wasEnabled);
+	}
+	@Override
+	protected void disable() {
+		itemMapping.clear();
+		super.disable();
+	}
+
+	public void initializeMappings() {
+		for (Material m : Material.values()){
+			if (m.isItem()){
+				itemMapping.add(m.name());
+			}
+		}
+	}
+
+	/*** CUSTOM SERVER-BOUND PACKETS ***/
+	public void handleCreativeReady(Player player) {
+		if (!isEnabled()) return;
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("creative_items");
+			out.writeInt(itemMapping.size());
+
+			for (String item : itemMapping) {
+				out.writeUTF(item);
+				String category = this.tabUtil.getCreativeCategory(item);
+				out.writeUTF(category != null ? category : "");
+			}
+
+			actsPlugin.sendPluginMessage(player, bout.toByteArray());
+		} catch (IOException e) {
+			debug("Failed to send creative items to " + player.getName(), e);
+		}
+	}
+
+	public void handlePlaceholderTaken(Player player, String realItemName, int amount) {
+		Material realMaterial = Material.getMaterial(realItemName.toUpperCase(Locale.ROOT));
+		if (realMaterial != null) {
+			ItemStack realItemStack = new ItemStack(realMaterial, amount);
+			playerHoldingPlaceholder.put(player.getUniqueId(), realItemStack);
+		}
+	}
+
+	public void handlePickViablock(Player player, String blockName, int hotbarSlot) {
+		Material material = Material.getMaterial(blockName.toUpperCase(Locale.ROOT));
+		if (material == null || !material.isItem()) {
+			return;
+		}
+		if (hotbarSlot < 0 || hotbarSlot > 8) {
+			hotbarSlot = 0;
+		}
+		player.getInventory().setItem(hotbarSlot, new ItemStack(material, 1));
+	}
+
+	/*** EVENT HANDLERS ***/
+	public void onPlayerInventoryClick(InventoryClickEvent event) {
+		if (!isEnabled()) return;
+		Player player = (Player) event.getWhoClicked();
+		UUID playerUUID = player.getUniqueId();
+
+		if (playerHoldingPlaceholder.containsKey(playerUUID)) {
+			InventoryAction action = event.getAction();
+			if (action == InventoryAction.PLACE_ALL || action == InventoryAction.PLACE_ONE || action == InventoryAction.SWAP_WITH_CURSOR) {
+
+				SchedulerCompat.runEntityLater(player, plugin, () -> {
+					ItemStack realItemStack = playerHoldingPlaceholder.get(playerUUID);
+
+					if (realItemStack != null && event.getClickedInventory() != null) {
+						event.getClickedInventory().setItem(event.getSlot(), realItemStack);
+					}
+
+					playerHoldingPlaceholder.remove(playerUUID);
+				}, 1L);
+			}
+		}
+	}
+}

src/main/java/tf/tuff/tuffactions/creative/TabUtil.java

@@ -0,0 +1,58 @@
+package tf.tuff.tuffactions.creative;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+import java.util.logging.Level;
+import javax.annotation.Nullable;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import tf.tuff.tuffactions.TuffActions;
+
+public class TabUtil {
+	private final TuffActions plugin;
+	private final File mappingFile;
+	private Map<String, String> creativeTabMap;
+
+	public TabUtil(TuffActions plugin) {
+		this.plugin = plugin;
+		this.mappingFile = new File(plugin.plugin.getDataFolder(), "tab-mapping.json");
+
+		setupMappingFile();
+		
+		loadMapping();
+	}
+
+	private void setupMappingFile() {
+		if (!mappingFile.exists()) {
+			plugin.info("Creative tab mapping not found, creating from resources...");
+			plugin.plugin.saveResource("tab-mapping.json", false);
+		}
+	}
+
+	private void loadMapping() {
+		try {
+			ObjectMapper mapper = new ObjectMapper();
+			
+			TypeReference<Map<String, String>> typeRef = new TypeReference<Map<String, String>>() {};
+			
+			this.creativeTabMap = mapper.readValue(mappingFile, typeRef);
+			plugin.info("Successfully loaded " + creativeTabMap.size() + " creative tab mappings.");
+
+		} catch (IOException e) {
+			plugin.log(Level.SEVERE, "Failed to load creative tab mapping from file!", e);
+			this.creativeTabMap = Collections.emptyMap();
+		}
+	}
+
+	@Nullable
+	public String getCreativeCategory(String material) {
+		if (material == null || creativeTabMap.isEmpty()) {
+			return null;
+		}
+		return creativeTabMap.get(material);
+	}
+}

src/main/java/tf/tuff/tuffactions/restrictions/Restrictions.java

@@ -0,0 +1,102 @@
+package tf.tuff.tuffactions.restrictions;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import tf.tuff.tuffactions.TuffActionBase;
+import tf.tuff.tuffactions.TuffActions;
+
+public class Restrictions extends TuffActionBase {
+	private RestrictionsCommand commandHandler;
+	private Set<String> disallowed = ConcurrentHashMap.newKeySet();
+
+	private static final List<String> example = List.of("clientbrand");
+
+	public Restrictions(TuffActions actsPlugin) {
+		super(actsPlugin, "Restrictions", "restrictions", true);
+		this.commandHandler = new RestrictionsCommand(this, plugin);
+		plugin.getConfig().addDefault("restrictions.disallow", example);
+	}
+
+	public void loadConfig() {
+		disallowed.clear();
+		actsPlugin.info("Loading Restrictions config...");
+		List<?> config = plugin.getConfig().getList("restrictions.disallow");
+		for (Object val : config) {
+			if (val instanceof String) disallowed.add((String)val);
+		}
+	}
+
+	@Override
+	protected void enable(boolean wasEnabled) {
+		loadConfig();
+		super.enable(wasEnabled);
+	}
+	@Override
+	protected void disable() {
+		disallowed.clear();
+		super.disable();
+	}
+
+	/*** CUSTOM SERVER-BOUND PACKETS ***/
+	public void handleRestrictionsReady(Player player) {
+		if (!isEnabled()) return;
+		debug("Sending restrictions to %s".formatted(player.getName()));
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("client_features_all");
+			out.writeInt(disallowed.size());
+
+			for (String key : disallowed) {
+				out.writeUTF(key);
+				out.writeBoolean(false);
+			}
+
+			actsPlugin.sendPluginMessage(player, bout.toByteArray());
+		} catch (IOException e) {
+			debug("Failed to send Restrictions to " + player.getName(), e);
+		}
+	}
+
+	/*** CUSTOM CLIENT-BOUND PACKETS ***/
+	public void sendSingleUpdateToAll(String key) {
+		for (UUID uuid : TuffActions.tuffPlayers) {
+			Player player = Bukkit.getPlayer(uuid);
+			handleSingleUpdate(player, key);
+		}
+	}
+
+	private void handleSingleUpdate(Player player, String key) {
+		if (!isEnabled()) return;
+		debug("Sending restriction update for '%s' to %s".formatted(key, player.getName()));
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("client_feature");
+			out.writeUTF(key);
+			out.writeBoolean(!disallowed.contains(key));
+
+			actsPlugin.sendPluginMessage(player, bout.toByteArray());
+		} catch (IOException e) {
+			actsPlugin.log(Level.WARNING, "Failed to send Restriction "+key+" to " + player.getName(), e);
+		}
+	}
+
+	/*** COMMANDS ***/
+	public boolean onTuffXCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (!isEnabled()) {
+			sender.sendMessage("Restrictions are currently disabled.");
+			return true;
+		}
+		return commandHandler.onCommand(sender, command, label, args);
+	}
+
+}

src/main/java/tf/tuff/tuffactions/restrictions/RestrictionsCommand.java

@@ -0,0 +1,74 @@
+package tf.tuff.tuffactions.restrictions;
+
+import java.util.List;
+import java.util.logging.Level;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+
+import tf.tuff.TuffX;
+
+public class RestrictionsCommand {
+	private final TuffX tuffx;
+	private final Restrictions restrictions;
+
+	RestrictionsCommand(Restrictions restrictions, TuffX tuffx) {
+		this.restrictions = restrictions;
+		this.tuffx = tuffx;
+	}
+	
+	private boolean error(CommandSender sender, String msg) {
+		sender.sendMessage("\u00A7c%s".formatted(msg));
+		return true;
+	}
+	private boolean noPermission(CommandSender sender) {
+		return error(sender, "You do not have permission to use this command.");
+	}
+	private boolean invalidUsage(CommandSender sender, String msg) {
+		return error(sender, "Invalid usage. %s Use: /restrictions <allow|disallow> <module>".formatted(msg));
+	}
+	private boolean unknownError(CommandSender sender, Exception e) {
+		tuffx.getLogger().log(Level.SEVERE, "An unknown error occurred while executing a restrictions command", e);
+		return error(sender, "An unknown error has occurred. Check server logs.");
+	}
+
+	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (args.length == 0) return invalidUsage(sender, "'allow' or 'disallow' required.");
+
+		if (args[0].equalsIgnoreCase("disallow")) {
+			if (!sender.hasPermission("tuffx.restrictions.command.disallow")) return noPermission(sender);
+			if (args.length < 2) return invalidUsage(sender, "Module name required.");
+			try {
+				@SuppressWarnings("unchecked")
+				List<String> config = (List<String>)tuffx.getConfig().getList("restrictions.disallow");
+				config.add(args[1]);
+				tuffx.getConfig().set("restrictions.disallow", config);
+				tuffx.saveConfig();
+				restrictions.loadConfig();
+				restrictions.sendSingleUpdateToAll(args[1]);
+			} catch(Exception e) {
+				return unknownError(sender, e);
+			}
+			sender.sendMessage("\u00A7aModule '%s' added to disallow list.".formatted(args[1]));
+			return true;
+		} else if (args[0].equalsIgnoreCase("allow")) {
+			if (!sender.hasPermission("tuffx.restrictions.command.allow")) return noPermission(sender);
+			if (args.length < 2) return invalidUsage(sender, "Module name required.");
+			try {
+				@SuppressWarnings("unchecked")
+				List<String> config = (List<String>)tuffx.getConfig().getList("restrictions.disallow");
+				if (!config.contains(args[1])) return error(sender, "Module '%s' not in disallow list. No change.".formatted(args[1]));
+				config.remove(args[1]);
+				tuffx.getConfig().set("restrictions.disallow", config);
+				tuffx.saveConfig();
+				restrictions.loadConfig();
+				restrictions.sendSingleUpdateToAll(args[1]);
+			} catch(Exception e) {
+				return unknownError(sender, e);
+			}
+			sender.sendMessage("\u00A7aModule '%s' removed from disallow list.".formatted(args[1]));
+			return true;
+		}
+		return invalidUsage(sender, "Unknown option.");
+	}
+}

src/main/java/tf/tuff/tuffactions/swimming/Swimming.java

@@ -0,0 +1,166 @@
+package tf.tuff.tuffactions.swimming;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.EntityToggleSwimEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.inventory.ItemStack;
+
+import io.github.retrooper.packetevents.util.folia.TaskWrapper;
+import tf.tuff.tuffactions.TuffActionBase;
+import tf.tuff.tuffactions.TuffActions;
+import tf.tuff.util.SchedulerCompat;
+
+public class Swimming extends TuffActionBase {
+
+	private final Set<UUID> swimmingPlayers = ConcurrentHashMap.newKeySet();
+	private final Map<UUID, TaskWrapper> swimStateTasks = new ConcurrentHashMap<>();
+
+	public Swimming(TuffActions plugin) {
+		super(plugin, "Swimming", "swimming", true);
+	}
+
+	@Override
+	protected void disable() {
+		for (TaskWrapper task : swimStateTasks.values()) {
+			task.cancel();
+		}
+		swimStateTasks.clear();
+		swimmingPlayers.clear();
+		super.disable();
+	}
+
+	/*** CUSTOM, SERVER-BOUND PACKETS ***/
+	public void handleSwimReady(Player player) {
+		if (!isEnabled()) return;
+		SchedulerCompat.runEntityLater(player, plugin, () -> {
+			for (UUID swimmingPlayerId : swimmingPlayers) {
+				Player swimmingPlayer = Bukkit.getPlayer(swimmingPlayerId);
+				if (swimmingPlayer != null && swimmingPlayer.isOnline() && player.canSee(swimmingPlayer)) {
+					sendSwimState(player, swimmingPlayer, true);
+				}
+			}
+		}, 20L);
+	}
+
+	public void handleSwimState(Player player, boolean isSwimming) {
+		if (!isEnabled()) return;
+		if (isSwimming) {
+			swimmingPlayers.add(player.getUniqueId());
+			startSwimMaintenance(player);
+		} else {
+			swimmingPlayers.remove(player.getUniqueId());
+			stopSwimMaintenance(player.getUniqueId());
+		}
+		SchedulerCompat.runEntity(player, plugin, () -> applySwimmingState(player, isSwimming));
+		broadcastSwimState(player, isSwimming);
+	}
+
+	public void handleElytraState(Player player, boolean isGliding) {
+		if (!isEnabled()) return;
+		SchedulerCompat.runEntity(player, plugin, () -> {
+			ItemStack chest = player.getInventory().getChestplate();
+			if (chest != null && chest.getType() == Material.ELYTRA) player.setGliding(isGliding);
+		});
+	}
+
+	/*** EVENT HANDLERS ***/
+	public void handleToggleSwim(EntityToggleSwimEvent event) {
+		if (!isEnabled()) return;
+		if (!(event.getEntity() instanceof Player)) return;
+		Player player = (Player) event.getEntity();
+		if (!event.isSwimming() && swimmingPlayers.contains(player.getUniqueId())) {
+			event.setCancelled(true);
+			SchedulerCompat.runEntity(player, plugin, () -> {
+				if (swimmingPlayers.contains(player.getUniqueId()) && player.isOnline()) {
+					applySwimmingState(player, true);
+				}
+			});
+		}
+	}
+
+	public void handlePlayerQuit(PlayerQuitEvent event) {
+		if (!isEnabled()) return;
+		Player player = event.getPlayer();
+		stopSwimMaintenance(player.getUniqueId());
+		if (swimmingPlayers.remove(player.getUniqueId())) {
+			broadcastSwimState(player, false);
+		}
+	}
+
+	/*** CUSTOM CLIENT-BOUND PACKETS ***/
+	private void broadcastSwimState(Player subject, boolean isSwimming) {
+		for (UUID otherUUID : TuffActions.tuffPlayers) {
+			if (!otherUUID.equals(subject.getUniqueId())) {
+				Player recipient = Bukkit.getPlayer(otherUUID);
+				if (recipient != null && recipient.isOnline()) {
+					SchedulerCompat.runEntity(recipient, plugin, () -> {
+						if (recipient.isOnline() && recipient.canSee(subject)) {
+							sendSwimState(recipient, subject, isSwimming);
+						}
+					});
+				}
+			}
+		}
+	}
+
+	private void sendSwimState(Player recipient, Player subject, boolean isSwimming) {
+		if (recipient == null || !recipient.isOnline()) return;
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("update_other_swim");
+
+			out.writeLong(subject.getUniqueId().getMostSignificantBits());
+			out.writeLong(subject.getUniqueId().getLeastSignificantBits());
+			out.writeBoolean(isSwimming);
+
+			actsPlugin.sendPluginMessage(recipient, bout.toByteArray());
+		} catch (IOException e) {
+			debug("Failed to send swim state to " + recipient.getName(), e);
+		}
+	}
+
+	private void maintainSwimmingState(Player player) {
+		if (!player.isOnline()) {
+			stopSwimMaintenance(player.getUniqueId());
+			swimmingPlayers.remove(player.getUniqueId());
+			return;
+		}
+		if (!player.isInWater()) {
+			stopSwimMaintenance(player.getUniqueId());
+			swimmingPlayers.remove(player.getUniqueId());
+			applySwimmingState(player, false);
+			broadcastSwimState(player, false);
+			return;
+		}
+		applySwimmingState(player, true);
+	}
+
+	private void applySwimmingState(Player player, boolean swimming) {
+		if (player == null || !player.isOnline()) return;
+		if (swimming && !player.isInWater()) return;
+		if (player.isSwimming() != swimming) {
+			player.setSwimming(swimming);
+		}
+	}
+
+	private void startSwimMaintenance(Player player) {
+		swimStateTasks.computeIfAbsent(player.getUniqueId(),
+			ignored -> SchedulerCompat.runEntityTimer(player, plugin, () -> maintainSwimmingState(player), 1L, 1L));
+	}
+
+	private void stopSwimMaintenance(UUID playerId) {
+		TaskWrapper task = swimStateTasks.remove(playerId);
+		if (task != null) {
+			task.cancel();
+		}
+	}
+}

src/main/java/tf/tuff/util/SchedulerCompat.java

@@ -0,0 +1,82 @@
+package tf.tuff.util;
+
+import java.util.concurrent.TimeUnit;
+
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+import io.github.retrooper.packetevents.util.folia.FoliaScheduler;
+import io.github.retrooper.packetevents.util.folia.TaskWrapper;
+
+public final class SchedulerCompat {
+
+	private SchedulerCompat() {
+	}
+
+	public static boolean isFolia() {
+		return FoliaScheduler.isFolia();
+	}
+
+	public static void runGlobal(Plugin plugin, Runnable task) {
+		FoliaScheduler.getGlobalRegionScheduler().execute(plugin, task);
+	}
+
+	public static TaskWrapper runGlobalLater(Plugin plugin, Runnable task, long delayTicks) {
+		return FoliaScheduler.getGlobalRegionScheduler().runDelayed(plugin, scheduledTask -> task.run(), delayTicks);
+	}
+
+	public static TaskWrapper runGlobalTimer(Plugin plugin, Runnable task, long delayTicks, long periodTicks) {
+		return FoliaScheduler.getGlobalRegionScheduler().runAtFixedRate(plugin, scheduledTask -> task.run(), delayTicks, periodTicks);
+	}
+
+	public static void runAsync(Plugin plugin, Runnable task) {
+		FoliaScheduler.getAsyncScheduler().runNow(plugin, scheduledTask -> task.run());
+	}
+
+	public static TaskWrapper runAsyncLater(Plugin plugin, Runnable task, long delayTicks) {
+		return FoliaScheduler.getAsyncScheduler().runDelayed(plugin, scheduledTask -> task.run(), delayTicks * 50L, TimeUnit.MILLISECONDS);
+	}
+
+	public static void runRegion(Plugin plugin, World world, int chunkX, int chunkZ, Runnable task) {
+		FoliaScheduler.getRegionScheduler().execute(plugin, world, chunkX, chunkZ, task);
+	}
+
+	public static TaskWrapper runRegionLater(Plugin plugin, World world, int chunkX, int chunkZ, Runnable task, long delayTicks) {
+		return FoliaScheduler.getRegionScheduler().runDelayed(plugin, world, chunkX, chunkZ, scheduledTask -> task.run(), delayTicks);
+	}
+
+	public static void runRegion(Plugin plugin, Location location, Runnable task) {
+		FoliaScheduler.getRegionScheduler().execute(plugin, location, task);
+	}
+
+	public static TaskWrapper runRegionLater(Plugin plugin, Location location, Runnable task, long delayTicks) {
+		return FoliaScheduler.getRegionScheduler().runDelayed(plugin, location, scheduledTask -> task.run(), delayTicks);
+	}
+
+	public static void runEntity(Entity entity, Plugin plugin, Runnable task) {
+		FoliaScheduler.getEntityScheduler().execute(entity, plugin, task, () -> {
+		}, 0L);
+	}
+
+	public static TaskWrapper runEntityLater(Entity entity, Plugin plugin, Runnable task, long delayTicks) {
+		return FoliaScheduler.getEntityScheduler().runDelayed(entity, plugin, scheduledTask -> task.run(), () -> {
+		}, delayTicks);
+	}
+
+	public static TaskWrapper runEntityTimer(Entity entity, Plugin plugin, Runnable task, long delayTicks, long periodTicks) {
+		return FoliaScheduler.getEntityScheduler().runAtFixedRate(entity, plugin, scheduledTask -> task.run(), () -> {
+		}, delayTicks, periodTicks);
+	}
+
+	public static void sendPluginMessage(Plugin plugin, Player player, String channel, byte[] payload) {
+		if (player == null || channel == null || payload == null || !player.isOnline()) return;
+		runEntity(player, plugin, () -> {
+			if (player.isOnline()) {
+				player.sendPluginMessage(plugin, channel, payload);
+			}
+		});
+	}
+}

src/main/java/tf/tuff/viablocks/CustomBlockListener.java

@@ -0,0 +1,678 @@
+package tf.tuff.viablocks;
+
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Consumer;
+import javax.annotation.Nonnull;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Chunk;
+import org.bukkit.ChunkSnapshot;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.data.type.Door;
+import org.bukkit.block.data.Bisected;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.entity.Player;
+import org.bukkit.event.block.*;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.world.ChunkLoadEvent;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.io.ByteArrayDataOutput;
+import com.google.common.io.ByteStreams;
+
+import tf.tuff.netty.ChunkInjector;
+import tf.tuff.util.SchedulerCompat;
+import tf.tuff.viablocks.version.VersionAdapter;
+
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import it.unimi.dsi.fastutil.longs.LongList;
+
+public class CustomBlockListener {
+
+	public final ViaBlocksPlugin plugin;
+	private final VersionAdapter versionAdapter;
+	private final PaletteManager paletteManager;
+	private final EnumSet<Material> modernMaterials;
+	private ChunkInjector chunkInjector;
+	private static final long X_MASK = (1L << 26) - 1L;
+	private static final long Z_MASK = (1L << 26) - 1L;
+	private static final long Y_MASK = (1L << 12) - 1L;
+	private static final int Z_SHIFT = 12;
+	private static final int X_SHIFT = 12 + 26;
+	private final Map<UUID, Map<Integer, List<Long>>> pendingUpdates = new HashMap<>();
+	private final Set<UUID> pendingFlush = new HashSet<>();
+	private static final double UPDATE_RADIUS_SQUARED = 6400;
+	private static final @Nonnull byte[] EMPTY_PACKET = new byte[0];
+
+	private final Cache<BlockData, Integer> blockDataIdCache;
+	private final Cache<String, byte[]> chunkPacketCache;
+
+	private final Cache<Long, Integer> recentModernChanges;
+
+	public CustomBlockListener(ViaBlocksPlugin plugin, VersionAdapter versionAdapter, PaletteManager paletteManager) {
+		this.plugin = plugin;
+		this.versionAdapter = versionAdapter;
+		this.paletteManager = paletteManager;
+		this.modernMaterials = versionAdapter.getModernMaterials();
+		this.blockDataIdCache = CacheBuilder.newBuilder()
+			.maximumSize(8000)
+			.expireAfterAccess(10, TimeUnit.MINUTES)
+			.build();
+		this.chunkPacketCache = CacheBuilder.newBuilder()
+			.maximumSize(4096)
+			.expireAfterAccess(5, TimeUnit.MINUTES)
+			.build();
+		this.recentModernChanges = CacheBuilder.newBuilder()
+			.maximumSize(10000)
+			.expireAfterWrite(5, TimeUnit.MINUTES)
+			.build();
+	}
+
+	public byte[] getCachedChunkData(String worldName, int x, int z) {
+		return chunkPacketCache.getIfPresent(chunkKey(worldName, x, z));
+	}
+
+	public void setChunkInjector(ChunkInjector injector) {
+		if (injector == null) return;
+		this.chunkInjector = injector;
+	}
+
+	private @Nonnull String chunkKey(String worldName, int x, int z) {
+		return worldName + "_" + x + "_" + z;
+	}
+
+	public void onViaBlocksPlayerJoin(Player player) {
+		if (plugin.isFirstJoin(player)) {
+			plugin.sendWelcomeGui(player);
+			plugin.markPlayerAsJoined(player);
+		}
+		sendPaletteToClient(player);
+
+		preCacheVisibleChunks(player);
+		if (chunkInjector != null) {
+			chunkInjector.inject(player);
+		}
+		sendInitialChunks(player);
+	}
+
+	private void preCacheVisibleChunks(Player player) {
+		World world = player.getWorld();
+		int viewDistance = Math.min(this.versionAdapter.getClientViewDistance(player), 16);
+		int px = player.getLocation().getChunk().getX();
+		int pz = player.getLocation().getChunk().getZ();
+
+		for (int x = -viewDistance; x <= viewDistance; x++) {
+			for (int z = -viewDistance; z <= viewDistance; z++) {
+				int cx = px + x;
+				int cz = pz + z;
+
+				if (world.isChunkLoaded(cx, cz)) {
+					Chunk chunk = world.getChunkAt(cx, cz);
+					prepareChunkCache(chunk);
+				}
+			}
+		}
+	}
+
+	private static final int CHUNKS_PER_TICK = 8;
+
+	private void sendInitialChunks(Player player) {
+		World world = player.getWorld();
+		int viewDistance = Math.min(this.versionAdapter.getClientViewDistance(player), 16);
+		int px = player.getLocation().getChunk().getX();
+		int pz = player.getLocation().getChunk().getZ();
+
+		List<int[]> chunks = new ArrayList<>();
+		for (int x = -viewDistance; x <= viewDistance; x++) {
+			for (int z = -viewDistance; z <= viewDistance; z++) {
+				int cx = px + x;
+				int cz = pz + z;
+				if (world.isChunkLoaded(cx, cz)) {
+					chunks.add(new int[]{cx, cz, x * x + z * z});
+				}
+			}
+		}
+
+		chunks.sort((a, b) -> Integer.compare(a[2], b[2]));
+
+		sendChunksBatched(player, world.getName(), chunks, 0);
+	}
+
+	private void sendChunksBatched(Player player, String worldName, List<int[]> chunks, int startIndex) {
+		if (!player.isOnline() || startIndex >= chunks.size()) return;
+
+		int endIndex = Math.min(startIndex + CHUNKS_PER_TICK, chunks.size());
+		for (int i = startIndex; i < endIndex; i++) {
+			int[] chunk = chunks.get(i);
+			World world = player.getWorld();
+			if (!world.getName().equals(worldName)) {
+				return;
+			}
+			cacheChunkWithCallback(world, chunk[0], chunk[1], data -> {
+				if (!player.isOnline() || !plugin.isPlayerEnabled(player)) return;
+				if (data != null && data.length > 0) {
+					SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaBlocksPlugin.CLIENTBOUND_CHANNEL, data);
+				}
+			});
+		}
+
+		if (endIndex < chunks.size()) {
+			final int nextStart = endIndex;
+			if (player.isOnline()) {
+				SchedulerCompat.runEntityLater(player, plugin.plugin, () -> sendChunksBatched(player, worldName, chunks, nextStart), 1L);
+			}
+		}
+	}
+
+	public void handlePlayerQuit(PlayerQuitEvent event) {
+		if (chunkInjector != null) {
+			chunkInjector.eject(event.getPlayer());
+		}
+
+		UUID playerId = event.getPlayer().getUniqueId();
+		pendingUpdates.remove(playerId);
+		pendingFlush.remove(playerId);
+		plugin.viaBlocksEnabledPlayers.remove(playerId);
+		plugin.setPlayerEnabled(event.getPlayer(), false);
+	}
+
+	public void handleChunkLoad(ChunkLoadEvent event) {
+		if (!plugin.isEnabled() || !hasViaBlocksPlayersInWorld(event.getWorld())) return;
+		prepareChunkCache(event.getChunk());
+	}
+
+	public void prepareChunkCache(Chunk chunk) {
+		if (!plugin.isEnabled() || !chunk.isLoaded() || modernMaterials.isEmpty()) return;
+		if (plugin.chunkExecutor == null || plugin.chunkExecutor.isShutdown()) return;
+
+		String key = chunkKey(chunk.getWorld().getName(), chunk.getX(), chunk.getZ());
+
+		if (chunkPacketCache.getIfPresent(key) != null) return;
+
+		ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+		int minHeight = chunk.getWorld().getMinHeight();
+		int maxHeight = chunk.getWorld().getMaxHeight();
+
+		plugin.chunkExecutor.submit(() -> {
+			try {
+				if (chunkPacketCache.getIfPresent(key) != null) return;
+				Map<Integer, List<Long>> foundBlocks = findModernBlocksInChunk(snapshot, minHeight, maxHeight);
+				if (foundBlocks.isEmpty()) {
+					chunkPacketCache.put(key, EMPTY_PACKET);
+				} else {
+					chunkPacketCache.put(key, buildChunkPacket(foundBlocks));
+				}
+			} catch (Exception e) {}
+		});
+	}
+
+	public byte[] getExtraDataForChunk(String worldName, int x, int z) {
+		return chunkPacketCache.getIfPresent(chunkKey(worldName, x, z));
+	}
+
+	public void cacheChunkWithCallback(World world, int x, int z, Consumer<byte[]> callback) {
+		if (!plugin.isEnabled()) {
+			deliverCallback(callback, null);
+			return;
+		}
+
+		String key = chunkKey(world.getName(), x, z);
+		byte[] existing = chunkPacketCache.getIfPresent(key);
+		if (existing != null) {
+			deliverCallback(callback, existing.length > 0 ? existing : null);
+			return;
+		}
+
+		if (!world.isChunkLoaded(x, z)) {
+			chunkPacketCache.put(key, EMPTY_PACKET);
+			deliverCallback(callback, null);
+			return;
+		}
+
+		Chunk chunk = world.getChunkAt(x, z);
+		if (!chunk.isLoaded() || modernMaterials.isEmpty()) {
+			chunkPacketCache.put(key, EMPTY_PACKET);
+			deliverCallback(callback, null);
+			return;
+		}
+
+		if (plugin.chunkExecutor == null || plugin.chunkExecutor.isShutdown()) {
+			chunkPacketCache.put(key, EMPTY_PACKET);
+			deliverCallback(callback, null);
+			return;
+		}
+
+		ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+		int minHeight = world.getMinHeight();
+		int maxHeight = world.getMaxHeight();
+
+		plugin.chunkExecutor.submit(() -> {
+			try {
+				byte[] cached = chunkPacketCache.getIfPresent(key);
+				if (cached != null) {
+					deliverCallback(callback, cached.length > 0 ? cached : null);
+					return;
+				}
+				Map<Integer, List<Long>> foundBlocks = findModernBlocksInChunk(snapshot, minHeight, maxHeight);
+				if (foundBlocks.isEmpty()) {
+					chunkPacketCache.put(key, EMPTY_PACKET);
+					deliverCallback(callback, null);
+				} else {
+					@SuppressWarnings("null")
+					@Nonnull byte[] data = buildChunkPacket(foundBlocks);
+					chunkPacketCache.put(key, data);
+					deliverCallback(callback, data);
+				}
+			} catch (Exception e) {
+				deliverCallback(callback, null);
+			}
+		});
+	}
+
+	@SuppressWarnings("unchecked")
+	private Map<Integer, List<Long>> findModernBlocksInChunk(ChunkSnapshot chunkSnapshot, int minHeight, int maxHeight) {
+		Int2ObjectMap<LongList> foundBlocks = new Int2ObjectOpenHashMap<>();
+
+		int chunkX = chunkSnapshot.getX() << 4;
+		int chunkZ = chunkSnapshot.getZ() << 4;
+
+		for (int x = 0; x < 16; x++) {
+			for (int z = 0; z < 16; z++) {
+				for (int y = minHeight; y < maxHeight; y++) {
+					// Check material FIRST — getBlockType() returns an enum, no allocation
+					Material blockType = chunkSnapshot.getBlockType(x, y, z);
+					if (blockType == Material.AIR
+							|| blockType == Material.CAVE_AIR
+							|| blockType == Material.VOID_AIR
+							|| !this.modernMaterials.contains(blockType)) {
+						continue;
+					}
+
+					// Only allocate BlockData for confirmed modern blocks
+					@SuppressWarnings("null")
+					@Nonnull BlockData data = chunkSnapshot.getBlockData(x, y, z);
+
+					Integer cachedId = blockDataIdCache.getIfPresent(data);
+					int materialId;
+					if (cachedId != null) {
+						materialId = cachedId;
+					} else {
+						materialId = this.paletteManager.getOrCreateId(data.getAsString());
+						blockDataIdCache.put(data, materialId);
+					}
+
+					if (materialId != -1) {
+						long packedLocation = packLocation(chunkX + x, y, chunkZ + z);
+						LongList locs = foundBlocks.get(materialId);
+						if (locs == null) {
+							locs = new LongArrayList();
+							foundBlocks.put(materialId, locs);
+						}
+						locs.add(packedLocation);
+					}
+				}
+			}
+		}
+		return (Map<Integer, List<Long>>) (Map<?, ?>) foundBlocks;
+	}
+
+	public byte[] getExtraDataForMultiBlock(World world, List<Long> locations) {
+		Map<Integer, List<Long>> foundBlocks = new HashMap<>();
+
+		for (long packedLoc : locations) {
+			Integer cachedId = recentModernChanges.getIfPresent(packedLoc);
+			if (cachedId != null) {
+				List<Long> locs = foundBlocks.get(cachedId);
+				if (locs == null) {
+					locs = new ArrayList<>();
+					foundBlocks.put(cachedId, locs);
+				}
+				locs.add(packedLoc);
+				continue;
+			}
+
+			int x = (int) (packedLoc >> 38);
+
+			int y = (int) ((packedLoc << 52) >> 52);
+
+			int z = (int) ((packedLoc << 26) >> 38);
+
+			Block block = world.getBlockAt(x, y, z);
+			BlockData data = block.getBlockData();
+
+			if (isModernMaterial(data.getMaterial())) {
+				int id = getMaterialId(data);
+				if (id != -1) {
+					List<Long> locs2 = foundBlocks.get(id);
+					if (locs2 == null) {
+						locs2 = new ArrayList<>();
+						foundBlocks.put(id, locs2);
+					}
+					locs2.add(packedLoc);
+				}
+			}
+		}
+
+		if (foundBlocks.isEmpty()) return null;
+		return buildChunkPacket(foundBlocks);
+	}
+
+	public byte[] getExtraDataForSingleBlock(World world, int x, int y, int z) {
+		Block block = world.getBlockAt(x, y, z);
+		BlockData data = block.getBlockData();
+		long packed = packLocation(x, y, z);
+
+		if (!isModernMaterial(data.getMaterial())) {
+			Integer cachedId = recentModernChanges.getIfPresent(packed);
+			if (cachedId != null && cachedId > 0) {
+				recentModernChanges.put(packed, 0);
+				ByteArrayDataOutput out = ByteStreams.newDataOutput();
+				out.writeUTF("ADD_SINGLE");
+				out.writeInt(0);
+				out.writeLong(packed);
+				return out.toByteArray();
+			}
+			return null;
+		}
+
+		int id = getMaterialId(data);
+		if (id == -1) return null;
+
+		recentModernChanges.put(packed, id);
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("ADD_SINGLE");
+		out.writeInt(id);
+		out.writeLong(packed);
+		return out.toByteArray();
+	}
+
+	public void handleBlockPlace(BlockPlaceEvent event) {
+		handleModernBlockChange(
+			event.getBlockReplacedState().getBlockData(),
+			event.getBlock().getBlockData(),
+			event.getBlock().getLocation()
+		);
+	}
+
+	public void handleBlockBreak(BlockBreakEvent event) {
+		Block block = event.getBlock();
+		BlockData data = block.getBlockData();
+		Location loc = block.getLocation();
+
+		handleModernBlockChange(data, Material.AIR.createBlockData(), loc);
+
+		if (data instanceof Door) {
+			Door door = (Door) data;
+			Location otherHalf = door.getHalf() == Bisected.Half.BOTTOM
+				? loc.clone().add(0, 1, 0)
+				: loc.clone().add(0, -1, 0);
+			long otherPacked = packLocation(otherHalf);
+			recentModernChanges.put(otherPacked, 0);
+			invalidateChunkCache(otherHalf.getChunk());
+		}
+	}
+
+	public void handleBlockExplode(BlockExplodeEvent event) {
+		for (Block block : event.blockList()) {
+			handleModernBlockChange(
+				block.getBlockData(),
+				Material.AIR.createBlockData(),
+				block.getLocation()
+			);
+		}
+	}
+
+	public void handleBlockFromTo(BlockFromToEvent event) {
+		Block destroyedBlock = event.getToBlock();
+		handleModernBlockChange(
+			destroyedBlock.getBlockData(),
+			Material.AIR.createBlockData(),
+			destroyedBlock.getLocation()
+		);
+	}
+
+	public void handleBlockGrow(BlockGrowEvent event) {
+		handleModernBlockChange(
+			event.getBlock().getBlockData(),
+			event.getNewState().getBlockData(),
+			event.getBlock().getLocation()
+		);
+	}
+
+	public void handleBlockFade(BlockFadeEvent event) {
+		handleModernBlockChange(
+			event.getBlock().getBlockData(),
+			event.getNewState().getBlockData(),
+			event.getBlock().getLocation()
+		);
+	}
+
+	public void handleBlockForm(BlockFormEvent event) {
+		handleModernBlockChange(
+			event.getBlock().getBlockData(),
+			event.getNewState().getBlockData(),
+			event.getBlock().getLocation()
+		);
+	}
+
+	public void handleBlockSpread(BlockSpreadEvent event) {
+		handleModernBlockChange(
+			event.getBlock().getBlockData(),
+			event.getNewState().getBlockData(),
+			event.getBlock().getLocation()
+		);
+	}
+
+	public void handleBlockPhysics(BlockPhysicsEvent event) {
+		Block block = event.getBlock();
+		if (isModernMaterial(block.getType())) {
+			BlockData data = block.getBlockData();
+			long packed = packLocation(block.getLocation());
+
+			Integer cachedId = recentModernChanges.getIfPresent(packed);
+			int currentId = getMaterialId(data);
+
+			if (cachedId == null || cachedId != currentId) {
+				recentModernChanges.put(packed, currentId);
+				sendBlockStateUpdateToNearbyPlayers(block.getLocation(), data);
+				invalidateChunkCache(block.getChunk());
+			}
+		}
+	}
+
+	private void handleModernBlockChange(BlockData before, BlockData after, Location location) {
+		if (!plugin.isEnabled() || location == null) return;
+
+		boolean afterModern = after != null && isModernMaterial(after.getMaterial());
+		boolean beforeModern = before != null && isModernMaterial(before.getMaterial());
+		long packed = packLocation(location);
+
+		if (afterModern) {
+			int id = getMaterialId(after);
+			recentModernChanges.put(packed, id);
+			sendBlockStateUpdateToNearbyPlayers(location, after);
+		} else if (beforeModern || recentModernChanges.getIfPresent(packed) != null) {
+			recentModernChanges.put(packed, 0);
+			sendClearUpdateToNearbyPlayers(location);
+		} else {
+			recentModernChanges.invalidate(packed);
+		}
+
+		invalidateChunkCache(location.getChunk());
+	}
+
+	public Integer getRecentChange(long packed) {
+		return recentModernChanges.getIfPresent(packed);
+	}
+
+	private void sendBlockStateUpdateToNearbyPlayers(Location location, BlockData data) {
+		if (!plugin.isEnabled() || data == null || location.getWorld() == null) return;
+		Integer cachedId = blockDataIdCache.getIfPresent(data);
+		int stateId;
+		if (cachedId != null) {
+			stateId = cachedId;
+		} else {
+			stateId = this.paletteManager.getOrCreateId(data.getAsString());
+			blockDataIdCache.put(data, stateId);
+		}
+		if (stateId == -1) return;
+
+		scheduleNearbyEnabledPlayers(location, player -> sendPacket(player, stateId, location));
+	}
+
+	private void sendClearUpdateToNearbyPlayers(Location location) {
+		if (!plugin.isEnabled() || plugin.viaBlocksEnabledPlayers.isEmpty() || location.getWorld() == null) return;
+		final int AIR_ID = 0;
+
+		scheduleNearbyEnabledPlayers(location, player -> sendPacket(player, AIR_ID, location));
+	}
+
+	private void invalidateChunkCache(Chunk chunk) {
+		if (chunk == null) return;
+		chunkPacketCache.invalidate(chunkKey(chunk.getWorld().getName(), chunk.getX(), chunk.getZ()));
+	}
+
+	private void sendPacket(Player player, int stateId, Location location) {
+		if (!player.isOnline()) return;
+		UUID playerId = player.getUniqueId();
+		Map<Integer, List<Long>> updateData = pendingUpdates.get(playerId);
+		if (updateData == null) {
+			updateData = new HashMap<>();
+			pendingUpdates.put(playerId, updateData);
+		}
+		List<Long> stateList = updateData.get(stateId);
+		if (stateList == null) {
+			stateList = new ArrayList<>();
+			updateData.put(stateId, stateList);
+		}
+		stateList.add(packLocation(location));
+		if (pendingFlush.add(playerId)) {
+			SchedulerCompat.runEntityLater(player, plugin.plugin, () -> flushPendingUpdates(playerId), plugin.getUpdateBatchDelayTicks());
+		}
+	}
+
+	private void flushPendingUpdates(UUID playerId) {
+		Map<Integer, List<Long>> updateData = pendingUpdates.remove(playerId);
+		pendingFlush.remove(playerId);
+		if (updateData == null || updateData.isEmpty()) return;
+
+		Player player = plugin.plugin.getServer().getPlayer(playerId);
+		if (player == null || !player.isOnline()) return;
+
+		byte[] packetData = buildChunkPacket(updateData);
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaBlocksPlugin.CLIENTBOUND_CHANNEL, packetData);
+	}
+
+	private int getMaterialId(BlockData data) {
+		@SuppressWarnings("null")
+		Integer cachedId = blockDataIdCache.getIfPresent(data);
+		if (cachedId != null) return cachedId;
+
+		int id = this.paletteManager.getOrCreateId(data.getAsString());
+		blockDataIdCache.put(data, id);
+		return id;
+	}
+
+	@SuppressWarnings("null")
+	private @Nonnull byte[] buildChunkPacket(Map<Integer, List<Long>> blockData) {
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("ADD_CHUNK");
+		out.writeInt(blockData.size());
+		for (Map.Entry<Integer, List<Long>> entry : blockData.entrySet()) {
+			out.writeInt(entry.getKey());
+			out.writeInt(entry.getValue().size());
+			for (Long loc : entry.getValue()) {
+				out.writeLong(loc);
+			}
+		}
+		return out.toByteArray();
+	}
+
+	public void sendPaletteToClient(Player player) {
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("INIT_PALETTE");
+		List<String> palette = this.paletteManager.getPalette();
+		out.writeInt(palette.size());
+		for (String state : palette) {
+			out.writeUTF(state);
+		}
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaBlocksPlugin.CLIENTBOUND_CHANNEL, out.toByteArray());
+	}
+
+	public boolean isModernMaterial(Material material) {
+		return this.modernMaterials.contains(material);
+	}
+
+	public void processChunkForSinglePlayer(Chunk chunk, Player player) {
+		if (!chunk.isLoaded() || !plugin.isPlayerEnabled(player)) return;
+		cacheChunkWithCallback(chunk.getWorld(), chunk.getX(), chunk.getZ(), data -> {
+			if (!player.isOnline() || !plugin.isPlayerEnabled(player)) return;
+			if (data != null && data.length > 0) {
+				SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaBlocksPlugin.CLIENTBOUND_CHANNEL, data);
+			}
+		});
+	}
+
+	public void clearCache() {
+		blockDataIdCache.invalidateAll();
+		pendingUpdates.clear();
+		pendingFlush.clear();
+		chunkPacketCache.invalidateAll();
+		recentModernChanges.invalidateAll();
+	}
+
+	private void deliverCallback(Consumer<byte[]> callback, byte[] data) {
+		if (callback != null) {
+			callback.accept(data);
+		}
+	}
+
+	private boolean hasViaBlocksPlayersInWorld(World world) {
+		for (UUID playerId : plugin.viaBlocksEnabledPlayers) {
+			Player player = Bukkit.getPlayer(playerId);
+			if (player != null && player.isOnline() && world.equals(player.getWorld())) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private void scheduleNearbyEnabledPlayers(Location location, Consumer<Player> action) {
+		World world = location.getWorld();
+		if (world == null) return;
+
+		SchedulerCompat.runGlobal(plugin.plugin, () -> {
+			for (Player player : Bukkit.getOnlinePlayers()) {
+				if (!plugin.isPlayerEnabled(player)) continue;
+				SchedulerCompat.runEntity(player, plugin.plugin, () -> {
+					if (!player.isOnline()) return;
+					if (!world.equals(player.getWorld())) return;
+					if (player.getLocation().distanceSquared(location) >= UPDATE_RADIUS_SQUARED) return;
+					action.accept(player);
+				});
+			}
+		});
+	}
+
+	public long packLocation(int x, int y, int z) {
+		return ((long)x & X_MASK) << X_SHIFT | ((long)z & Z_MASK) << Z_SHIFT | ((long)y & Y_MASK);
+	}
+
+	public long packLocation(Location loc) {
+		return packLocation(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
+	}
+}

src/main/java/tf/tuff/viablocks/PaletteManager.java

@@ -0,0 +1,137 @@
+package tf.tuff.viablocks;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import com.google.common.io.ByteArrayDataOutput;
+import com.google.common.io.ByteStreams;
+
+import tf.tuff.util.SchedulerCompat;
+import tf.tuff.viablocks.version.VersionAdapter;
+
+public class PaletteManager {
+
+	ViaBlocksPlugin plugin;
+
+	private final CopyOnWriteArrayList<String> palette = new CopyOnWriteArrayList<>();
+	private final Map<String, Integer> stateToIdMap = new ConcurrentHashMap<>();
+	private volatile List<String> paletteSnapshot;
+
+	public PaletteManager(VersionAdapter versionAdapter) {
+		plugin = ViaBlocksPlugin.instance;
+		generate(versionAdapter);
+	}
+
+	private void generate(VersionAdapter versionAdapter) {
+		plugin.info("Generating ViaBlocks Pre-Defined Palette...");
+
+		List<String> initialPalette = new ArrayList<>();
+
+		for (Material material : versionAdapter.getModernMaterials()) {
+			if (material.isBlock()) {
+				addEntryInternal(initialPalette, versionAdapter.getMaterialKey(material));
+			}
+		}
+
+		String[] thickness = {"tip", "frustum", "middle", "base"};
+		String[] direction = {"up", "down"};
+		String[] bools = {"true", "false"};
+		String[] facings = {"north", "south", "east", "west"};
+		String[] tilts = {"none", "unbalanced", "partial", "full"};
+
+		for (String d : direction) {
+			for (String t : thickness) {
+				for (String w : bools) {
+					addEntryInternal(initialPalette, "minecraft:pointed_dripstone[thickness=" + t + ",vertical_direction=" + d + ",waterlogged=" + w + "]");
+				}
+			}
+		}
+
+		for (String f : facings) {
+			for (String t : tilts) {
+				for (String w : bools) {
+					addEntryInternal(initialPalette, "minecraft:big_dripleaf[facing=" + f + ",tilt=" + t + ",waterlogged=" + w + "]");
+				}
+			}
+		}
+
+		for (String f : facings) {
+			for (String h : new String[]{"lower", "upper"}) {
+				addEntryInternal(initialPalette, "minecraft:small_dripleaf[facing=" + f + ",half=" + h + ",waterlogged=false]");
+			}
+		}
+
+		for (String b : bools) {
+			addEntryInternal(initialPalette, "minecraft:cave_vines[age=0,berries=" + b + "]");
+			addEntryInternal(initialPalette, "minecraft:cave_vines_plant[berries=" + b + "]");
+		}
+
+		palette.addAll(initialPalette);
+		paletteSnapshot = new ArrayList<>(palette);
+		plugin.info("Palette initialized with " + palette.size() + " entries.");
+	}
+
+	private void addEntryInternal(List<String> localPalette, String state) {
+		if (!stateToIdMap.containsKey(state)) {
+			stateToIdMap.put(state, localPalette.size());
+			localPalette.add(state);
+		}
+	}
+
+	public int getOrCreateId(String state) {
+		Integer id = stateToIdMap.get(state);
+		if (id != null) {
+			return id;
+		}
+
+		synchronized (this) {
+			 id = stateToIdMap.get(state);
+			 if (id != null) return id;
+
+			 int newId = palette.size();
+			 palette.add(state);
+			 stateToIdMap.put(state, newId);
+			 paletteSnapshot = null;
+
+			 broadcastNewPaletteEntry(state);
+			 return newId;
+		}
+	}
+
+	private void broadcastNewPaletteEntry(String state) {
+		if (plugin == null || !plugin.plugin.isEnabled() || !plugin.isEnabled()) return;
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("NEW_PALETTE_ENTRY");
+		out.writeUTF(state);
+		byte[] data = out.toByteArray();
+
+		SchedulerCompat.runGlobal(plugin.plugin, () -> {
+			if (!plugin.plugin.isEnabled() || !plugin.isEnabled()) return;
+			for (Player player : Bukkit.getOnlinePlayers()) {
+				if (plugin.isPlayerEnabled(player)) {
+					SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaBlocksPlugin.CLIENTBOUND_CHANNEL, data);
+				}
+			}
+		});
+	}
+
+	public synchronized int getId(String state) {
+		return stateToIdMap.getOrDefault(state, -1);
+	}
+
+	public synchronized List<String> getPalette() {
+		List<String> snapshot = paletteSnapshot;
+		if (snapshot == null) {
+			snapshot = new ArrayList<>(palette);
+			paletteSnapshot = snapshot;
+		}
+		return snapshot;
+	}
+}

src/main/java/tf/tuff/viablocks/ViaBlocksPlugin.java

@@ -0,0 +1,317 @@
+package tf.tuff.viablocks;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.logging.Level;
+
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+
+import net.md_5.bungee.api.ChatColor;
+import net.md_5.bungee.api.chat.ClickEvent;
+import net.md_5.bungee.api.chat.ComponentBuilder;
+import net.md_5.bungee.api.chat.HoverEvent;
+import net.md_5.bungee.api.chat.TextComponent;
+import net.md_5.bungee.api.chat.hover.content.Text;
+import tf.tuff.viablocks.version.VersionAdapter;
+import tf.tuff.viablocks.version.modern.ModernAdapter;
+import tf.tuff.TuffX;
+import tf.tuff.util.SchedulerCompat;
+
+public final class ViaBlocksPlugin {
+
+	public static final String CLIENTBOUND_CHANNEL = "viablocks:data";
+	public static final String SERVERBOUND_CHANNEL = "viablocks:handshake";
+
+	public final Set<UUID> viaBlocksEnabledPlayers = ConcurrentHashMap.newKeySet();
+	public CustomBlockListener blockListener;
+	static ViaBlocksPlugin instance;
+
+	private File playerDataFile;
+	private FileConfiguration playerDataConfig;
+	private final Set<UUID> joinedPlayersCache = ConcurrentHashMap.newKeySet();
+
+	private boolean enabled;
+	private boolean debug;
+	private boolean sendWelcomeBook;
+
+	public VersionAdapter versionAdapter;
+
+	public PaletteManager paletteManager;
+	private long updateBatchDelayTicks = 1L;
+	public ExecutorService chunkExecutor;
+	public TuffX plugin;
+
+	public ViaBlocksPlugin(TuffX plugin){
+		this.plugin = plugin;
+	}
+
+	public void onTuffXReload() {
+		Set<UUID> previouslyEnabledPlayers = ConcurrentHashMap.newKeySet();
+		previouslyEnabledPlayers.addAll(viaBlocksEnabledPlayers);
+
+		loadSyncSettings();
+
+		if (chunkExecutor != null) {
+			chunkExecutor.shutdownNow();
+		}
+		this.chunkExecutor = enabled
+			? Executors.newFixedThreadPool(Math.max(1, Runtime.getRuntime().availableProcessors()))
+			: null;
+
+		if (playerDataFile == null) {
+			playerDataFile = new File(plugin.getDataFolder(), "players.yml");
+		}
+		playerDataConfig = YamlConfiguration.loadConfiguration(playerDataFile);
+
+		if (blockListener != null) {
+			blockListener.clearCache();
+		}
+
+		viaBlocksEnabledPlayers.clear();
+		if (enabled && blockListener != null) {
+			for (Player player : plugin.getServer().getOnlinePlayers()) {
+				if (!previouslyEnabledPlayers.contains(player.getUniqueId())) continue;
+				setPlayerEnabled(player, true);
+				blockListener.onViaBlocksPlayerJoin(player);
+			}
+		}
+
+		info("ViaBlocks reloaded.");
+	}
+
+	public void onTuffXEnable() {
+		instance = this;
+
+		this.versionAdapter = new ModernAdapter();
+
+		this.paletteManager = new PaletteManager(this.versionAdapter);
+
+		plugin.saveDefaultConfig();
+		loadSyncSettings();
+		this.chunkExecutor = enabled
+			? Executors.newFixedThreadPool(Math.max(1, Runtime.getRuntime().availableProcessors()))
+			: null;
+		setupPlayerData();
+
+
+		plugin.getServer().getMessenger().registerOutgoingPluginChannel(plugin, CLIENTBOUND_CHANNEL);
+		plugin.getServer().getMessenger().registerIncomingPluginChannel(plugin, SERVERBOUND_CHANNEL, plugin);
+
+		this.blockListener = new CustomBlockListener(this, this.versionAdapter, this.paletteManager);
+
+		plugin.getCommand("viablocks").setExecutor(plugin);
+		if (enabled) {
+			info("ViaBlocks has been enabled successfully and is listening for client handshakes.");
+		} else {
+			info("ViaBlocks is disabled in config.");
+		}
+	}
+
+	public void handlePacket(Player player, byte[] message) {
+		if (!isEnabled() || blockListener == null) return;
+		if (!isPlayerEnabled(player) && isEnabled()) {
+			debug("Received ViaBlocks handshake from player: " + player.getName() + ". Enabling custom blocks.");
+			setPlayerEnabled(player, true);
+
+			blockListener.onViaBlocksPlayerJoin(player);
+		}
+	}
+
+	public PaletteManager getPaletteManager() {
+		return this.paletteManager;
+	}
+
+	public long getUpdateBatchDelayTicks() {
+		return this.updateBatchDelayTicks;
+	}
+
+	private void loadSyncSettings() {
+		enabled = plugin.getConfig().getBoolean("viablocks.viablocks-enabled", false);
+		debug = plugin.getConfig().getBoolean("viablocks.debug", false);
+		sendWelcomeBook = plugin.getConfig().getBoolean("viablocks.send-welcome-book", true);
+
+		String mode = plugin.getConfig().getString("viablocks.sync-mode", "normal");
+		if (mode == null) {
+			mode = "normal";
+		}
+		this.updateBatchDelayTicks = mode.equalsIgnoreCase("reduced") ? 10L : 1L;
+	}
+
+	public void onTuffXDisable(){
+		plugin.getServer().getMessenger().unregisterOutgoingPluginChannel(plugin, CLIENTBOUND_CHANNEL);
+		plugin.getServer().getMessenger().unregisterIncomingPluginChannel(plugin, SERVERBOUND_CHANNEL);
+
+		if (chunkExecutor != null) {
+			chunkExecutor.shutdownNow();
+			chunkExecutor = null;
+		}
+
+		viaBlocksEnabledPlayers.clear();
+
+		info("ViaBlocks has been disabled.");
+	}
+	private void setupPlayerData() {
+		playerDataFile = new File(plugin.getDataFolder(), "players.yml");
+		if (!playerDataFile.exists()) {
+			try {
+				playerDataFile.createNewFile();
+			} catch (IOException e) {
+				severe("Could not create players.yml!");
+				e.printStackTrace();
+			}
+		}
+		playerDataConfig = YamlConfiguration.loadConfiguration(playerDataFile);
+		joinedPlayersCache.clear();
+		for (String uuidStr : playerDataConfig.getStringList("joined-players")) {
+			try {
+				joinedPlayersCache.add(UUID.fromString(uuidStr));
+			} catch (IllegalArgumentException ignored) {
+			}
+		}
+	}
+	public boolean hasPlayerJoinedBefore(Player player) {
+		return joinedPlayersCache.contains(player.getUniqueId());
+	}
+	public boolean isFirstJoin(Player player) {
+		return !hasPlayerJoinedBefore(player);
+	}
+	public void markPlayerAsJoined(Player player) {
+		UUID uuid = player.getUniqueId();
+		if (joinedPlayersCache.add(uuid)) {
+			List<String> joinedPlayers = playerDataConfig.getStringList("joined-players");
+			joinedPlayers.add(uuid.toString());
+			playerDataConfig.set("joined-players", joinedPlayers);
+			try {
+				playerDataConfig.save(playerDataFile);
+			} catch (IOException e) {
+				severe("Could not save to players.yml!");
+				e.printStackTrace();
+			}
+		}
+	}
+	public void sendWelcomeGui(Player player) {
+		if (!this.sendWelcomeBook) return;
+		ItemStack book = new ItemStack(Material.WRITTEN_BOOK);
+		BookMeta meta = (BookMeta) book.getItemMeta();
+		if (meta == null) return;
+		meta.setTitle("ViaBlocks Information");
+		meta.setAuthor("ViaBlocks");
+		TextComponent welcome = new TextComponent("Welcome to ViaBlocks!");
+		welcome.setColor(ChatColor.DARK_AQUA);
+		welcome.setBold(true);
+		TextComponent body = new TextComponent("\n\nThis feature is in active development!\n\nIf you find any visual bugs or issues, please report them on our ");
+		body.setColor(ChatColor.BLACK);
+		TextComponent link = new TextComponent("bug tracker");
+		link.setColor(ChatColor.BLUE);
+		link.setUnderlined(true);
+		link.setClickEvent(new ClickEvent(ClickEvent.Action.OPEN_URL, "https://github.com/TuffNetwork/Tuff-Client-Builds/issues"));
+		link.setHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new Text(new ComponentBuilder("Click to open the bug tracker!").color(ChatColor.GRAY).create())));
+		TextComponent disclaimer = new TextComponent("\n\n(Bamboo and kelp are noted.)");
+		disclaimer.setColor(ChatColor.DARK_GRAY);
+		disclaimer.setItalic(true);
+		meta.spigot().addPage(new ComponentBuilder("").append(welcome).append(body).append(link).append(new TextComponent(".")).append(disclaimer).create());
+		book.setItemMeta(meta);
+		SchedulerCompat.runEntity(player, plugin, () -> player.openBook(book));
+	}
+
+	public boolean isEnabled() {
+		return enabled;
+	}
+
+	public boolean isPlayerEnabled(Player player) {
+		if (player == null) return false;
+		return viaBlocksEnabledPlayers.contains(player.getUniqueId());
+	}
+
+	public void setPlayerEnabled(Player player, boolean enabled) {
+		if (enabled && isEnabled()) {
+			viaBlocksEnabledPlayers.add(player.getUniqueId());
+		} else {
+			viaBlocksEnabledPlayers.remove(player.getUniqueId());
+		}
+	}
+
+	public CustomBlockListener getBlockListener() {
+		return this.blockListener;
+	}
+
+	public boolean onTuffXCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (!(sender instanceof Player)) {
+			sender.sendMessage("This command can only be executed by a player.");
+			return true;
+		}
+		Player player = (Player) sender;
+		if (args.length > 0) {
+			if (args[0].equalsIgnoreCase("get")) {
+				if (!player.hasPermission("tuffx.viablocks.command.get")) {
+					player.sendMessage("\u00A7cYou do not have permission to use this command.");
+					return true;
+				}
+				this.versionAdapter.giveCustomBlocks(player);
+				player.sendMessage("\u00A7aYou have been given a set of custom blocks.");
+				return true;
+			} else if (args[0].equalsIgnoreCase("refresh")) {
+				if (!player.hasPermission("tuffx.viablocks.command.refresh")) {
+					player.sendMessage("\u00A7cYou do not have permission to use this command.");
+					return true;
+				}
+				if (!isEnabled() || blockListener == null) {
+					player.sendMessage("\u00A7cViaBlocks is disabled.");
+					return true;
+				}
+				player.sendMessage("\u00A7aRefreshing modern blocks in your view distance...");
+				World world = player.getWorld();
+				int viewDistance = this.versionAdapter.getClientViewDistance(player);
+				int playerChunkX = player.getLocation().getChunk().getX();
+				int playerChunkZ = player.getLocation().getChunk().getZ();
+				for (int x = -viewDistance; x <= viewDistance; x++) {
+					for (int z = -viewDistance; z <= viewDistance; z++) {
+						int chunkX = playerChunkX + x;
+						int chunkZ = playerChunkZ + z;
+						if (world.isChunkLoaded(chunkX, chunkZ)) {
+							blockListener.processChunkForSinglePlayer(world.getChunkAt(chunkX, chunkZ), player);
+						}
+					}
+				}
+				player.sendMessage("\u00A7aRefresh complete!");
+				return true;
+			}
+		}
+		player.sendMessage("\u00A7cInvalid usage. Use: /viablocks <get|refresh>");
+		return true;
+	}
+
+	public boolean isDebug() {
+		return debug;
+	}
+	public void debug(String message) {
+		if (isDebug()) info(message);
+	}
+
+	public void log(Level level, String msg, Throwable e) {
+		plugin.getLogger().log(level, "[ViaBlocks] "+msg, e);
+	}
+	public void log(Level level, String msg) {
+		plugin.getLogger().log(level, "[ViaBlocks] "+msg);
+	}
+	public void info(String msg) {
+		log(Level.INFO, msg);
+	}
+	public void severe(String msg) {
+		log(Level.SEVERE, msg);
+	}
+}

src/main/java/tf/tuff/viablocks/version/VersionAdapter.java

@@ -0,0 +1,14 @@
+package tf.tuff.viablocks.version;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import java.util.EnumSet;
+
+public interface VersionAdapter {
+	String getBlockDataString(Block block);
+	String getMaterialKey(Material material);
+	int getClientViewDistance(Player player);
+	void giveCustomBlocks(Player player);
+	EnumSet<Material> getModernMaterials();
+}

src/main/java/tf/tuff/viablocks/version/modern/ModernAdapter.java

@@ -0,0 +1,669 @@
+package tf.tuff.viablocks.version.modern;
+
+import tf.tuff.viablocks.version.VersionAdapter;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import java.lang.reflect.Method;
+import java.util.EnumSet;
+
+public class ModernAdapter implements VersionAdapter {
+
+	private static final String[] MODERN_MATERIAL_NAMES = {
+			"TUBE_CORAL",
+			"BRAIN_CORAL",
+			"BUBBLE_CORAL",
+			"FIRE_CORAL",
+			"HORN_CORAL",
+			"TUBE_CORAL_BLOCK",
+			"BRAIN_CORAL_BLOCK",
+			"BUBBLE_CORAL_BLOCK",
+			"FIRE_CORAL_BLOCK",
+			"HORN_CORAL_BLOCK",
+			"TUBE_CORAL_FAN",
+			"BRAIN_CORAL_FAN",
+			"BUBBLE_CORAL_FAN",
+			"FIRE_CORAL_FAN",
+			"HORN_CORAL_FAN",
+			"TUBE_CORAL_WALL_FAN",
+			"BRAIN_CORAL_WALL_FAN",
+			"BUBBLE_CORAL_WALL_FAN",
+			"FIRE_CORAL_WALL_FAN",
+			"HORN_CORAL_WALL_FAN",
+			"DEAD_TUBE_CORAL",
+			"DEAD_BRAIN_CORAL",
+			"DEAD_BUBBLE_CORAL",
+			"DEAD_FIRE_CORAL",
+			"DEAD_HORN_CORAL",
+			"DEAD_TUBE_CORAL_BLOCK",
+			"DEAD_BRAIN_CORAL_BLOCK",
+			"DEAD_BUBBLE_CORAL_BLOCK",
+			"DEAD_FIRE_CORAL_BLOCK",
+			"DEAD_HORN_CORAL_BLOCK",
+			"DEAD_TUBE_CORAL_FAN",
+			"DEAD_BRAIN_CORAL_FAN",
+			"DEAD_BUBBLE_CORAL_FAN",
+			"DEAD_FIRE_CORAL_FAN",
+			"DEAD_HORN_CORAL_FAN",
+			"DEAD_TUBE_CORAL_WALL_FAN",
+			"DEAD_BRAIN_CORAL_WALL_FAN",
+			"DEAD_BUBBLE_CORAL_WALL_FAN",
+			"DEAD_FIRE_CORAL_WALL_FAN",
+			"DEAD_HORN_CORAL_WALL_FAN",
+			"BUBBLE_COLUMN",
+			"SEA_PICKLE",
+			"KELP",
+			"KELP_PLANT",
+			"DRIED_KELP_BLOCK",
+			"SEAGRASS",
+			"TALL_SEAGRASS",
+			"STRIPPED_OAK_LOG",
+			"STRIPPED_SPRUCE_LOG",
+			"STRIPPED_BIRCH_LOG",
+			"STRIPPED_JUNGLE_LOG",
+			"STRIPPED_ACACIA_LOG",
+			"STRIPPED_DARK_OAK_LOG",
+			"STRIPPED_OAK_WOOD",
+			"STRIPPED_SPRUCE_WOOD",
+			"STRIPPED_BIRCH_WOOD",
+			"STRIPPED_JUNGLE_WOOD",
+			"STRIPPED_ACACIA_WOOD",
+			"STRIPPED_DARK_OAK_WOOD",
+			"OAK_WOOD",
+			"SPRUCE_WOOD",
+			"BIRCH_WOOD",
+			"JUNGLE_WOOD",
+			"ACACIA_WOOD",
+			"DARK_OAK_WOOD",
+			"BLUE_ICE",
+			"CONDUIT",
+			"PRISMARINE_STAIRS",
+			"PRISMARINE_BRICK_STAIRS",
+			"DARK_PRISMARINE_STAIRS",
+			"PRISMARINE_SLAB",
+			"PRISMARINE_BRICK_SLAB",
+			"DARK_PRISMARINE_SLAB",
+			"TURTLE_EGG",
+			"SMOOTH_STONE",
+			"SMOOTH_SANDSTONE",
+			"SMOOTH_QUARTZ",
+			"SMOOTH_RED_SANDSTONE",
+			"CUT_SANDSTONE",
+			"CUT_RED_SANDSTONE",
+			"SMOOTH_STONE_SLAB",
+			"CUT_SANDSTONE_SLAB",
+			"CUT_RED_SANDSTONE_SLAB",
+			"BARREL",
+			"BLAST_FURNACE",
+			"SMOKER",
+			"CARTOGRAPHY_TABLE",
+			"FLETCHING_TABLE",
+			"GRINDSTONE",
+			"LECTERN",
+			"SMITHING_TABLE",
+			"STONECUTTER",
+			"BELL",
+			"LANTERN",
+			"SCAFFOLDING",
+			"LOOM",
+			"COMPOSTER",
+			"STONE_STAIRS",
+			"GRANITE_STAIRS",
+			"POLISHED_GRANITE_STAIRS",
+			"DIORITE_STAIRS",
+			"POLISHED_DIORITE_STAIRS",
+			"ANDESITE_STAIRS",
+			"POLISHED_ANDESITE_STAIRS",
+			"STONE_SLAB",
+			"GRANITE_SLAB",
+			"POLISHED_GRANITE_SLAB",
+			"DIORITE_SLAB",
+			"POLISHED_DIORITE_SLAB",
+			"ANDESITE_SLAB",
+			"POLISHED_ANDESITE_SLAB",
+			"MOSSY_STONE_BRICK_STAIRS",
+			"MOSSY_STONE_BRICK_SLAB",
+			"MOSSY_COBBLESTONE_STAIRS",
+			"MOSSY_COBBLESTONE_SLAB",
+			"END_STONE_BRICK_STAIRS",
+			"END_STONE_BRICK_SLAB",
+			"RED_NETHER_BRICK_STAIRS",
+			"RED_NETHER_BRICK_SLAB",
+			"SMOOTH_SANDSTONE_STAIRS",
+			"SMOOTH_RED_SANDSTONE_STAIRS",
+			"SMOOTH_QUARTZ_STAIRS",
+			"GRANITE_WALL",
+			"DIORITE_WALL",
+			"ANDESITE_WALL",
+			"SANDSTONE_WALL",
+			"RED_SANDSTONE_WALL",
+			"BRICK_WALL",
+			"STONE_BRICK_WALL",
+			"MOSSY_STONE_BRICK_WALL",
+			"NETHER_BRICK_WALL",
+			"RED_NETHER_BRICK_WALL",
+			"CRACKED_NETHER_BRICKS",
+			"CHISELED_NETHER_BRICKS",
+			"END_STONE_BRICK_WALL",
+			"PRISMARINE_WALL",
+			"CORNFLOWER",
+			"LILY_OF_THE_VALLEY",
+			"WITHER_ROSE",
+			"SWEET_BERRY_BUSH",
+			"BAMBOO",
+			"BAMBOO_SAPLING",
+			"JIGSAW",
+			"BEE_NEST",
+			"BEEHIVE",
+			"HONEY_BLOCK",
+			"HONEYCOMB_BLOCK",
+			"CRIMSON_STEM",
+			"WARPED_STEM",
+			"STRIPPED_CRIMSON_STEM",
+			"STRIPPED_WARPED_STEM",
+			"CRIMSON_HYPHAE",
+			"WARPED_HYPHAE",
+			"STRIPPED_CRIMSON_HYPHAE",
+			"STRIPPED_WARPED_HYPHAE",
+			"CRIMSON_NYLIUM",
+			"WARPED_NYLIUM",
+			"CRIMSON_PLANKS",
+			"WARPED_PLANKS",
+			"CRIMSON_STAIRS",
+			"WARPED_STAIRS",
+			"CRIMSON_SLAB",
+			"WARPED_SLAB",
+			"CRIMSON_FENCE",
+			"WARPED_FENCE",
+			"CRIMSON_DOOR",
+			"WARPED_DOOR",
+			"CRIMSON_TRAPDOOR",
+			"WARPED_TRAPDOOR",
+			"CRIMSON_FENCE_GATE",
+			"WARPED_FENCE_GATE",
+			"CRIMSON_BUTTON",
+			"WARPED_BUTTON",
+			"CRIMSON_PRESSURE_PLATE",
+			"WARPED_PRESSURE_PLATE",
+			"CRIMSON_SIGN",
+			"WARPED_SIGN",
+			"CRIMSON_WALL_SIGN",
+			"WARPED_WALL_SIGN",
+			"NETHER_GOLD_ORE",
+			"ANCIENT_DEBRIS",
+			"CRYING_OBSIDIAN",
+			"RESPAWN_ANCHOR",
+			"NETHERITE_BLOCK",
+			"SOUL_SOIL",
+			"BASALT",
+			"POLISHED_BASALT",
+			"SMOOTH_BASALT",
+			"SOUL_TORCH",
+			"SOUL_WALL_TORCH",
+			"SOUL_LANTERN",
+			"SOUL_FIRE",
+			"CAMPFIRE",
+			"SOUL_CAMPFIRE",
+			"SHROOMLIGHT",
+			"TARGET",
+			"BLACKSTONE",
+			"GILDED_BLACKSTONE",
+			"POLISHED_BLACKSTONE",
+			"POLISHED_BLACKSTONE_BRICKS",
+			"CHISELED_POLISHED_BLACKSTONE",
+			"CRACKED_POLISHED_BLACKSTONE_BRICKS",
+			"BLACKSTONE_STAIRS",
+			"POLISHED_BLACKSTONE_STAIRS",
+			"POLISHED_BLACKSTONE_BRICK_STAIRS",
+			"BLACKSTONE_SLAB",
+			"POLISHED_BLACKSTONE_SLAB",
+			"POLISHED_BLACKSTONE_BRICK_SLAB",
+			"BLACKSTONE_WALL",
+			"POLISHED_BLACKSTONE_WALL",
+			"POLISHED_BLACKSTONE_BRICK_WALL",
+			"CRIMSON_ROOTS",
+			"WARPED_ROOTS",
+			"NETHER_SPROUTS",
+			"CRIMSON_FUNGUS",
+			"WARPED_FUNGUS",
+			"WEEPING_VINES",
+			"WEEPING_VINES_PLANT",
+			"TWISTING_VINES",
+			"TWISTING_VINES_PLANT",
+			"CHAIN",
+			"IRON_CHAIN",
+			"LODESTONE",
+			"DEEPSLATE",
+			"INFESTED_DEEPSLATE",
+			"COBBLED_DEEPSLATE",
+			"POLISHED_DEEPSLATE",
+			"DEEPSLATE_BRICKS",
+			"CRACKED_DEEPSLATE_BRICKS",
+			"DEEPSLATE_TILES",
+			"CRACKED_DEEPSLATE_TILES",
+			"CHISELED_DEEPSLATE",
+			"COBBLED_DEEPSLATE_STAIRS",
+			"POLISHED_DEEPSLATE_STAIRS",
+			"DEEPSLATE_BRICK_STAIRS",
+			"DEEPSLATE_TILE_STAIRS",
+			"COBBLED_DEEPSLATE_SLAB",
+			"POLISHED_DEEPSLATE_SLAB",
+			"DEEPSLATE_BRICK_SLAB",
+			"DEEPSLATE_TILE_SLAB",
+			"COBBLED_DEEPSLATE_WALL",
+			"POLISHED_DEEPSLATE_WALL",
+			"DEEPSLATE_BRICK_WALL",
+			"DEEPSLATE_TILE_WALL",
+			"DEEPSLATE_COAL_ORE",
+			"DEEPSLATE_IRON_ORE",
+			"DEEPSLATE_GOLD_ORE",
+			"DEEPSLATE_DIAMOND_ORE",
+			"DEEPSLATE_LAPIS_ORE",
+			"DEEPSLATE_REDSTONE_ORE",
+			"DEEPSLATE_EMERALD_ORE",
+			"DEEPSLATE_COPPER_ORE",
+			"COPPER_ORE",
+			"COPPER_BLOCK",
+			"CUT_COPPER",
+			"COPPER_CHAIN",
+			"EXPOSED_COPPER",
+			"EXPOSED_CUT_COPPER",
+			"EXPOSED_COPPER_CHAIN",
+			"WEATHERED_COPPER",
+			"WEATHERED_CUT_COPPER",
+			"WEATHERED_COPPER_CHAIN",
+			"OXIDIZED_COPPER",
+			"OXIDIZED_CUT_COPPER",
+			"OXIDIZED_COPPER_CHAIN",
+			"WAXED_COPPER_BLOCK",
+			"WAXED_CUT_COPPER",
+			"WAXED_COPPER_CHAIN",
+			"WAXED_EXPOSED_COPPER",
+			"WAXED_EXPOSED_CUT_COPPER",
+			"WAXED_EXPOSED_COPPER_CHAIN",
+			"WAXED_WEATHERED_COPPER",
+			"WAXED_WEATHERED_CUT_COPPER",
+			"WAXED_WEATHERED_COPPER_CHAIN",
+			"WAXED_OXIDIZED_COPPER",
+			"WAXED_OXIDIZED_CUT_COPPER",
+			"WAXED_OXIDIZED_COPPER_CHAIN",
+			"CUT_COPPER_STAIRS",
+			"EXPOSED_CUT_COPPER_STAIRS",
+			"WEATHERED_CUT_COPPER_STAIRS",
+			"OXIDIZED_CUT_COPPER_STAIRS",
+			"CUT_COPPER_SLAB",
+			"EXPOSED_CUT_COPPER_SLAB",
+			"WEATHERED_CUT_COPPER_SLAB",
+			"OXIDIZED_CUT_COPPER_SLAB",
+			"WAXED_CUT_COPPER_STAIRS",
+			"WAXED_EXPOSED_CUT_COPPER_STAIRS",
+			"WAXED_WEATHERED_CUT_COPPER_STAIRS",
+			"WAXED_OXIDIZED_CUT_COPPER_STAIRS",
+			"WAXED_CUT_COPPER_SLAB",
+			"WAXED_EXPOSED_CUT_COPPER_SLAB",
+			"WAXED_WEATHERED_CUT_COPPER_SLAB",
+			"WAXED_OXIDIZED_CUT_COPPER_SLAB",
+			"RAW_COPPER_BLOCK",
+			"RAW_IRON_BLOCK",
+			"RAW_GOLD_BLOCK",
+			"TUFF",
+			"CALCITE",
+			"AMETHYST_BLOCK",
+			"BUDDING_AMETHYST",
+			"AMETHYST_CLUSTER",
+			"LARGE_AMETHYST_BUD",
+			"MEDIUM_AMETHYST_BUD",
+			"SMALL_AMETHYST_BUD",
+			"DRIPSTONE_BLOCK",
+			"POINTED_DRIPSTONE",
+			"MOSS_BLOCK",
+			"MOSS_CARPET",
+			"HANGING_ROOTS",
+			"ROOTED_DIRT",
+			"AZALEA",
+			"FLOWERING_AZALEA",
+			"AZALEA_LEAVES",
+			"FLOWERING_AZALEA_LEAVES",
+			"SPORE_BLOSSOM",
+			"CAVE_VINES",
+			"CAVE_VINES_PLANT",
+			"GLOW_BERRIES",
+			"TINTED_GLASS",
+			"LIGHT",
+			"SCULK_SENSOR",
+			"CANDLE",
+			"WHITE_CANDLE",
+			"ORANGE_CANDLE",
+			"MAGENTA_CANDLE",
+			"LIGHT_BLUE_CANDLE",
+			"YELLOW_CANDLE",
+			"LIME_CANDLE",
+			"PINK_CANDLE",
+			"GRAY_CANDLE",
+			"LIGHT_GRAY_CANDLE",
+			"CYAN_CANDLE",
+			"PURPLE_CANDLE",
+			"BLUE_CANDLE",
+			"BROWN_CANDLE",
+			"GREEN_CANDLE",
+			"RED_CANDLE",
+			"BLACK_CANDLE",
+			"CANDLE_CAKE",
+			"WHITE_CANDLE_CAKE",
+			"ORANGE_CANDLE_CAKE",
+			"MAGENTA_CANDLE_CAKE",
+			"LIGHT_BLUE_CANDLE_CAKE",
+			"YELLOW_CANDLE_CAKE",
+			"LIME_CANDLE_CAKE",
+			"PINK_CANDLE_CAKE",
+			"GRAY_CANDLE_CAKE",
+			"LIGHT_GRAY_CANDLE_CAKE",
+			"CYAN_CANDLE_CAKE",
+			"PURPLE_CANDLE_CAKE",
+			"BLUE_CANDLE_CAKE",
+			"BROWN_CANDLE_CAKE",
+			"GREEN_CANDLE_CAKE",
+			"RED_CANDLE_CAKE",
+			"BLACK_CANDLE_CAKE",
+			"POWDER_SNOW",
+			"LIGHTNING_ROD",
+			"GLOW_LICHEN",
+			"BIG_DRIPLEAF",
+			"BIG_DRIPLEAF_STEM",
+			"SMALL_DRIPLEAF",
+			"MANGROVE_LOG",
+			"STRIPPED_MANGROVE_LOG",
+			"MANGROVE_WOOD",
+			"STRIPPED_MANGROVE_WOOD",
+			"MANGROVE_PLANKS",
+			"MANGROVE_STAIRS",
+			"MANGROVE_SLAB",
+			"MANGROVE_FENCE",
+			"MANGROVE_FENCE_GATE",
+			"MANGROVE_DOOR",
+			"MANGROVE_TRAPDOOR",
+			"MANGROVE_BUTTON",
+			"MANGROVE_PRESSURE_PLATE",
+			"MANGROVE_SIGN",
+			"MANGROVE_WALL_SIGN",
+			"MANGROVE_LEAVES",
+			"MANGROVE_ROOTS",
+			"MUDDY_MANGROVE_ROOTS",
+			"MANGROVE_PROPAGULE",
+			"MUD",
+			"PACKED_MUD",
+			"MUD_BRICKS",
+			"MUD_BRICK_STAIRS",
+			"MUD_BRICK_SLAB",
+			"MUD_BRICK_WALL",
+			"PEARLESCENT_FROGLIGHT",
+			"VERDANT_FROGLIGHT",
+			"OCHRE_FROGLIGHT",
+			"FROGSPAWN",
+			"REINFORCED_DEEPSLATE",
+			"SCULK",
+			"SCULK_CATALYST",
+			"SCULK_SHRIEKER",
+			"SCULK_VEIN",
+			"CHERRY_LOG",
+			"STRIPPED_CHERRY_LOG",
+			"CHERRY_WOOD",
+			"STRIPPED_CHERRY_WOOD",
+			"CHERRY_PLANKS",
+			"CHERRY_STAIRS",
+			"CHERRY_SLAB",
+			"CHERRY_FENCE",
+			"CHERRY_FENCE_GATE",
+			"CHERRY_DOOR",
+			"CHERRY_TRAPDOOR",
+			"CHERRY_BUTTON",
+			"CHERRY_PRESSURE_PLATE",
+			"CHERRY_SIGN",
+			"CHERRY_WALL_SIGN",
+			"CHERRY_LEAVES",
+			"CHERRY_SAPLING",
+			"PINK_PETALS",
+			"BAMBOO_BLOCK",
+			"STRIPPED_BAMBOO_BLOCK",
+			"BAMBOO_PLANKS",
+			"BAMBOO_STAIRS",
+			"BAMBOO_SLAB",
+			"BAMBOO_FENCE",
+			"BAMBOO_FENCE_GATE",
+			"BAMBOO_DOOR",
+			"BAMBOO_TRAPDOOR",
+			"BAMBOO_BUTTON",
+			"BAMBOO_PRESSURE_PLATE",
+			"BAMBOO_SIGN",
+			"BAMBOO_WALL_SIGN",
+			"BAMBOO_MOSAIC",
+			"BAMBOO_MOSAIC_STAIRS",
+			"BAMBOO_MOSAIC_SLAB",
+			"BAMBOO_HANGING_SIGN",
+			"OAK_HANGING_SIGN",
+			"SPRUCE_HANGING_SIGN",
+			"BIRCH_HANGING_SIGN",
+			"JUNGLE_HANGING_SIGN",
+			"ACACIA_HANGING_SIGN",
+			"DARK_OAK_HANGING_SIGN",
+			"MANGROVE_HANGING_SIGN",
+			"CHERRY_HANGING_SIGN",
+			"CRIMSON_HANGING_SIGN",
+			"WARPED_HANGING_SIGN",
+			"CHISELED_BOOKSHELF",
+			"SUSPICIOUS_SAND",
+			"SUSPICIOUS_GRAVEL",
+			"DECORATED_POT",
+			"PIGLIN_HEAD",
+			"CALIBRATED_SCULK_SENSOR",
+			"TORCHFLOWER",
+			"TORCHFLOWER_CROP",
+			"PITCHER_PLANT",
+			"PITCHER_CROP",
+			"SNIFFER_EGG",
+			"BRUSH",
+			"CRAFTER",
+			"TRIAL_SPAWNER",
+			"VAULT",
+			"TUFF_STAIRS",
+			"TUFF_SLAB",
+			"TUFF_WALL",
+			"POLISHED_TUFF",
+			"POLISHED_TUFF_STAIRS",
+			"POLISHED_TUFF_SLAB",
+			"POLISHED_TUFF_WALL",
+			"TUFF_BRICKS",
+			"TUFF_BRICK_STAIRS",
+			"TUFF_BRICK_SLAB",
+			"TUFF_BRICK_WALL",
+			"CHISELED_TUFF",
+			"CHISELED_TUFF_BRICKS",
+			"COPPER_GRATE",
+			"EXPOSED_COPPER_GRATE",
+			"WEATHERED_COPPER_GRATE",
+			"OXIDIZED_COPPER_GRATE",
+			"WAXED_COPPER_GRATE",
+			"WAXED_EXPOSED_COPPER_GRATE",
+			"WAXED_WEATHERED_COPPER_GRATE",
+			"WAXED_OXIDIZED_COPPER_GRATE",
+			"COPPER_BULB",
+			"EXPOSED_COPPER_BULB",
+			"WEATHERED_COPPER_BULB",
+			"OXIDIZED_COPPER_BULB",
+			"WAXED_COPPER_BULB",
+			"WAXED_EXPOSED_COPPER_BULB",
+			"WAXED_WEATHERED_COPPER_BULB",
+			"WAXED_OXIDIZED_COPPER_BULB",
+			"COPPER_TRAPDOOR",
+			"EXPOSED_COPPER_TRAPDOOR",
+			"WEATHERED_COPPER_TRAPDOOR",
+			"OXIDIZED_COPPER_TRAPDOOR",
+			"WAXED_COPPER_TRAPDOOR",
+			"WAXED_EXPOSED_COPPER_TRAPDOOR",
+			"WAXED_WEATHERED_COPPER_TRAPDOOR",
+			"WAXED_OXIDIZED_COPPER_TRAPDOOR",
+			"COPPER_DOOR",
+			"EXPOSED_COPPER_DOOR",
+			"WEATHERED_COPPER_DOOR",
+			"OXIDIZED_COPPER_DOOR",
+			"WAXED_COPPER_DOOR",
+			"WAXED_EXPOSED_COPPER_DOOR",
+			"WAXED_WEATHERED_COPPER_DOOR",
+			"WAXED_OXIDIZED_COPPER_DOOR",
+			"CHISELED_COPPER",
+			"EXPOSED_CHISELED_COPPER",
+			"WEATHERED_CHISELED_COPPER",
+			"OXIDIZED_CHISELED_COPPER",
+			"WAXED_CHISELED_COPPER",
+			"WAXED_EXPOSED_CHISELED_COPPER",
+			"WAXED_WEATHERED_CHISELED_COPPER",
+			"WAXED_OXIDIZED_CHISELED_COPPER",
+			"HEAVY_CORE",
+			"COPPER_CHEST",
+			"EXPOSED_COPPER_CHEST",
+			"WEATHERED_COPPER_CHEST",
+			"OXIDIZED_COPPER_CHEST",
+			"WAXED_COPPER_CHEST",
+			"WAXED_EXPOSED_COPPER_CHEST",
+			"WAXED_WEATHERED_COPPER_CHEST",
+			"WAXED_OXIDIZED_COPPER_CHEST",
+			"COPPER_LANTERN",
+			"EXPOSED_COPPER_LANTERN",
+			"WEATHERED_COPPER_LANTERN",
+			"OXIDIZED_COPPER_LANTERN",
+			"WAXED_COPPER_LANTERN",
+			"WAXED_EXPOSED_COPPER_LANTERN",
+			"WAXED_WEATHERED_COPPER_LANTERN",
+			"WAXED_OXIDIZED_COPPER_LANTERN",
+			"OPEN_EYEBLOSSOM",
+			"CLOSED_EYEBLOSSOM",
+			"POLISHED_BLACKSTONE_BUTTON",
+			"POLISHED_BLACKSTONE_PRESSURE_PLATE",
+			"DARK_OAK_BUTTON",
+			"DARK_OAK_PRESSURE_PLATE",
+			"DARK_OAK_TRAPDOOR",
+			"JUNGLE_BUTTON",
+			"JUNGLE_PRESSURE_PLATE",
+			"JUNGLE_TRAPDOOR",
+			"ACACIA_BUTTON",
+			"ACACIA_PRESSURE_PLATE",
+			"ACACIA_TRAPDOOR",
+			"SPRUCE_BUTTON",
+			"SPRUCE_PRESSURE_PLATE",
+			"SPRUCE_TRAPDOOR",
+			"BIRCH_BUTTON",
+			"BIRCH_PRESSURE_PLATE",
+			"BIRCH_TRAPDOOR",
+			"BUSH",
+			"FIREFLY_BUSH",
+			"SHORT_DRY_GRASS",
+			"TALL_DRY_GRASS",
+			"CACTUS_FLOWER",
+			"LEAF_LITTER",
+			"WILDFLOWERS",
+			"WARPED_WART_BLOCK",
+			"PALE_OAK_LOG",
+			"STRIPPED_PALE_OAK_LOG",
+			"PALE_OAK_WOOD",
+			"STRIPPED_PALE_OAK_WOOD",
+			"PALE_OAK_PLANKS",
+			"PALE_OAK_STAIRS",
+			"PALE_OAK_SLAB",
+			"PALE_OAK_FENCE",
+			"PALE_OAK_FENCE_GATE",
+			"PALE_OAK_DOOR",
+			"PALE_OAK_TRAPDOOR",
+			"PALE_OAK_BUTTON",
+			"PALE_OAK_PRESSURE_PLATE",
+			"PALE_OAK_SIGN",
+			"PALE_OAK_HANGING_SIGN",
+			"PALE_OAK_WALL_SIGN",
+			"PALE_OAK_LEAVES",
+			"PALE_OAK_SAPLING",
+			"PALE_MOSS_BLOCK",
+			"PALE_MOSS_CARPET",
+			"PALE_HANGING_MOSS",
+			"CREAKING_HEART",
+			"RESIN_BLOCK",
+			"RESIN_BRICKS",
+			"RESIN_BRICK_STAIRS",
+			"RESIN_BRICK_SLAB",
+			"RESIN_BRICK_WALL",
+			"CHISELED_RESIN_BRICKS",
+			"SPRUCE_SHELF",
+			"CRIMSON_SHELF",
+			"BAMBOO_SHELF",
+			"CHERRY_SHELF",
+			"PALE_OAK_SHELF",
+			"JUNGLE_SHELF",
+			"MANGROVE_SHELF",
+			"DARK_OAK_SHELF",
+			"OAK_SHELF",
+			"WARPED_SHELF",
+			"BIRCH_SHELF",
+			"ACACIA_SHELF",
+
+	};
+
+	private static volatile Method clientViewDistanceMethod;
+	private static volatile boolean clientViewDistanceChecked;
+
+	@Override
+	public EnumSet<Material> getModernMaterials() {
+		EnumSet<Material> materials = EnumSet.noneOf(Material.class);
+		for (String name : MODERN_MATERIAL_NAMES) {
+			Material material = Material.matchMaterial(name);
+			if (material != null) {
+				materials.add(material);
+			}
+		}
+		return materials;
+	}
+
+	@Override
+	public String getBlockDataString(Block block) {
+		return block.getBlockData().getAsString();
+	}
+
+	@Override
+	public String getMaterialKey(Material material) {
+		return material.getKey().toString();
+	}
+
+	@Override
+	public int getClientViewDistance(Player player) {
+		if (!clientViewDistanceChecked) {
+			try {
+				clientViewDistanceMethod = player.getClass().getMethod("getClientViewDistance");
+			} catch (Exception e) {
+				clientViewDistanceMethod = null;
+			}
+			clientViewDistanceChecked = true;
+		}
+		if (clientViewDistanceMethod != null) {
+			try {
+				Object value = clientViewDistanceMethod.invoke(player);
+				if (value instanceof Integer) {
+					return (Integer) value;
+				}
+			} catch (Exception e) {
+				return player.getServer().getViewDistance();
+			}
+		}
+		return player.getServer().getViewDistance();
+	}
+
+	@Override
+	public void giveCustomBlocks(Player player) {
+		addItemIfPresent(player, "DEEPSLATE");
+		addItemIfPresent(player, "TUFF");
+	}
+
+	private void addItemIfPresent(Player player, String materialName) {
+		Material material = Material.matchMaterial(materialName);
+		if (material != null) {
+			player.getInventory().addItem(new ItemStack(material));
+		}
+	}
+}

src/main/java/tf/tuff/viaentities/EntityDataHandler.java

@@ -0,0 +1,400 @@
+package tf.tuff.viaentities;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelOutboundHandlerAdapter;
+import io.netty.channel.ChannelPromise;
+import org.bukkit.entity.Player;
+
+import com.google.common.io.ByteArrayDataOutput;
+import com.google.common.io.ByteStreams;
+
+import tf.tuff.util.SchedulerCompat;
+
+public class EntityDataHandler extends ChannelOutboundHandlerAdapter {
+
+	private final ViaEntitiesPlugin plugin;
+	private final Player player;
+	private final EntityMappingManager entityMappingManager;
+
+	public EntityDataHandler(ViaEntitiesPlugin plugin, Player player) {
+		this.plugin = plugin;
+		this.player = player;
+		this.entityMappingManager = plugin.entityMappingManager;
+	}
+
+	@Override
+	public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+		String className = msg.getClass().getName();
+		String simpleClassName = msg.getClass().getSimpleName();
+
+		if (className.contains("Bundle") || simpleClassName.contains("Bundle")) {
+			try {
+				Iterable<?> packets = null;
+
+				for (java.lang.reflect.Method m : msg.getClass().getMethods()) {
+					if (m.getName().equals("subPackets") && m.getParameterCount() == 0) {
+						Object result = m.invoke(msg);
+						if (result instanceof Iterable) {
+							packets = (Iterable<?>) result;
+							break;
+						}
+					}
+				}
+
+				if (packets == null) {
+					Class<?> clazz = msg.getClass();
+					outer:
+					while (clazz != null) {
+						for (java.lang.reflect.Field f : clazz.getDeclaredFields()) {
+							f.setAccessible(true);
+							Object val = f.get(msg);
+							if (val instanceof Iterable) {
+								packets = (Iterable<?>) val;
+								break outer;
+							}
+						}
+						clazz = clazz.getSuperclass();
+					}
+				}
+
+				if (packets != null) {
+					for (Object subPacket : packets) {
+						String subClass = subPacket.getClass().getSimpleName();
+						String subFullClass = subPacket.getClass().getName();
+
+						if (subClass.contains("Add") || subClass.contains("Spawn") ||
+							subFullClass.contains("AddEntity") || subFullClass.contains("SpawnEntity")) {
+							handleSpawnPacket(subPacket);
+						}
+					}
+				}
+			} catch (Exception e) {
+			}
+		}
+
+		boolean isSpawnPacket = className.contains("SpawnEntity") || className.contains("AddEntity") ||
+			simpleClassName.equals("PacketPlayOutSpawnEntity") ||
+			simpleClassName.equals("PacketPlayOutSpawnEntityLiving") ||
+			simpleClassName.equals("ClientboundAddEntityPacket") ||
+			simpleClassName.equals("ClientboundAddMobPacket");
+
+		if (!isSpawnPacket) {
+			try {
+				java.lang.reflect.Method getTypeMethod = msg.getClass().getMethod("getType");
+				java.lang.reflect.Method getIdMethod = msg.getClass().getMethod("getId");
+				if (getTypeMethod != null && getIdMethod != null) {
+					Object typeResult = getTypeMethod.invoke(msg);
+					if (typeResult != null && typeResult.toString().contains("entity")) {
+						isSpawnPacket = true;
+					}
+				}
+			} catch (NoSuchMethodException e) {
+			} catch (Exception e) {
+			}
+		}
+
+		if (isSpawnPacket) {
+			try {
+				handleSpawnPacket(msg);
+			} catch (Exception e) {
+			}
+		} else if (className.contains("EntityMetadata") || className.contains("SetEntityData") ||
+				   simpleClassName.equals("PacketPlayOutEntityMetadata") ||
+				   simpleClassName.equals("ClientboundSetEntityDataPacket")) {
+			try {
+				int entityId = getIntField(msg, "a", "id", "entityId");
+				if (entityId != -1) {
+					sendEntityMetadata(entityId, null);
+				}
+			} catch (Exception e) {
+			}
+		} else if (className.contains("Animation") ||
+				   simpleClassName.equals("PacketPlayOutAnimation") ||
+				   simpleClassName.equals("ClientboundAnimatePacket")) {
+			try {
+				int entityId = getIntField(msg, "a", "id", "entityId");
+				int animationType = getIntField(msg, "b", "action", "animationType");
+				if (entityId != -1) {
+					sendEntityAnimation(entityId, animationType);
+				}
+			} catch (Exception e) {
+			}
+		} else if (className.contains("EntityDestroy") || className.contains("RemoveEntities") ||
+				   simpleClassName.equals("PacketPlayOutEntityDestroy") ||
+				   simpleClassName.equals("ClientboundRemoveEntitiesPacket")) {
+			try {
+				handleDestroyPacket(msg);
+			} catch (Exception e) {
+			}
+		}
+
+		super.write(ctx, msg, promise);
+	}
+
+	private void handleSpawnPacket(Object msg) throws Exception {
+		int entityId = -1;
+		Object entityTypeObj = null;
+		double x = 0, y = 0, z = 0;
+		float yaw = 0, pitch = 0;
+
+		java.util.List<Double> doubles = new java.util.ArrayList<>();
+		java.util.List<Byte> bytes = new java.util.ArrayList<>();
+
+		for (java.lang.reflect.Field field : msg.getClass().getDeclaredFields()) {
+			field.setAccessible(true);
+			Object value = field.get(msg);
+			String typeName = field.getType().getName();
+
+			if (value == null) continue;
+
+			if (typeName.contains("EntityType") || typeName.contains("EntityTypes")) {
+				entityTypeObj = value;
+			} else if (value instanceof Integer && entityId == -1) {
+				entityId = (Integer) value;
+			} else if (value instanceof Double) {
+				doubles.add((Double) value);
+			} else if (value instanceof Byte) {
+				bytes.add((Byte) value);
+			}
+		}
+
+		if (doubles.size() >= 3) {
+			x = doubles.get(0);
+			y = doubles.get(1);
+			z = doubles.get(2);
+		}
+
+		if (bytes.size() >= 2) {
+			pitch = bytes.get(0) * 360.0f / 256.0f;
+			yaw = bytes.get(1) * 360.0f / 256.0f;
+		}
+
+		if (entityId == -1) return;
+		if (entityTypeObj == null) return;
+
+		String entityTypeStr = entityTypeObj.toString();
+		String entityTypeName = extractEntityTypeName(entityTypeStr);
+
+		if (entityMappingManager.isModernEntity(entityTypeName)) {
+			sendEntitySpawn(entityId, entityTypeName, x, y, z, yaw, pitch);
+		}
+	}
+
+	private void handleDestroyPacket(Object msg) throws Exception {
+		for (java.lang.reflect.Field field : msg.getClass().getDeclaredFields()) {
+			field.setAccessible(true);
+			Object value = field.get(msg);
+			if (value instanceof it.unimi.dsi.fastutil.ints.IntList) {
+				it.unimi.dsi.fastutil.ints.IntList idList = (it.unimi.dsi.fastutil.ints.IntList) value;
+				for (int i = 0; i < idList.size(); i++) {
+					sendEntityDestroy(idList.getInt(i));
+				}
+				return;
+			} else if (value instanceof int[]) {
+				for (int id : (int[]) value) {
+					sendEntityDestroy(id);
+				}
+				return;
+			} else if (value instanceof java.util.List) {
+				for (Object item : (java.util.List<?>) value) {
+					if (item instanceof Integer) {
+						sendEntityDestroy((Integer) item);
+					}
+				}
+				return;
+			}
+		}
+	}
+
+	private int getIntField(Object msg, String... fieldNames) {
+		for (String name : fieldNames) {
+			try {
+				java.lang.reflect.Field field = msg.getClass().getDeclaredField(name);
+				field.setAccessible(true);
+				Object value = field.get(msg);
+				if (value instanceof Integer) return (Integer) value;
+				if (value instanceof Number) return ((Number) value).intValue();
+			} catch (Exception ignored) {}
+		}
+		return -1;
+	}
+
+	private double getDoubleField(Object msg, String... fieldNames) {
+		for (String name : fieldNames) {
+			try {
+				java.lang.reflect.Field field = msg.getClass().getDeclaredField(name);
+				field.setAccessible(true);
+				Object value = field.get(msg);
+				if (value instanceof Double) return (Double) value;
+				if (value instanceof Number) return ((Number) value).doubleValue();
+			} catch (Exception ignored) {}
+		}
+		return 0.0;
+	}
+
+	private float getAngleField(Object msg, String... fieldNames) {
+		for (String name : fieldNames) {
+			try {
+				java.lang.reflect.Field field = msg.getClass().getDeclaredField(name);
+				field.setAccessible(true);
+				Object value = field.get(msg);
+				if (value instanceof Byte) return ((Byte) value) * 360.0f / 256.0f;
+				if (value instanceof Float) return (Float) value;
+				if (value instanceof Number) return ((Number) value).floatValue();
+			} catch (Exception ignored) {}
+		}
+		return 0.0f;
+	}
+
+	private Object getField(Object msg, String... fieldNames) {
+		for (String name : fieldNames) {
+			try {
+				java.lang.reflect.Field field = msg.getClass().getDeclaredField(name);
+				field.setAccessible(true);
+				return field.get(msg);
+			} catch (Exception ignored) {}
+		}
+		return null;
+	}
+
+	private String extractEntityTypeName(String typeStr) {
+		if (typeStr == null) return null;
+
+		if (typeStr.startsWith("entity.minecraft.")) {
+			String name = typeStr.substring("entity.minecraft.".length());
+			return "minecraft:" + name;
+		}
+
+		if (typeStr.contains("ResourceKey[minecraft:entity_type / minecraft:")) {
+			int start = typeStr.indexOf("minecraft:", typeStr.indexOf("minecraft:") + 10) + 10;
+			int end = typeStr.indexOf("]", start);
+			if (end > start) {
+				return "minecraft:" + typeStr.substring(start, end);
+			}
+		}
+
+		if (typeStr.contains("entity_type.minecraft.")) {
+			int start = typeStr.indexOf("entity_type.minecraft.") + 22;
+			int end = typeStr.length();
+			for (int i = start; i < typeStr.length(); i++) {
+				char c = typeStr.charAt(i);
+				if (!Character.isLetterOrDigit(c) && c != '_') {
+					end = i;
+					break;
+				}
+			}
+			return "minecraft:" + typeStr.substring(start, end);
+		}
+
+		if (typeStr.startsWith("minecraft:")) {
+			return typeStr;
+		}
+
+		if (typeStr.contains("minecraft:")) {
+			int start = typeStr.indexOf("minecraft:");
+			int end = typeStr.length();
+			for (int i = start + 10; i < typeStr.length(); i++) {
+				char c = typeStr.charAt(i);
+				if (!Character.isLetterOrDigit(c) && c != '_' && c != ':') {
+					end = i;
+					break;
+				}
+			}
+			return typeStr.substring(start, end);
+		}
+
+		return typeStr;
+	}
+
+	private void sendEntitySpawn(int entityId, String entityType, double x, double y, double z, float yaw, float pitch) {
+		if (!plugin.isPlayerEnabled(player.getUniqueId())) return;
+
+		int paletteIndex = entityMappingManager.getEntityIndex(entityType);
+		if (paletteIndex == -1) return;
+
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("SPAWN_ENTITY");
+		out.writeInt(entityId);
+		out.writeShort(paletteIndex);
+		out.writeDouble(x);
+		out.writeDouble(y);
+		out.writeDouble(z);
+		out.writeFloat(yaw);
+		out.writeFloat(pitch);
+
+		byte[] data = out.toByteArray();
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaEntitiesPlugin.CLIENTBOUND_CHANNEL, data);
+	}
+
+	private void sendEntityMetadata(int entityId, Object packedItems) {
+		if (!plugin.isPlayerEnabled(player.getUniqueId())) return;
+
+		try {
+			ByteArrayDataOutput out = ByteStreams.newDataOutput();
+			out.writeUTF("ENTITY_METADATA");
+			out.writeInt(entityId);
+
+			if (packedItems instanceof java.util.List) {
+				java.util.List<?> items = (java.util.List<?>) packedItems;
+				out.writeInt(items.size());
+
+				for (Object item : items) {
+					java.lang.reflect.Method getIdMethod = item.getClass().getMethod("id");
+					int metaId = (int) getIdMethod.invoke(item);
+					out.writeInt(metaId);
+
+					java.lang.reflect.Method getValueMethod = item.getClass().getMethod("value");
+					Object value = getValueMethod.invoke(item);
+
+					if (value instanceof Boolean) {
+						out.writeByte(0);
+						out.writeBoolean((Boolean) value);
+					} else if (value instanceof Integer) {
+						out.writeByte(1);
+						out.writeInt((Integer) value);
+					} else if (value instanceof Float) {
+						out.writeByte(2);
+						out.writeFloat((Float) value);
+					} else if (value instanceof String) {
+						out.writeByte(3);
+						out.writeUTF((String) value);
+					} else if (value instanceof Byte) {
+						out.writeByte(4);
+						out.writeByte((Byte) value);
+					} else {
+						out.writeByte(-1);
+					}
+				}
+			} else {
+				out.writeInt(0);
+			}
+
+			byte[] data = out.toByteArray();
+			SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaEntitiesPlugin.CLIENTBOUND_CHANNEL, data);
+		} catch (Exception e) {
+		}
+	}
+
+	private void sendEntityAnimation(int entityId, int animationType) {
+		if (!plugin.isPlayerEnabled(player.getUniqueId())) return;
+
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("ENTITY_ANIMATION");
+		out.writeInt(entityId);
+		out.writeInt(animationType);
+
+		byte[] data = out.toByteArray();
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaEntitiesPlugin.CLIENTBOUND_CHANNEL, data);
+	}
+
+	private void sendEntityDestroy(int entityId) {
+		if (!plugin.isPlayerEnabled(player.getUniqueId())) return;
+
+		ByteArrayDataOutput out = ByteStreams.newDataOutput();
+		out.writeUTF("DESTROY_ENTITY");
+		out.writeInt(entityId);
+
+		byte[] data = out.toByteArray();
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaEntitiesPlugin.CLIENTBOUND_CHANNEL, data);
+	}
+}

src/main/java/tf/tuff/viaentities/EntityInjector.java

@@ -0,0 +1,63 @@
+package tf.tuff.viaentities;
+
+import io.netty.channel.ChannelHandler;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import tf.tuff.netty.BaseInjector;
+import tf.tuff.util.SchedulerCompat;
+
+public class EntityInjector extends BaseInjector {
+
+	private final ViaEntitiesPlugin plugin;
+
+	public EntityInjector(ViaEntitiesPlugin plugin) {
+		super("viaentities_handler");
+		this.plugin = plugin;
+	}
+
+	@Override
+	protected ChannelHandler createHandler(Player player) {
+		return new EntityDataHandler(plugin, player);
+	}
+
+	@Override
+	protected void onPostInject(Player player) {
+		SchedulerCompat.runEntity(player, plugin.plugin, () -> sendExistingEntities(player));
+	}
+
+	private void sendExistingEntities(Player player) {
+		int viewDistance = player.getWorld().getViewDistance() * 16;
+
+		for (Entity entity : player.getNearbyEntities(viewDistance, viewDistance, viewDistance)) {
+			if (entity.equals(player)) continue;
+			if (entity instanceof Player) continue;
+
+			double distance = entity.getLocation().distance(player.getLocation());
+			if (distance > viewDistance) continue;
+
+			String entityType = entity.getType().getKey().toString();
+			if (plugin.entityMappingManager.isModernEntity(entityType)) {
+				sendEntityData(player, entity.getEntityId(), entityType, entity);
+			}
+		}
+	}
+
+	public void sendEntityData(Player player, int entityId, String entityType, Entity entity) {
+		if (!plugin.isPlayerEnabled(player.getUniqueId())) return;
+
+		int paletteIndex = plugin.entityMappingManager.getEntityIndex(entityType);
+		if (paletteIndex == -1) return;
+
+		com.google.common.io.ByteArrayDataOutput out = com.google.common.io.ByteStreams.newDataOutput();
+		out.writeUTF("SPAWN_ENTITY");
+		out.writeInt(entityId);
+		out.writeShort(paletteIndex);
+		out.writeDouble(entity.getLocation().getX());
+		out.writeDouble(entity.getLocation().getY());
+		out.writeDouble(entity.getLocation().getZ());
+		out.writeFloat(entity.getLocation().getYaw());
+		out.writeFloat(entity.getLocation().getPitch());
+
+		SchedulerCompat.sendPluginMessage(plugin.plugin, player, ViaEntitiesPlugin.CLIENTBOUND_CHANNEL, out.toByteArray());
+	}
+}

src/main/java/tf/tuff/viaentities/EntityMappingManager.java

@@ -0,0 +1,146 @@
+package tf.tuff.viaentities;
+
+import java.io.*;
+import java.util.*;
+import com.fasterxml.jackson.databind.*;
+
+public class EntityMappingManager {
+	private final List<String> modernEntities = new ArrayList<>();
+	private final Map<String, Integer> entityToIndex = new HashMap<>();
+	private final Set<String> modernEntitySet = new HashSet<>();
+	private final Map<String, EntityInfo> entityInfoMap = new HashMap<>();
+
+	public EntityMappingManager() {
+		loadEntityMappingsFromJSON();
+	}
+
+	private void loadEntityMappingsFromJSON() {
+		try (InputStream is = getClass().getClassLoader().getResourceAsStream("entity_mappings.json")) {
+			if (is == null) {
+				loadFallbackEntities();
+				return;
+			}
+
+			ObjectMapper mapper = new ObjectMapper();
+			JsonNode root = mapper.readTree(is);
+
+			JsonNode modernEntitiesNode = root.get("modern_entities");
+			JsonNode entitySizeNode = root.get("entity_size");
+
+			if (modernEntitiesNode != null) {
+				Iterator<Map.Entry<String, JsonNode>> fields = modernEntitiesNode.fields();
+				while (fields.hasNext()) {
+					Map.Entry<String, JsonNode> entry = fields.next();
+					String entityType = entry.getKey();
+					JsonNode info = entry.getValue();
+
+					String addedVersion = info.has("added") ? info.get("added").asText() : "1.13";
+					String model = info.has("model") && !info.get("model").isNull() ? info.get("model").asText() : null;
+					boolean animated = info.has("animated") && info.get("animated").asBoolean();
+
+					double width = 1.0;
+					double height = 1.0;
+					if (entitySizeNode != null && entitySizeNode.has(entityType)) {
+						JsonNode sizeInfo = entitySizeNode.get(entityType);
+						width = sizeInfo.has("width") ? sizeInfo.get("width").asDouble() : 1.0;
+						height = sizeInfo.has("height") ? sizeInfo.get("height").asDouble() : 1.0;
+					}
+
+					addEntity(entityType, new EntityInfo(addedVersion, model, animated, width, height));
+				}
+			}
+
+		} catch (Exception e) {
+			loadFallbackEntities();
+		}
+	}
+
+	private void loadFallbackEntities() {
+		addEntity("minecraft:allay", new EntityInfo("1.19", "allay", true, 0.35, 0.6));
+		addEntity("minecraft:axolotl", new EntityInfo("1.17", "axolotl", true, 0.75, 0.42));
+		addEntity("minecraft:bee", new EntityInfo("1.15", "bee", true, 0.7, 0.6));
+		addEntity("minecraft:camel", new EntityInfo("1.20", "camel", true, 1.7, 2.375));
+		addEntity("minecraft:cat", new EntityInfo("1.14", "cat", true, 0.6, 0.7));
+		addEntity("minecraft:fox", new EntityInfo("1.14", "fox", true, 0.6, 0.7));
+		addEntity("minecraft:frog", new EntityInfo("1.19", "frog", true, 0.5, 0.5));
+		addEntity("minecraft:goat", new EntityInfo("1.17", "goat", true, 0.9, 1.3));
+		addEntity("minecraft:hoglin", new EntityInfo("1.16", "hoglin", true, 1.4, 1.4));
+		addEntity("minecraft:piglin", new EntityInfo("1.16", "piglin", true, 0.6, 1.95));
+		addEntity("minecraft:strider", new EntityInfo("1.16", "strider", true, 0.9, 1.7));
+		addEntity("minecraft:warden", new EntityInfo("1.19", "warden", true, 0.9, 2.9));
+		addEntity("minecraft:sniffer", new EntityInfo("1.20", "sniffer", true, 1.9, 1.75));
+		addEntity("minecraft:breeze", new EntityInfo("1.21", "breeze", true, 0.6, 1.77));
+		addEntity("minecraft:wind_charge", new EntityInfo("1.21", "wind_charge", false, 0.3125, 0.3125));
+		addEntity("minecraft:breeze_wind_charge", new EntityInfo("1.21", "breeze_wind_charge", false, 0.3125, 0.3125));
+		addEntity("minecraft:armadillo", new EntityInfo("1.20.5", "armadillo", true, 0.7, 0.65));
+		addEntity("minecraft:bogged", new EntityInfo("1.21", "bogged", true, 0.6, 1.99));
+		addEntity("minecraft:phantom", new EntityInfo("1.13", "phantom", true, 0.9, 0.5));
+		addEntity("minecraft:dolphin", new EntityInfo("1.13", "dolphin", true, 0.9, 0.6));
+		addEntity("minecraft:drowned", new EntityInfo("1.13", "drowned", true, 0.6, 1.95));
+		addEntity("minecraft:cod", new EntityInfo("1.13", "cod", true, 0.5, 0.3));
+		addEntity("minecraft:salmon", new EntityInfo("1.13", "salmon", true, 0.7, 0.4));
+		addEntity("minecraft:tropical_fish", new EntityInfo("1.13", "tropical_fish", true, 0.5, 0.4));
+		addEntity("minecraft:pufferfish", new EntityInfo("1.13", "pufferfish", true, 0.7, 0.7));
+		addEntity("minecraft:turtle", new EntityInfo("1.13", "turtle", true, 1.2, 0.4));
+		addEntity("minecraft:trident", new EntityInfo("1.13", "trident", false, 0.5, 0.5));
+		addEntity("minecraft:thrown_trident", new EntityInfo("1.13", "trident", false, 0.5, 0.5));
+		addEntity("minecraft:glow_squid", new EntityInfo("1.17", "glow_squid", true, 0.8, 0.8));
+		addEntity("minecraft:glow_item_frame", new EntityInfo("1.17", "glow_item_frame", false, 0.5, 0.5));
+		addEntity("minecraft:tadpole", new EntityInfo("1.19", "tadpole", true, 0.4, 0.3));
+		addEntity("minecraft:chest_boat", new EntityInfo("1.19", "chest_boat", false, 1.375, 0.5625));
+		addEntity("minecraft:piglin_brute", new EntityInfo("1.16", "piglin_brute", true, 0.6, 1.95));
+		addEntity("minecraft:zoglin", new EntityInfo("1.16", "zoglin", true, 1.4, 1.4));
+	}
+
+	private void addEntity(String entityType, EntityInfo info) {
+		if (!entityToIndex.containsKey(entityType)) {
+			entityToIndex.put(entityType, modernEntities.size());
+			modernEntities.add(entityType);
+			modernEntitySet.add(entityType);
+			entityInfoMap.put(entityType, info);
+		}
+	}
+
+	public boolean isModernEntity(String entityType) {
+		return modernEntitySet.contains(entityType);
+	}
+
+	public int getEntityIndex(String entityType) {
+		return entityToIndex.getOrDefault(entityType, -1);
+	}
+
+	public String getEntityByIndex(int index) {
+		if (index >= 0 && index < modernEntities.size()) {
+			return modernEntities.get(index);
+		}
+		return null;
+	}
+
+	public EntityInfo getEntityInfo(String entityType) {
+		return entityInfoMap.get(entityType);
+	}
+
+	public List<String> getAllModernEntities() {
+		return Collections.unmodifiableList(modernEntities);
+	}
+
+	public int getModernEntityCount() {
+		return modernEntities.size();
+	}
+
+	public static class EntityInfo {
+		public final String addedVersion;
+		public final String model;
+		public final boolean animated;
+		public final double width;
+		public final double height;
+
+		public EntityInfo(String addedVersion, String model, boolean animated, double width, double height) {
+			this.addedVersion = addedVersion;
+			this.model = model;
+			this.animated = animated;
+			this.width = width;
+			this.height = height;
+		}
+	}
+}

src/main/java/tf/tuff/viaentities/ViaEntitiesPlugin.java

@@ -0,0 +1,138 @@
+package tf.tuff.viaentities;
+
+import tf.tuff.TuffX;
+import org.bukkit.entity.Player;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+import java.util.logging.Level;
+
+import tf.tuff.util.SchedulerCompat;
+
+public final class ViaEntitiesPlugin {
+
+	public static final String CLIENTBOUND_CHANNEL = "viaentities:data";
+	public static final String SERVERBOUND_CHANNEL = "entities:handshake";
+
+	public final Set<UUID> viaEntitiesEnabledPlayers = new HashSet<>();
+
+	static ViaEntitiesPlugin instance;
+
+	public EntityMappingManager entityMappingManager;
+	private EntityInjector entityInjector;
+	private boolean enabled = true;
+	private boolean debug = false;
+	private int maxDistance = -1;
+
+	public TuffX plugin;
+
+	public ViaEntitiesPlugin(TuffX plugin) {
+		this.plugin = plugin;
+		plugin.getConfig().addDefault("viaentities.viaentities-enabled", true);
+		plugin.getConfig().addDefault("viaentities.debug", false);
+		plugin.getConfig().addDefault("viaentities.max-distance", -1);
+	}
+
+	public void onTuffXReload() {
+		loadConfig();
+	}
+
+	private void loadConfig() {
+		enabled = plugin.getConfig().getBoolean("viaentities.viaentities-enabled");
+		debug = plugin.getConfig().getBoolean("viaentities.debug");
+		maxDistance = plugin.getConfig().getInt("viaentities.max-distance");
+	}
+
+	public boolean isDebug() {
+		return debug;
+	}
+
+	public void debug(String message) {
+		if (isDebug()) info(message);
+	}
+
+	public void log(Level level, String msg) {
+		plugin.getLogger().log(level, "[ViaEntities] "+msg);
+	}
+	public void info(String msg) {
+		log(Level.INFO, msg);
+	}
+
+	public void onTuffXEnable() {
+		instance = this;
+
+		loadConfig();
+
+		this.entityMappingManager = new EntityMappingManager();
+		this.entityInjector = new EntityInjector(this);
+
+		plugin.getServer().getMessenger().registerOutgoingPluginChannel(plugin, CLIENTBOUND_CHANNEL);
+		plugin.getServer().getMessenger().registerIncomingPluginChannel(plugin, SERVERBOUND_CHANNEL, plugin);
+
+		if (enabled) {
+			info("ViaEntities enabled with " + entityMappingManager.getModernEntityCount() + " modern entities");
+		} else {
+			info("ViaEntities disabled in config");
+		}
+	}
+
+	public boolean isEnabled() {
+		return enabled;
+	}
+
+	public int getMaxDistance() {
+		return maxDistance;
+	}
+
+	public void handlePacket(Player player, byte[] message) {
+		if (!enabled) return;
+		if (!isPlayerEnabled(player.getUniqueId())) {
+			debug("Received handshake from " + player.getName());
+			setPlayerEnabled(player.getUniqueId(), true);
+			entityInjector.inject(player);
+			sendPaletteToClient(player);
+			debug("Sent palette with " + entityMappingManager.getModernEntityCount() + " entities to " + player.getName());
+		}
+	}
+
+	private void sendPaletteToClient(Player player) {
+		com.google.common.io.ByteArrayDataOutput out = com.google.common.io.ByteStreams.newDataOutput();
+		out.writeUTF("INIT_PALETTE");
+
+		java.util.List<String> palette = entityMappingManager.getAllModernEntities();
+		out.writeInt(palette.size());
+
+		for (String entityType : palette) {
+			out.writeUTF(entityType);
+		}
+
+		SchedulerCompat.sendPluginMessage(plugin, player, CLIENTBOUND_CHANNEL, out.toByteArray());
+	}
+
+	public void handlePlayerQuit(org.bukkit.event.player.PlayerQuitEvent event) {
+		entityInjector.eject(event.getPlayer());
+		viaEntitiesEnabledPlayers.remove(event.getPlayer().getUniqueId());
+	}
+
+	public void onTuffXDisable() {
+		plugin.getServer().getMessenger().unregisterOutgoingPluginChannel(plugin, CLIENTBOUND_CHANNEL);
+		plugin.getServer().getMessenger().unregisterIncomingPluginChannel(plugin, SERVERBOUND_CHANNEL);
+	}
+
+	public boolean isPlayerEnabled(UUID playerId) {
+		return viaEntitiesEnabledPlayers.contains(playerId);
+	}
+
+	public void setPlayerEnabled(UUID playerId, boolean enabled) {
+		if (enabled) {
+			viaEntitiesEnabledPlayers.add(playerId);
+		} else {
+			viaEntitiesEnabledPlayers.remove(playerId);
+		}
+	}
+
+	public EntityInjector getEntityInjector() {
+		return entityInjector;
+	}
+}

src/main/java/tf/tuff/y0/ChunkPacketListener.java

@@ -0,0 +1,29 @@
+package tf.tuff.y0;
+
+import tf.tuff.TuffX;
+
+import org.bukkit.Chunk;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+import tf.tuff.util.SchedulerCompat;
+
+public class ChunkPacketListener {
+
+	public final Y0Plugin plugin;
+
+	public ChunkPacketListener(Y0Plugin plugin) {
+		this.plugin = plugin;
+	}
+
+	public void handleChunk(TuffX plugin, Player player, World world, int chunkX, int chunkZ){
+		if (!this.plugin.isPlayerReady(player)) return;
+
+		SchedulerCompat.runRegion(plugin, world, chunkX, chunkZ, () -> {
+			if (player.isOnline() && world.isChunkLoaded(chunkX, chunkZ)) {
+				Chunk chunk = world.getChunkAt(chunkX, chunkZ);
+				this.plugin.processAndSendChunk(player, chunk);
+			}
+		});
+	}
+}

src/main/java/tf/tuff/y0/ViaBlockIds.java

@@ -0,0 +1,345 @@
+package tf.tuff.y0;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import javax.annotation.Nonnull;
+
+import org.bukkit.Bukkit;
+import org.bukkit.block.Block;
+import org.bukkit.block.data.BlockData;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.api.protocol.ProtocolPathEntry;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import tf.tuff.TuffX;
+import tf.tuff.util.SchedulerCompat;
+
+public class ViaBlockIds {
+	private final TuffX p;
+	private final Y0Plugin plugin;
+	private final String serverVersion;
+	private final File mappingsFile;
+	private Object2ObjectOpenHashMap<String, int[]> legacyMappings = new Object2ObjectOpenHashMap<>();
+
+	public ViaBlockIds(TuffX pl) {
+		p = pl;
+		plugin = pl.y0Plugin;
+		serverVersion = getServerMCVersion();
+		mappingsFile = new File(pl.getDataFolder(), serverVersion + "-mappings.json");
+
+		plugin.info("Server Minecraft Version: " + serverVersion);
+
+		SchedulerCompat.runGlobalLater(pl, this::initializeMappings, 1L);
+	}
+
+	private void initializeMappings() {
+		try {
+			if (Via.getAPI() == null) {
+				plugin.severe("ViaVersion API not found! Is ViaVersion installed?");
+				return;
+			}
+		} catch (IllegalArgumentException e) {
+			plugin.severe("ViaVersion API not found! Is ViaVersion installed?");
+			return;
+		}
+
+		if (!mappingsFile.exists()) {
+			plugin.info("Mapping file not found, generating...");
+			if (!p.getDataFolder().exists()) {
+				p.getDataFolder().mkdirs();
+			}
+			generateMappings();
+		} else {
+			plugin.info("Loading mappings from " + mappingsFile.getName());
+			loadMappings();
+		}
+	}
+
+	private static final int[] DEFAULT_LEGACY = {1, 0};
+
+	public int[] toLegacy(String k) {
+		int[] result = legacyMappings.get(k);
+		return result != null ? result : DEFAULT_LEGACY;
+	}
+
+	public int[] toLegacy(BlockData bd) {
+		org.bukkit.Material mat = bd.getMaterial();
+
+		if (mat == org.bukkit.Material.CHEST) {
+			return new int[] {54, getLegacyChestMeta(bd)};
+		}
+
+		if (mat == org.bukkit.Material.TRAPPED_CHEST) {
+			return new int[] {146, getLegacyChestMeta(bd)};
+		}
+
+		if (mat == org.bukkit.Material.ENDER_CHEST) {
+			return new int[] {130, getLegacyChestMeta(bd)};
+		}
+
+		String k = bd.getAsString();
+
+		if (k.startsWith("minecraft:")) {
+			k = k.substring(10);
+		}
+
+		return toLegacy(k);
+	}
+
+	private int getLegacyChestMeta(BlockData bd) {
+		if (bd instanceof org.bukkit.block.data.Directional directional) {
+			org.bukkit.block.BlockFace face = directional.getFacing();
+
+			switch (face) {
+				case NORTH:
+					return 2;
+				case SOUTH:
+					return 3;
+				case WEST:
+					return 4;
+				case EAST:
+					return 5;
+				default:
+					return 3;
+			}
+		}
+
+		String s = bd.getAsString();
+
+		if (s.contains("facing=north")) {
+			return 2;
+		}
+
+		if (s.contains("facing=south")) {
+			return 3;
+		}
+
+		if (s.contains("facing=west")) {
+			return 4;
+		}
+
+		if (s.contains("facing=east")) {
+			return 5;
+		}
+
+		return 3;
+	}
+
+	public int[] toLegacy(Block b) {
+		return toLegacy(b.getBlockData());
+	}
+
+	private String getServerMCVersion() {
+		String vs = Bukkit.getServer().getVersion();
+		int mi = vs.indexOf("MC: ");
+		if (mi != -1) {
+			int ei = vs.indexOf(')', mi);
+			return ei != -1 ? vs.substring(mi + 4, ei) : vs.substring(mi + 4);
+		}
+		plugin.log(Level.WARNING, "Could not detect Minecraft version. Defaulting to 1.21.");
+		return "1.21";
+	}
+
+	public static record MappingFile (String version, InputStream stream) {}
+
+	public @Nonnull MappingFile findMappingFile(String serverVers) {
+		String[] vp = serverVers.split("\\.");
+
+		int maj, min, pat;
+		try {
+			maj = Integer.parseInt(vp[0]);
+			min = Integer.parseInt(vp[1]);
+			pat = vp.length > 2 ? Integer.parseInt(vp[2]) : 0;
+		} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+			plugin.severe("Could not parse server version string: " + serverVers);
+			return new MappingFile(serverVers, p.getResource("mapping-" + serverVers + ".json"));
+		}
+
+		plugin.info("Searching for mappings, starting from " + serverVers + " and going down.");
+
+		for (int m = min; m >= 0; m--) {
+			int sp = (m == min) ? pat : 11; // if on correct minor version, start from patch, otherwise start from highest possible patch
+
+			for (int pt = sp; pt >= 0; pt--) {
+				String vtt = maj + "." + m + "." + pt;
+				String fileName = "mapping-" + vtt + ".json";
+
+				InputStream inpStream = p.getResource(fileName);
+
+				if (inpStream != null) {
+					if (!vtt.equals(serverVers)) {
+						plugin.info("Using fallback mapping file: " + fileName);
+					} else {
+						plugin.info("Found exact mapping file: " + fileName);
+					}
+					return new MappingFile(vtt, inpStream);
+				}
+			}
+
+        	// Check for the major.min version without patch
+			String fileName = "mapping-" + maj + "." + m + ".json";
+			InputStream inpStream = p.getResource(fileName);
+			if (inpStream != null) {
+				plugin.info("Using fallback mapping file: " + fileName);
+				return  new MappingFile(maj + "." + m, inpStream);
+			}
+
+			// Switch to 1.21.x versions after 26.0
+			if (maj >= 26 && m == 0) {
+				maj = 1;
+				m = 22; // will be 21 in the next iteration
+			}
+		}
+
+		plugin.severe("Could not find any suitable mapping file after checking all versions down to 1.0.0");
+		return new MappingFile(serverVers, null);
+	}
+
+	private void generateMappings() {
+		try {
+			MappingFile mapFile = findMappingFile(serverVersion);
+			if (mapFile.stream == null) {
+				plugin.severe("Failed to find mapping file for " + serverVersion + " in plugin resources!");
+				return;
+			}
+
+			ObjectMapper mapper = new ObjectMapper();
+			@SuppressWarnings("unchecked")
+			Map<String, Object> r = mapper.readValue(mapFile.stream, Map.class);
+			mapFile.stream.close();
+			@SuppressWarnings("unchecked")
+			List<String> states = (List<String>) r.get("blockstates");
+
+			if (states == null) {
+				plugin.severe("'blockstates' key not found in JSON.");
+				return;
+			}
+
+			Object2ObjectOpenHashMap<String, int[]> newLegacyMappings = new Object2ObjectOpenHashMap<>();
+			plugin.info("Generating legacy mappings for " + states.size() + " block states...");
+
+			ProtocolVersion serverProto = ProtocolVersion.getClosest(mapFile.version); // start from base mappings file version
+			ProtocolVersion clientProto = ProtocolVersion.v1_12_2;
+
+			List<ProtocolPathEntry> protoPath = Via.getManager()
+				.getProtocolManager()
+				.getProtocolPath(clientProto, serverProto);
+
+			if (protoPath == null) {
+				plugin.log(Level.SEVERE, "Protocol path is null!");
+				return;
+			}
+
+			for (int i = 0; i < states.size(); i++) {
+				String k = states.get(i).replace("minecraft:", "");
+				String blockName = k.contains("[") ? k.substring(0, k.indexOf("[")) : k;
+
+				int[] legacy;
+
+				switch (blockName) {
+					case "chest":
+						legacy = new int[]{54, 0};
+						break;
+					case "ender_chest":
+						legacy = new int[]{130, 0};
+						break;
+					case "trapped_chest":
+						legacy = new int[]{146, 0};
+						break;
+					default:
+						legacy = convertToLegacy(protoPath, i);
+						break;
+				}
+
+				newLegacyMappings.put(k, legacy);
+			}
+
+			legacyMappings = newLegacyMappings;
+
+			Map<String, Object> outputMap = new Object2ObjectOpenHashMap<>();
+			outputMap.put("blockstates", legacyMappings);
+
+			mappingsFile.getParentFile().mkdirs();
+			mapper.writerWithDefaultPrettyPrinter().writeValue(mappingsFile, outputMap);
+			plugin.info("Successfully wrote mappings to " + mappingsFile.getName());
+
+		} catch (Exception e) {
+			plugin.log(Level.SEVERE, "Error generating legacy mappings.", e);
+		}
+	}
+
+	private void loadMappings() {
+		try {
+			ObjectMapper mapper = new ObjectMapper();
+			@SuppressWarnings("unchecked")
+			Map<String, Object> r = mapper.readValue(mappingsFile, Map.class);
+			@SuppressWarnings("unchecked")
+			Map<String, List<Integer>> readMap = (Map<String, List<Integer>>) r.get("blockstates");
+
+			if (readMap == null) {
+				plugin.severe("Invalid format in mappings file. Regenerating...");
+				generateMappings();
+				return;
+			}
+
+			legacyMappings = new Object2ObjectOpenHashMap<>();
+			for (Map.Entry<String, List<Integer>> e : readMap.entrySet()) {
+				String fullKey = e.getKey();
+				List<Integer> ll = e.getValue();
+
+				if (ll != null && ll.size() == 2) {
+					String blockName = fullKey.contains("[") ? fullKey.substring(0, fullKey.indexOf("[")) : fullKey;
+					int[] finalId;
+
+					switch (blockName) {
+						case "chest":
+							finalId = new int[]{54, 0};
+							break;
+						case "ender_chest":
+							finalId = new int[]{130, 0};
+							break;
+						case "trapped_chest":
+							finalId = new int[]{146, 0};
+							break;
+						default:
+							finalId = new int[]{ll.get(0), ll.get(1)};
+							break;
+					}
+					legacyMappings.put(fullKey, finalId);
+				}
+			}
+			plugin.info("Loaded " + legacyMappings.size() + " legacy mappings.");
+		} catch (IOException e) {
+			plugin.log(Level.SEVERE, "Failed to load mappings file.", e);
+		}
+	}
+
+	public int[] convertToLegacy(List<ProtocolPathEntry> protoPath, int stateId) {
+		for (int i = protoPath.size() - 1; i >= 0; i--) {
+			ProtocolPathEntry entry = protoPath.get(i);
+			Protocol<?, ?, ?, ?> protocol = entry.protocol();
+
+			if (protocol instanceof BackwardsProtocol) {
+				BackwardsMappingData mappingData = ((BackwardsProtocol<?, ?, ?, ?>) protocol).getMappingData();
+				if (mappingData != null && mappingData.getBlockStateMappings() != null) {
+					int newStateId = mappingData.getBlockStateMappings().getNewId(stateId);
+
+					if (newStateId != -1) stateId = newStateId;
+				}
+			}
+		}
+		int blockId = stateId >> 4;
+		int blockMetadata = stateId & 0xF;
+		return new int[]{blockId, blockMetadata};
+	}
+}

src/main/java/tf/tuff/y0/Y0Plugin.java

@@ -0,0 +1,931 @@
+package tf.tuff.y0;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+import javax.annotation.Nonnull;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Chunk;
+import org.bukkit.ChunkSnapshot;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.entity.Player;
+import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.event.block.BlockExplodeEvent;
+import org.bukkit.event.block.BlockFromToEvent;
+import org.bukkit.event.block.BlockPhysicsEvent;
+import org.bukkit.event.block.BlockPlaceEvent;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.world.ChunkLoadEvent;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
+import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
+
+import tf.tuff.TuffX;
+import tf.tuff.netty.ChunkInjector;
+import tf.tuff.util.SchedulerCompat;
+
+public class Y0Plugin {
+
+	public static final String CHANNEL = "eagler:below_y0";
+	public ViaBlockIds viaIds;
+
+	private ObjectOpenHashSet<String> enabledWorlds;
+	private boolean debug;
+	private int processorThreadCount;
+	private int cacheSize;
+	private int cacheExp;
+	private int concLevel;
+	private boolean kickOutdatedClients;
+
+	private final Set<UUID> readyPlayers = ConcurrentHashMap.newKeySet();
+	private volatile Cache<WorldChunk, ObjectArrayList<byte[]>> chunkCache;
+	private volatile Cache<WorldChunk, byte[]> chunkCacheCombined;
+	private volatile ExecutorService chunkProcessor;
+
+	private final ThreadLocal<Object2ObjectOpenHashMap<BlockData, int[]>> threadChunkData = ThreadLocal.withInitial(() -> new Object2ObjectOpenHashMap<>(256));
+	private final ThreadLocal<ByteArrayOutputStream> threadOut = ThreadLocal.withInitial(() -> new ByteArrayOutputStream(8256));
+	private final ThreadLocal<byte[]> threadData = ThreadLocal.withInitial(() -> new byte[12288]);
+
+	private TuffX plugin;
+
+	private static final int[] EMPTY_LEGACY = {1, 0};
+
+	private static final Map<BlockData, Integer> emissionCache = new ConcurrentHashMap<>();
+	private static Method getLightEmissionMethod;
+
+	public ChunkPacketListener chunkPacketListener;
+	private ChunkInjector chunkInjector;
+
+	static {
+		try {
+			getLightEmissionMethod = BlockData.class.getMethod("getLightEmission");
+			getLightEmissionMethod.setAccessible(true);
+		} catch (NoSuchMethodException e) {
+			getLightEmissionMethod = null;
+		}
+	}
+
+	private static final Map<Material, Integer> legacy_light_map = Map.ofEntries(
+		Map.entry(Material.TORCH, 14),
+		Map.entry(Material.SOUL_TORCH, 10),
+		Map.entry(Material.LANTERN, 15),
+		Map.entry(Material.SOUL_LANTERN, 10),
+		Map.entry(Material.GLOWSTONE, 15),
+		Map.entry(Material.SEA_LANTERN, 15),
+		Map.entry(Material.REDSTONE_LAMP, 15),
+		Map.entry(Material.SHROOMLIGHT, 15),
+		Map.entry(Material.CAMPFIRE, 15),
+		Map.entry(Material.SOUL_CAMPFIRE, 10),
+		Map.entry(Material.END_ROD, 14),
+		Map.entry(Material.MAGMA_BLOCK, 3),
+		Map.entry(Material.FIRE, 15),
+		Map.entry(Material.SOUL_FIRE, 10),
+		Map.entry(Material.CANDLE, 3),
+		Map.entry(Material.WHITE_CANDLE, 3),
+		Map.entry(Material.CAKE, 0),
+		Map.entry(Material.CANDLE_CAKE, 3)
+	);
+
+	public Y0Plugin(TuffX plugin){
+		this.plugin = plugin;
+	}
+
+	private void debug(String m) {
+		if (debug) plugin.getLogger().info("[Y0-Debug] " + m);
+	}
+
+	public void log(Level level, String msg, Throwable e) {
+		plugin.getLogger().log(level, "[Y0] "+msg, e);
+	}
+	public void log(Level level, String msg) {
+		plugin.getLogger().log(level, "[Y0] "+msg);
+	}
+	public void info(String msg) {
+		log(Level.INFO, msg);
+	}
+	public void severe(String msg) {
+		log(Level.SEVERE, msg);
+	}
+
+	public record WorldChunk(String w, int x, int z) {}
+
+	private void loadConfig() {
+		debug = plugin.getConfig().getBoolean("y0.debug-mode");
+
+		ObjectArrayList<String> ewList = new ObjectArrayList<>(plugin.getConfig().getStringList("y0.enabled-worlds"));
+		enabledWorlds = new ObjectOpenHashSet<>(ewList.size());
+		if (plugin.getConfig().getBoolean("y0.y0-enabled")) enabledWorlds.addAll(ewList);
+
+		int threadSetting = plugin.getConfig().getInt("y0.chunk-processor-threads");
+		if (threadSetting <= 0) {
+			processorThreadCount = Math.max(1, Runtime.getRuntime().availableProcessors() / 2);
+		} else {
+			processorThreadCount = threadSetting;
+		}
+		
+		cacheSize = plugin.getConfig().getInt("y0.cache-size");
+		cacheExp = plugin.getConfig().getInt("y0.cache-expiration");
+		concLevel = Runtime.getRuntime().availableProcessors();
+		kickOutdatedClients = plugin.getConfig().getBoolean("y0.kick-outdated-clients");
+	}
+
+	private void startup() {
+		loadConfig();
+
+		chunkCache = CacheBuilder.newBuilder()
+			.maximumSize(cacheSize)
+			.expireAfterAccess(cacheExp, TimeUnit.MINUTES)
+			.concurrencyLevel(concLevel)
+			.initialCapacity(256)
+			.build();
+		chunkCacheCombined = CacheBuilder.newBuilder()
+			.maximumSize(cacheSize)
+			.expireAfterAccess(cacheExp, TimeUnit.MINUTES)
+			.concurrencyLevel(concLevel)
+			.initialCapacity(256)
+			.build();
+
+		chunkProcessor = Executors.newFixedThreadPool(processorThreadCount, run -> {
+			Thread thread = new Thread(run, "TuffX-Chunk-" + System.nanoTime());
+			thread.setDaemon(true);
+			thread.setPriority(Thread.NORM_PRIORITY - 1);
+			return thread;
+		});
+	}
+
+	private void shutdown() {
+		if (chunkCache != null) {
+			chunkCache.invalidateAll();
+		}
+		if (chunkCacheCombined != null) {
+			chunkCacheCombined.invalidateAll();
+		}
+
+		if (chunkProcessor != null) {
+			chunkProcessor.shutdown();
+			try {
+				if (!chunkProcessor.awaitTermination(10, TimeUnit.SECONDS)) {
+					chunkProcessor.shutdownNow();
+					if (!chunkProcessor.awaitTermination(5, TimeUnit.SECONDS)) {
+						severe("Failed to shutdown chunk processor pool!");
+					}
+				}
+			} catch (InterruptedException e) {
+				chunkProcessor.shutdownNow();
+				Thread.currentThread().interrupt();
+			} finally {
+				chunkProcessor = null;
+			}
+		}
+
+	}
+
+	public void onTuffXReload() {
+		loadConfig();
+
+		shutdown();
+		startup();
+
+		emissionCache.clear();
+
+		info("Y0 reloaded.");
+	}
+
+	public void forceClearCache() {
+		if (chunkCache != null) {
+			chunkCache.invalidateAll();
+			chunkCache.cleanUp();
+		}
+
+		if (chunkCacheCombined != null) {
+			chunkCacheCombined.invalidateAll();
+			chunkCacheCombined.cleanUp();
+		}
+
+		emissionCache.clear();
+	}
+
+	public void onTuffXEnable() {
+		plugin.getConfig().addDefault("y0.y0-enabled", true);
+		plugin.getConfig().addDefault("y0.debug-mode", false);
+		plugin.getConfig().addDefault("y0.enabled-worlds", new ArrayList<>(java.util.Collections.singletonList("world")));
+		plugin.getConfig().addDefault("y0.chunk-processor-threads", 3);
+		plugin.getConfig().addDefault("y0.cache-size", 192);
+		plugin.getConfig().addDefault("y0.cache-expiration", 2);
+		plugin.getConfig().addDefault("y0.kick-outdated-clients", true);
+		plugin.getConfig().options().copyDefaults(true);
+
+		startup();
+
+		this.chunkPacketListener = new ChunkPacketListener(this);
+
+		plugin.getServer().getMessenger().registerOutgoingPluginChannel(plugin, CHANNEL);
+		plugin.getServer().getMessenger().registerIncomingPluginChannel(plugin, CHANNEL, plugin);
+
+		if (viaIds == null) viaIds = new ViaBlockIds(this.plugin);
+	}
+
+	public record Coords(int x, int y, int z) {}
+
+	public void onTuffXDisable() {
+		shutdown();
+
+		readyPlayers.clear();
+
+		if (viaIds != null) viaIds = null;
+	}
+
+	public boolean isPlayerReady(Player player) {
+		if (player == null) return false;
+		return readyPlayers.contains(player.getUniqueId());
+	}
+
+	public void setChunkInjector(ChunkInjector injector) {
+		if (injector == null) return;
+		this.chunkInjector = injector;
+	}
+
+	public void handlePacket(Player player, byte[] data) {
+		try (DataInputStream i = new DataInputStream(new ByteArrayInputStream(data))) {
+			i.readInt();
+			i.readInt();
+			i.readInt();
+			int al = i.readUnsignedByte();
+			byte[] ab = new byte[al];
+			i.readFully(ab);
+			String subchannel = new String(ab, StandardCharsets.UTF_8);
+			handlePacket(player, subchannel);
+		} catch (IOException e) {
+			log(Level.WARNING, "Failed to parse plugin message from " + player.getName() + ": " + e.getMessage());
+		}
+	}
+
+	private void handlePacket(Player player, String subchannel) {
+		if (!enabledWorlds.contains(player.getWorld().getName()) && !subchannel.equalsIgnoreCase("ready")) {
+			SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, y0StatusPkt(false));
+			return;
+		}
+
+		switch (subchannel.toLowerCase()) {
+			case "ready2":
+				debug("Player " + player.getName() + " is READY.");
+				readyPlayers.add(player.getUniqueId());
+				if (enabledWorlds.contains(player.getWorld().getName())) {
+					readyPlayers.add(player.getUniqueId());
+					preCacheVisibleChunks(player);
+					if (chunkInjector != null) {
+						chunkInjector.inject(player);
+					}
+					SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, y0StatusPkt(true));
+					resendChunksInView(player);
+				} else {
+					SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, y0StatusPkt(false));
+				}
+				break;
+			case "use_on_block":
+				break;
+			case "ready":
+				if (kickOutdatedClients) {
+					player.kickPlayer("§cYour client is not compatible with the version of §6TuffX§c the server has installed!\n§7Please update your client.");
+				}
+		}
+	}
+
+	private void preCacheVisibleChunks(Player player) {
+		World world = player.getWorld();
+		int viewDistance = player.getClientViewDistance();
+		int playerChunkX = player.getLocation().getChunk().getX();
+		int playerChunkZ = player.getLocation().getChunk().getZ();
+
+		Object2ObjectOpenHashMap<BlockData, int[]> cvt = new Object2ObjectOpenHashMap<>(256);
+
+		for (int x = -viewDistance; x <= viewDistance; x++) {
+			for (int z = -viewDistance; z <= viewDistance; z++) {
+				int currentChunkX = playerChunkX + x;
+				int currentChunkZ = playerChunkZ + z;
+
+				if (world.isChunkLoaded(currentChunkX, currentChunkZ)) {
+					WorldChunk k = new WorldChunk(world.getName(), currentChunkX, currentChunkZ);
+					if (chunkCache.getIfPresent(k) == null) {
+						try {
+							Chunk chunk = world.getChunkAt(currentChunkX, currentChunkZ);
+							ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+							ObjectArrayList<byte[]> pp = new ObjectArrayList<>(4);
+							cvt.clear();
+
+							for (int sy = -4; sy < 0; sy++) {
+								byte[] sectionData = createSectionPayload(snapshot, currentChunkX, currentChunkZ, sy, cvt);
+								if (sectionData != null) {
+									pp.add(sectionData);
+								}
+							}
+
+							chunkCache.put(k, pp);
+							storeCombined(k, pp);
+						} catch (Exception e) { debug("Exception while pre-caching visible chunks for player "+player.getName()+": "+e.getMessage()); }
+					}
+				}
+			}
+		}
+	}
+
+	private static final int Y0_CHUNKS_PER_TICK = 8;
+
+	public void resendChunksInView(Player player) {
+		World world = player.getWorld();
+		int viewDistance = player.getClientViewDistance();
+		int playerChunkX = player.getLocation().getChunk().getX();
+		int playerChunkZ = player.getLocation().getChunk().getZ();
+
+		List<int[]> chunks = new ArrayList<>();
+		for (int x = -viewDistance; x <= viewDistance; x++) {
+			for (int z = -viewDistance; z <= viewDistance; z++) {
+				int currentChunkX = playerChunkX + x;
+				int currentChunkZ = playerChunkZ + z;
+
+				if (world.isChunkLoaded(currentChunkX, currentChunkZ)) {
+					chunks.add(new int[]{currentChunkX, currentChunkZ, x * x + z * z});
+				}
+			}
+		}
+
+		chunks.sort((a, b) -> Integer.compare(a[2], b[2]));
+
+		sendY0ChunksBatched(player, world.getName(), chunks, 0);
+	}
+
+	private void sendY0ChunksBatched(Player player, String worldName, List<int[]> chunks, int startIndex) {
+		if (!player.isOnline() || startIndex >= chunks.size()) return;
+
+		int endIndex = Math.min(startIndex + Y0_CHUNKS_PER_TICK, chunks.size());
+		for (int i = startIndex; i < endIndex; i++) {
+			int[] chunk = chunks.get(i);
+			WorldChunk k = new WorldChunk(worldName, chunk[0], chunk[1]);
+			ObjectArrayList<byte[]> cachedData = chunkCache.getIfPresent(k);
+			if (cachedData != null && !cachedData.isEmpty()) {
+				for (byte[] py : cachedData) {
+					SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, py);
+				}
+			}
+		}
+
+		if (endIndex < chunks.size()) {
+			final int nextStart = endIndex;
+			if (player.isOnline()) {
+				SchedulerCompat.runEntityLater(player, plugin, () -> sendY0ChunksBatched(player, worldName, chunks, nextStart), 1L);
+			}
+		}
+	}
+
+	private byte[] y0StatusPkt(boolean s) {
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream();
+			 DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("y0_status");
+			out.writeBoolean(s);
+			return bout.toByteArray();
+		} catch (IOException e) { return null; }
+	}
+
+	private byte[] dimensionChangePkt() {
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream();
+			 DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("dimension_change");
+			return bout.toByteArray();
+		} catch (IOException e) { return null; }
+	}
+
+	public void handlePlayerChangeWorld(PlayerChangedWorldEvent event) {
+		Player player = event.getPlayer();
+		SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, dimensionChangePkt());
+		boolean isEnabledWorld = enabledWorlds.contains(player.getWorld().getName());
+		SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, y0StatusPkt(isEnabledWorld));
+		if (isPlayerReady(player) && isEnabledWorld) {
+			resendChunksInView(player);
+		}
+	}
+
+	public void handlePlayerJoin(PlayerJoinEvent event) {
+		Player player = event.getPlayer();
+		SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, dimensionChangePkt());
+		boolean isEnabledWorld = enabledWorlds.contains(player.getWorld().getName());
+		SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, y0StatusPkt(isEnabledWorld));
+	}
+
+	public void processAndSendChunk(final Player player, final Chunk c) {
+		if (c == null || player == null || !player.isOnline()) return;
+		if (!c.getWorld().equals(player.getWorld())) return;
+
+		if (enabledWorlds != null && !enabledWorlds.contains(c.getWorld().getName())) return;
+
+		final WorldChunk k = new WorldChunk(c.getWorld().getName(), c.getX(), c.getZ());
+		ObjectArrayList<byte[]> cachedData = chunkCache.getIfPresent(k);
+		if (cachedData != null) {
+			if (player.isOnline() && c.getWorld().equals(player.getWorld())) {
+				for (byte[] py : cachedData) {
+					SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, py);
+				}
+			}
+			return;
+		}
+
+		final ChunkSnapshot snapshot = c.getChunkSnapshot(false, false, false);
+		processSnapshotAsync(player, snapshot, c.getX(), c.getZ());
+	}
+
+	private void processSnapshotAsync(final Player player, final ChunkSnapshot snapshot, final int chunkX, final int chunkZ) {
+		ExecutorService executor = chunkProcessor;
+		if (executor == null || executor.isShutdown()) return;
+
+		final WorldChunk k = new WorldChunk(snapshot.getWorldName(), chunkX, chunkZ);
+
+		executor.submit(() -> {
+			final ObjectArrayList<byte[]> pp = new ObjectArrayList<>(4);
+			final Object2ObjectOpenHashMap<BlockData, int[]> cvt = threadChunkData.get();
+			cvt.clear();
+			for (int sy = -4; sy < 0; sy++) {
+				if (!player.isOnline()) {
+					return;
+				}
+				try {
+					byte[] py = createSectionPayload(snapshot, chunkX, chunkZ, sy, cvt);
+					if (py != null) {
+						pp.add(py);
+					}
+				} catch (IOException e) {
+					severe("Payload creation failed: " + e.getMessage());
+				}
+			}
+			chunkCache.put(k, pp);
+			storeCombined(k, pp);
+			if (!pp.isEmpty()) {
+				for (byte[] py : pp) {
+					SchedulerCompat.sendPluginMessage(plugin, player, CHANNEL, py);
+				}
+			}
+		});
+	}
+
+	private void invalidateChunkCache(World w, int x, int z) {
+		WorldChunk k = new WorldChunk(w.getName(), x >> 4, z >> 4);
+		chunkCache.invalidate(k);
+		chunkCacheCombined.invalidate(k);
+	}
+
+	public byte[] getY0DataForChunk(Player player, int chunkX, int chunkZ) {
+		if (!isPlayerReady(player)) return null;
+		World world = player.getWorld();
+		if (enabledWorlds == null || !enabledWorlds.contains(world.getName())) return null;
+
+		WorldChunk k = new WorldChunk(world.getName(), chunkX, chunkZ);
+
+		byte[] combined = chunkCacheCombined.getIfPresent(k);
+		if (combined != null) return combined.length > 0 ? combined : null;
+
+		ObjectArrayList<byte[]> cachedData = chunkCache.getIfPresent(k);
+		if (cachedData != null) {
+			byte[] cb = buildCombined(cachedData);
+			if (cb != null) chunkCacheCombined.put(k, cb);
+			return cb;
+		}
+
+		return null;
+	}
+
+	private byte[] buildCombined(ObjectArrayList<byte[]> sections) {
+		if (sections.isEmpty()) return null;
+		int totalLen = 0;
+		for (int i = 0, l = sections.size(); i < l; i++) {
+			totalLen += sections.get(i).length;
+		}
+		byte[] result = new byte[totalLen];
+		int offset = 0;
+		for (int i = 0, l = sections.size(); i < l; i++) {
+			byte[] s = sections.get(i);
+			System.arraycopy(s, 0, result, offset, s.length);
+			offset += s.length;
+		}
+		return result;
+	}
+
+	private void storeCombined(@Nonnull WorldChunk k, ObjectArrayList<byte[]> sections) {
+		byte[] cb = buildCombined(sections);
+		if (cb != null) {
+			chunkCacheCombined.put(k, cb);
+		}
+	}
+
+	public void preCacheY0Data(Player player, int chunkX, int chunkZ) {
+		if (!isPlayerReady(player)) return;
+		World world = player.getWorld();
+		if (enabledWorlds == null || !enabledWorlds.contains(world.getName())) return;
+
+		WorldChunk k = new WorldChunk(world.getName(), chunkX, chunkZ);
+		if (chunkCache.getIfPresent(k) != null) return;
+
+		if (!world.isChunkLoaded(chunkX, chunkZ)) return;
+
+		Chunk chunk = world.getChunkAt(chunkX, chunkZ);
+		ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+
+		ExecutorService executor = chunkProcessor;
+		if (executor == null || executor.isShutdown()) return;
+
+		executor.submit(() -> {
+			try {
+				if (chunkCache.getIfPresent(k) != null) return;
+				Object2ObjectOpenHashMap<BlockData, int[]> cvt = threadChunkData.get();
+				cvt.clear();
+				ObjectArrayList<byte[]> pp = new ObjectArrayList<>(4);
+
+				for (int sy = -4; sy < 0; sy++) {
+					byte[] sectionData = createSectionPayload(snapshot, chunkX, chunkZ, sy, cvt);
+					if (sectionData != null) {
+						pp.add(sectionData);
+					}
+				}
+
+				chunkCache.put(k, pp);
+				storeCombined(k, pp);
+			} catch (Exception e) { debug("Exception while pre-caching chunk %s, %s for %s: %s".formatted(chunkX, chunkZ, player.getName(), e.getMessage())); }
+		});
+	}
+
+	public void cacheChunkWithCallback(Player player, int chunkX, int chunkZ, Consumer<byte[]> callback) {
+		if (!isPlayerReady(player)) {
+			callback.accept(null);
+			return;
+		}
+		World world = player.getWorld();
+		if (enabledWorlds == null || !enabledWorlds.contains(world.getName())) {
+			callback.accept(null);
+			return;
+		}
+
+		WorldChunk k = new WorldChunk(world.getName(), chunkX, chunkZ);
+
+		byte[] combined = chunkCacheCombined.getIfPresent(k);
+		if (combined != null) {
+			callback.accept(combined.length > 0 ? combined : null);
+			return;
+		}
+
+		ObjectArrayList<byte[]> existing = chunkCache.getIfPresent(k);
+		if (existing != null) {
+			byte[] cb = buildCombined(existing);
+			if (cb != null) chunkCacheCombined.put(k, cb);
+			callback.accept(cb);
+			return;
+		}
+
+		if (!world.isChunkLoaded(chunkX, chunkZ)) {
+			callback.accept(null);
+			return;
+		}
+
+		Chunk chunk = world.getChunkAt(chunkX, chunkZ);
+		ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+
+		ExecutorService executor = chunkProcessor;
+		if (executor == null || executor.isShutdown()) {
+			callback.accept(null);
+			return;
+		}
+
+		executor.submit(() -> {
+			try {
+				byte[] cached = chunkCacheCombined.getIfPresent(k);
+				if (cached != null) {
+					callback.accept(cached.length > 0 ? cached : null);
+					return;
+				}
+				Object2ObjectOpenHashMap<BlockData, int[]> cvt = threadChunkData.get();
+				cvt.clear();
+				ObjectArrayList<byte[]> pp = new ObjectArrayList<>(4);
+
+				for (int sy = -4; sy < 0; sy++) {
+					byte[] sectionData = createSectionPayload(snapshot, chunkX, chunkZ, sy, cvt);
+					if (sectionData != null) {
+						pp.add(sectionData);
+					}
+				}
+
+				chunkCache.put(k, pp);
+				byte[] cb = buildCombined(pp);
+				if (cb != null) chunkCacheCombined.put(k, cb);
+				callback.accept(cb);
+			} catch (Exception e) {
+				callback.accept(null);
+			}
+		});
+	}
+
+	public void handlePlayerQuit(PlayerQuitEvent event) {
+		if (chunkInjector != null) {
+			chunkInjector.eject(event.getPlayer());
+		}
+		readyPlayers.remove(event.getPlayer().getUniqueId());
+	}
+
+	public void handleChunkLoad(ChunkLoadEvent event) {
+		if (enabledWorlds == null || !enabledWorlds.contains(event.getWorld().getName())) return;
+		if (!hasReadyPlayersInWorld(event.getWorld())) return;
+
+		Chunk chunk = event.getChunk();
+		int chunkX = chunk.getX();
+		int chunkZ = chunk.getZ();
+
+		WorldChunk k = new WorldChunk(event.getWorld().getName(), chunkX, chunkZ);
+		if (chunkCache.getIfPresent(k) != null) return;
+
+		ChunkSnapshot snapshot = chunk.getChunkSnapshot(false, false, false);
+
+		ExecutorService executor = chunkProcessor;
+		if (executor == null || executor.isShutdown()) return;
+
+		executor.submit(() -> {
+			try {
+				if (chunkCache.getIfPresent(k) != null) return;
+				Object2ObjectOpenHashMap<BlockData, int[]> cvt = threadChunkData.get();
+				cvt.clear();
+				ObjectArrayList<byte[]> pp = new ObjectArrayList<>(4);
+
+				for (int sy = -4; sy < 0; sy++) {
+					byte[] sectionData = createSectionPayload(snapshot, chunkX, chunkZ, sy, cvt);
+					if (sectionData != null) {
+						pp.add(sectionData);
+					}
+				}
+
+				chunkCache.put(k, pp);
+				storeCombined(k, pp);
+			} catch (Exception e) { debug("Exception while handling chunk load: "+e.getMessage()); }
+		});
+	}
+
+	private byte[] createSectionPayload(ChunkSnapshot s, int x, int z, int sy, Object2ObjectOpenHashMap<BlockData, int[]> c) throws IOException {
+		// Ensure thread-local buffer is exactly 12,288 bytes to prevent overflow
+		byte[] bd = threadData.get();
+		Arrays.fill(bd, (byte) 0);
+		int idx = 0;
+		boolean hasContent = false;
+		int by = sy << 4;
+
+		// Optimized Loop Order: Matches standard Minecraft internal memory layouts
+		for (int xx = 0; xx < 16; xx++) {
+			for (int zz = 0; zz < 16; zz++) {
+				for (int y = 0; y < 16; y++) {
+					int wy = by + y;
+
+					BlockData blkData = s.getBlockData(xx, wy, zz);
+					int[] ld = c.get(blkData); // Fast map lookup
+
+					if (ld == null) { // Avoid getOrDefault overhead
+						ld = (viaIds != null) ? viaIds.toLegacy(blkData) : EMPTY_LEGACY;
+						c.put(blkData, ld);
+					}
+
+					// Bitwise packing
+					short lb = (short) ((ld[1] << 12) | (ld[0] & 0xFFF));
+					byte pl = (byte) ((s.getBlockSkyLight(xx, wy, zz) << 4) | s.getBlockEmittedLight(xx, wy, zz));
+
+					// Write sequence
+					int linear = ((y << 8) | (zz << 4) | xx) * 3;
+					bd[linear] = (byte) (lb >> 8);
+					bd[linear + 1] = (byte) lb;
+					bd[linear + 2] = pl;
+					if (linear + 3 > idx) idx = linear + 3;
+
+					if (lb != 0 || pl != 0) {
+						hasContent = true;
+					}
+				}
+			}
+		}
+
+		if (!hasContent) return null;
+
+		ByteArrayOutputStream bout = threadOut.get();
+		bout.reset();
+
+		// DataOutputStream wrapper safely writes schema
+		try (DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("chunk_data");
+			out.writeInt(x);
+			out.writeInt(z);
+			out.writeInt(sy);
+			out.write(bd, 0, idx);
+		}
+		return bout.toByteArray();
+	}
+
+	public void handleBlockBreak(BlockBreakEvent event) {
+		if (event.getBlock().getY() < 0) {
+			handleBlockChange(event.getBlock().getLocation(), event.getBlock().getBlockData(), Material.AIR.createBlockData());
+			invalidateChunkCache(event.getBlock().getWorld(), event.getBlock().getX(), event.getBlock().getZ());
+		}
+	}
+
+	public void handleBlockPlace(BlockPlaceEvent event) {
+		if (event.getBlock().getY() < 0) {
+			handleBlockChange(event.getBlock().getLocation(), event.getBlockReplacedState().getBlockData(), event.getBlock().getBlockData());
+			invalidateChunkCache(event.getBlock().getWorld(), event.getBlock().getX(), event.getBlock().getZ());
+		}
+	}
+
+	public void handleBlockPhysics(BlockPhysicsEvent event) {
+		final Block block = event.getBlock();
+		if (block.getY() < 0) {
+			final Location loc = block.getLocation();
+			final World world = loc.getWorld();
+			SchedulerCompat.runRegionLater(plugin, loc, () -> {
+				BlockData ud = world.getBlockData(loc);
+				sendSingleBlockUpdate(loc, ud);
+				invalidateChunkCache(world, loc.getBlockX(), loc.getBlockZ());
+			}, 1L);
+		}
+	}
+
+	public void handleBlockExplode(BlockExplodeEvent event) {
+		final List<Block> btu = new ArrayList<>(event.blockList());
+		for (Block block : btu) {
+			if (block.getY() >= 0) continue;
+			final Location loc = block.getLocation();
+			SchedulerCompat.runRegionLater(plugin, loc, () -> {
+				sendSingleBlockUpdate(loc, Material.AIR.createBlockData());
+				invalidateChunkCache(loc.getWorld(), loc.getBlockX(), loc.getBlockZ());
+			}, 1L);
+		}
+	}
+
+	public void handleBlockFromTo(BlockFromToEvent event) {
+		final Block block = event.getToBlock();
+		if (block.getY() < 0) {
+			SchedulerCompat.runRegionLater(plugin, block.getLocation(), () -> {
+				sendSingleBlockUpdate(block.getLocation(), block.getBlockData());
+				invalidateChunkCache(block.getWorld(), block.getX(), block.getZ());
+			}, 1L);
+		}
+	}
+
+	private void sendSingleBlockUpdate(Location loc, BlockData data) {
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
+			 DataOutputStream out = new DataOutputStream(bout)) {
+
+			out.writeUTF("block_update");
+			out.writeInt(loc.getBlockX());
+			out.writeInt(loc.getBlockY());
+			out.writeInt(loc.getBlockZ());
+
+			int[] ld = viaIds.toLegacy(data);
+			out.writeShort((short) ((ld[1] << 12) | (ld[0] & 0xFFF)));
+			byte[] py = bout.toByteArray();
+
+			sendToNearbyPlayers(loc, py);
+
+		} catch (IOException e) {
+			severe("Failed to create single block update payload: " + e.getMessage());
+		}
+	}
+
+	public static int getEmission(BlockData data) {
+		if (getLightEmissionMethod != null) {
+			try {
+				return (int) getLightEmissionMethod.invoke(data);
+			} catch (Exception e) {}
+		}
+		return legacy_light_map.getOrDefault(data.getMaterial(), 0);
+	}
+
+	private void handleBlockChange(Location loc, BlockData od, BlockData nd) {
+		sendSingleBlockUpdate(loc, nd);
+		boolean oe = getEmission(od) > 0;
+		boolean ne = getEmission(nd) > 0;
+		boolean oo = od.getMaterial().isOccluding();
+		boolean no = nd.getMaterial().isOccluding();
+		if (oe != ne || oo != no) {
+			sendLightUpdate(loc);
+		}
+	}
+
+	private void sendLightUpdate(Location loc) {
+		ObjectOpenHashSet<Coords> stu = new ObjectOpenHashSet<>();
+		World w = loc.getWorld();
+		int bx = loc.getBlockX();
+		int by = loc.getBlockY();
+		int bz = loc.getBlockZ();
+		for (int dx = -1; dx <= 1; dx++) {
+			for (int dy = -1; dy <= 1; dy++) {
+				for (int dz = -1; dz <= 1; dz++) {
+					int ny = by + dy;
+					if (ny < -64 || ny >= 0) continue;
+
+					stu.add(new Coords(
+						(bx + dx) >> 4,
+						ny >> 4,
+						(bz + dz) >> 4
+					));
+				}
+			}
+		}
+		for (Coords sc : stu) {
+			if (!w.isChunkLoaded(sc.x, sc.z)) continue;
+			ChunkSnapshot s = w.getChunkAt(sc.x, sc.z).getChunkSnapshot(true, false, false);
+
+			if (chunkProcessor != null && !chunkProcessor.isShutdown()) {
+				chunkProcessor.submit(() -> {
+					try {
+						byte[] py = createLightPayload(s, sc);
+						sendToNearbyPlayers(loc, py);
+					} catch (IOException e) {
+						severe("Failed to create lighting payload: " + e.getMessage());
+					}
+				});
+			}
+		}
+	}
+
+	private void sendToNearbyPlayers(Location loc, byte[] payload) {
+		if (payload == null || loc.getWorld() == null || readyPlayers.isEmpty()) return;
+
+		final World world = loc.getWorld();
+
+		SchedulerCompat.runGlobal(plugin, () -> {
+			for (Player player : Bukkit.getOnlinePlayers()) {
+				if (!player.isOnline() || !isPlayerReady(player)) continue;
+				if (!world.equals(player.getWorld())) continue;
+				if (player.getLocation().distanceSquared(loc) >= 4096) continue;
+				SchedulerCompat.runEntity(player, plugin, () -> {
+					if (!player.isOnline() || !isPlayerReady(player)) return;
+					if (!world.equals(player.getWorld())) return;
+					if (player.getLocation().distanceSquared(loc) >= 4096) return;
+					player.sendPluginMessage(plugin, CHANNEL, payload);
+				});
+			}
+		});
+	}
+
+	private byte[] createLightPayload(ChunkSnapshot s, Coords sc) throws IOException {
+		try (ByteArrayOutputStream bout = new ByteArrayOutputStream(4120);
+			 DataOutputStream out = new DataOutputStream(bout)) {
+			out.writeUTF("lighting_update");
+			out.writeInt(sc.x);
+			out.writeInt(sc.z);
+			out.writeInt(sc.y);
+
+			byte[] ld = new byte[4096];
+			int by = sc.y * 16;
+			int i = 0;
+
+			for (int y = 0; y < 16; y++) {
+				for (int z = 0; z < 16; z++) {
+					for (int x = 0; x < 16; x++) {
+						int wy = by + y;
+						int bl = s.getBlockEmittedLight(x, wy, z);
+						int sl = s.getBlockSkyLight(x, wy, z);
+						ld[i++] = (byte) ((sl << 4) | bl);
+					}
+				}
+			}
+			out.write(ld);
+			return bout.toByteArray();
+		}
+	}
+
+	private boolean hasReadyPlayersInWorld(World world) {
+		for (UUID playerId : readyPlayers) {
+			Player player = plugin.getServer().getPlayer(playerId);
+			if (player != null && player.isOnline() && world.equals(player.getWorld())) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+}

src/main/resources/config.yml

@@ -0,0 +1,94 @@
+#  \\//  //=\\
+#   ||  || - ||
+#   ||   \\=//
+
+y0:
+  y0-enabled: true
+
+  # Debug mode
+  debug-mode: false
+
+  # Worlds for y0 to be enabled in
+  enabled-worlds:
+    - 'world'
+
+  # The amount of threads for the chunk processor to use - using more threads processes chunks faster, but increases CPU usage
+  # -1 is automatic
+  chunk-processor-threads: 3
+
+  # The size of the cache
+  cache-size: 192
+  # How long until the cache expires (minutes)
+  cache-expiration: 2
+
+  # Kick outdated clients that (generally) not compatible with this version of TuffX
+  kick-outdated-clients: false
+
+
+#  ||\\ ||== //_\\ <>  //= ==== ||\\ \\//
+#  ||// ||== || __ ||  \\   ||  ||//  ||
+#  ||\\ ||== \\__/ || =//   ||  ||\\  ||
+
+registry:
+  # Set to true to list your server on the TuffClient discovery
+  enabled: false
+  # WebSocket URL for the server discovery
+  server-url: 'wss://api.tuffest.org/ws'
+  # IP for your Eaglercraft server
+  server: 'wss://urserverip.net'
+
+
+# \\    // <>   //\\   ||\\ ||    //=\\   //= ||//   //=
+#  \\  //  ||  //==\\  ||<< ||   ||   || ||   ||\\   \\
+#   \\//   || //    \\ ||// ||==  \\=//   \\= || \\ =//
+
+viablocks:
+  viablocks-enabled: false
+
+  # Set to true to send a welcome book to players with the ViaBlocks client when they join for the first time.
+  # This book can explain the feature and provide a link for bug reports.
+  send-welcome-book: false
+
+  # Set to true to enable detailed logging in the server console for debugging.
+  debug: false
+
+  # Sync mode controls how often chunk and block updates are sent to clients.
+  # normal: base speed for fast sync.
+  # reduced: much slower updates to minimize client lag.
+  sync-mode: normal
+
+
+# \\    // <>   //\\   ||== ||\ || ==== <> ==== <> ||==  //=
+#  \\  //  ||  //==\\  ||== ||\\||  ||  ||  ||  || ||==  \\
+#   \\//   || //    \\ ||== || \||  ||  ||  ||  || ||== =//
+
+viaentities:
+  viaentities-enabled: true
+
+  # Set to true to enable detailed logging in the server console for debugging.
+  debug: false
+
+  # Measured in blocks, leave as '-1' for the default view distance.
+  max-distance: -1
+
+
+#  ==== ||   || ||== ||==  //\\   //= ==== <>  //=\\  ||\ ||  //=
+#   ||  ||   || ||== ||== //==\\ ||    ||  || ||   || ||\\||  \\
+#   ||   \\=//  ||   ||  //    \\ \\=  ||  ||  \\=//  || \|| =//
+
+# 1.13+ swimming
+swimming:
+  enabled: true
+  debug: false
+
+# Allows players to see 1.13+ things in the creative menu
+creative-items:
+  enabled: true
+  debug: false
+
+restrictions:
+  enabled: true
+  debug: false
+  # What TuffClient modules are not allowed
+  disallow:
+    - clientbrand

src/main/resources/entity_mappings.json

@@ -0,0 +1,84 @@
+{
+  "modern_entities": {
+    "minecraft:allay": {"added": "1.19", "model": "allay", "animated": true},
+    "minecraft:armadillo": {"added": "1.20.5", "model": "armadillo", "animated": true},
+    "minecraft:axolotl": {"added": "1.17", "model": "axolotl", "animated": true},
+    "minecraft:bee": {"added": "1.15", "model": "bee", "animated": true},
+    "minecraft:bogged": {"added": "1.21", "model": "bogged", "animated": true},
+    "minecraft:breeze": {"added": "1.21", "model": "breeze", "animated": true},
+    "minecraft:breeze_wind_charge": {"added": "1.21", "model": "wind_charge", "animated": false},
+    "minecraft:camel": {"added": "1.20", "model": "camel", "animated": true},
+    "minecraft:cat": {"added": "1.14", "model": "cat", "animated": true},
+    "minecraft:cod": {"added": "1.13", "model": "cod", "animated": true},
+    "minecraft:copper_golem": {"added": "1.21", "model": "copper_golem", "animated": true},
+    "minecraft:creaking": {"added": "1.21", "model": "creaking", "animated": true},
+    "minecraft:dolphin": {"added": "1.13", "model": "dolphin", "animated": true},
+    "minecraft:drowned": {"added": "1.13", "model": "drowned", "animated": true},
+    "minecraft:fox": {"added": "1.14", "model": "fox", "animated": true},
+    "minecraft:frog": {"added": "1.19", "model": "frog", "animated": true},
+    "minecraft:glow_squid": {"added": "1.17", "model": "glow_squid", "animated": true},
+    "minecraft:goat": {"added": "1.17", "model": "goat", "animated": true},
+    "minecraft:happy_ghast": {"added": "1.21", "model": "happy_ghast", "animated": true},
+    "minecraft:hoglin": {"added": "1.16", "model": "hoglin", "animated": true},
+    "minecraft:panda": {"added": "1.14", "model": "panda", "animated": true},
+    "minecraft:phantom": {"added": "1.13", "model": "phantom", "animated": true},
+    "minecraft:piglin": {"added": "1.16", "model": "piglin", "animated": true},
+    "minecraft:piglin_brute": {"added": "1.16.2", "model": "piglin_brute", "animated": true},
+    "minecraft:pillager": {"added": "1.14", "model": "pillager", "animated": true},
+    "minecraft:pufferfish": {"added": "1.13", "model": "pufferfish", "animated": true},
+    "minecraft:ravager": {"added": "1.14", "model": "ravager", "animated": true},
+    "minecraft:salmon": {"added": "1.13", "model": "salmon", "animated": true},
+    "minecraft:sniffer": {"added": "1.20", "model": "sniffer", "animated": true},
+    "minecraft:strider": {"added": "1.16", "model": "strider", "animated": true},
+    "minecraft:tadpole": {"added": "1.19", "model": "tadpole", "animated": true},
+    "minecraft:trader_llama": {"added": "1.14", "model": "trader_llama", "animated": true},
+    "minecraft:trident": {"added": "1.13", "model": "trident", "animated": false},
+    "minecraft:tropical_fish": {"added": "1.13", "model": "tropical_fish", "animated": true},
+    "minecraft:turtle": {"added": "1.13", "model": "turtle", "animated": true},
+    "minecraft:vex": {"added": "1.11", "model": "vex", "animated": true},
+    "minecraft:wandering_trader": {"added": "1.14", "model": "wandering_trader", "animated": true},
+    "minecraft:warden": {"added": "1.19", "model": "warden", "animated": true},
+    "minecraft:wind_charge": {"added": "1.21", "model": "wind_charge", "animated": false},
+    "minecraft:zoglin": {"added": "1.16", "model": "zoglin", "animated": true},
+    "minecraft:glow_item_frame": {"added": "1.17", "model": "item_frame", "animated": false},
+    "minecraft:marker": {"added": "1.17", "model": null, "animated": false},
+    "minecraft:ominous_item_spawner": {"added": "1.21", "model": null, "animated": false}
+  },
+  "entity_size": {
+    "minecraft:allay": {"width": 0.35, "height": 0.6},
+    "minecraft:armadillo": {"width": 0.7, "height": 0.65},
+    "minecraft:axolotl": {"width": 0.75, "height": 0.42},
+    "minecraft:bee": {"width": 0.7, "height": 0.6},
+    "minecraft:bogged": {"width": 0.6, "height": 1.99},
+    "minecraft:breeze": {"width": 0.6, "height": 1.77},
+    "minecraft:camel": {"width": 1.7, "height": 2.375},
+    "minecraft:cat": {"width": 0.6, "height": 0.7},
+    "minecraft:cod": {"width": 0.5, "height": 0.3},
+    "minecraft:creaking": {"width": 0.9, "height": 2.7},
+    "minecraft:dolphin": {"width": 0.9, "height": 0.6},
+    "minecraft:drowned": {"width": 0.6, "height": 1.95},
+    "minecraft:fox": {"width": 0.6, "height": 0.7},
+    "minecraft:frog": {"width": 0.5, "height": 0.5},
+    "minecraft:glow_squid": {"width": 0.8, "height": 0.8},
+    "minecraft:goat": {"width": 0.9, "height": 1.3},
+    "minecraft:happy_ghast": {"width": 4.0, "height": 4.0},
+    "minecraft:hoglin": {"width": 1.4, "height": 1.4},
+    "minecraft:panda": {"width": 1.3, "height": 1.25},
+    "minecraft:phantom": {"width": 0.9, "height": 0.5},
+    "minecraft:piglin": {"width": 0.6, "height": 1.95},
+    "minecraft:piglin_brute": {"width": 0.6, "height": 1.95},
+    "minecraft:pillager": {"width": 0.6, "height": 1.95},
+    "minecraft:pufferfish": {"width": 0.7, "height": 0.7},
+    "minecraft:ravager": {"width": 1.95, "height": 2.2},
+    "minecraft:salmon": {"width": 0.7, "height": 0.4},
+    "minecraft:sniffer": {"width": 1.9, "height": 1.75},
+    "minecraft:strider": {"width": 0.9, "height": 1.7},
+    "minecraft:tadpole": {"width": 0.4, "height": 0.3},
+    "minecraft:trident": {"width": 0.5, "height": 0.5},
+    "minecraft:tropical_fish": {"width": 0.5, "height": 0.4},
+    "minecraft:turtle": {"width": 1.2, "height": 0.4},
+    "minecraft:vex": {"width": 0.4, "height": 0.8},
+    "minecraft:warden": {"width": 0.9, "height": 2.9},
+    "minecraft:zoglin": {"width": 1.4, "height": 1.4}
+  }
+}

src/main/resources/mapping-1.10.json

@@ -0,0 +1,467 @@
+{
+  "sounds": [
+    "ambient.cave",
+    "block.anvil.break",
+    "block.anvil.destroy",
+    "block.anvil.fall",
+    "block.anvil.hit",
+    "block.anvil.land",
+    "block.anvil.place",
+    "block.anvil.step",
+    "block.anvil.use",
+    "block.brewing_stand.brew",
+    "block.chest.close",
+    "block.chest.locked",
+    "block.chest.open",
+    "block.chorus_flower.death",
+    "block.chorus_flower.grow",
+    "block.cloth.break",
+    "block.cloth.fall",
+    "block.cloth.hit",
+    "block.cloth.place",
+    "block.cloth.step",
+    "block.comparator.click",
+    "block.dispenser.dispense",
+    "block.dispenser.fail",
+    "block.dispenser.launch",
+    "block.enchantment_table.use",
+    "block.end_gateway.spawn",
+    "block.enderchest.close",
+    "block.enderchest.open",
+    "block.fence_gate.close",
+    "block.fence_gate.open",
+    "block.fire.ambient",
+    "block.fire.extinguish",
+    "block.furnace.fire_crackle",
+    "block.glass.break",
+    "block.glass.fall",
+    "block.glass.hit",
+    "block.glass.place",
+    "block.glass.step",
+    "block.grass.break",
+    "block.grass.fall",
+    "block.grass.hit",
+    "block.grass.place",
+    "block.grass.step",
+    "block.gravel.break",
+    "block.gravel.fall",
+    "block.gravel.hit",
+    "block.gravel.place",
+    "block.gravel.step",
+    "block.iron_door.close",
+    "block.iron_door.open",
+    "block.iron_trapdoor.close",
+    "block.iron_trapdoor.open",
+    "block.ladder.break",
+    "block.ladder.fall",
+    "block.ladder.hit",
+    "block.ladder.place",
+    "block.ladder.step",
+    "block.lava.ambient",
+    "block.lava.extinguish",
+    "block.lava.pop",
+    "block.lever.click",
+    "block.metal.break",
+    "block.metal.fall",
+    "block.metal.hit",
+    "block.metal.place",
+    "block.metal.step",
+    "block.metal_pressureplate.click_off",
+    "block.metal_pressureplate.click_on",
+    "block.note.basedrum",
+    "block.note.bass",
+    "block.note.harp",
+    "block.note.hat",
+    "block.note.pling",
+    "block.note.snare",
+    "block.piston.contract",
+    "block.piston.extend",
+    "block.portal.ambient",
+    "block.portal.travel",
+    "block.portal.trigger",
+    "block.redstone_torch.burnout",
+    "block.sand.break",
+    "block.sand.fall",
+    "block.sand.hit",
+    "block.sand.place",
+    "block.sand.step",
+    "block.slime.break",
+    "block.slime.fall",
+    "block.slime.hit",
+    "block.slime.place",
+    "block.slime.step",
+    "block.snow.break",
+    "block.snow.fall",
+    "block.snow.hit",
+    "block.snow.place",
+    "block.snow.step",
+    "block.stone.break",
+    "block.stone.fall",
+    "block.stone.hit",
+    "block.stone.place",
+    "block.stone.step",
+    "block.stone_button.click_off",
+    "block.stone_button.click_on",
+    "block.stone_pressureplate.click_off",
+    "block.stone_pressureplate.click_on",
+    "block.tripwire.attach",
+    "block.tripwire.click_off",
+    "block.tripwire.click_on",
+    "block.tripwire.detach",
+    "block.water.ambient",
+    "block.waterlily.place",
+    "block.wood.break",
+    "block.wood.fall",
+    "block.wood.hit",
+    "block.wood.place",
+    "block.wood.step",
+    "block.wood_button.click_off",
+    "block.wood_button.click_on",
+    "block.wood_pressureplate.click_off",
+    "block.wood_pressureplate.click_on",
+    "block.wooden_door.close",
+    "block.wooden_door.open",
+    "block.wooden_trapdoor.close",
+    "block.wooden_trapdoor.open",
+    "enchant.thorns.hit",
+    "entity.armorstand.break",
+    "entity.armorstand.fall",
+    "entity.armorstand.hit",
+    "entity.armorstand.place",
+    "entity.arrow.hit",
+    "entity.arrow.hit_player",
+    "entity.arrow.shoot",
+    "entity.bat.ambient",
+    "entity.bat.death",
+    "entity.bat.hurt",
+    "entity.bat.loop",
+    "entity.bat.takeoff",
+    "entity.blaze.ambient",
+    "entity.blaze.burn",
+    "entity.blaze.death",
+    "entity.blaze.hurt",
+    "entity.blaze.shoot",
+    "entity.bobber.splash",
+    "entity.bobber.throw",
+    "entity.cat.ambient",
+    "entity.cat.death",
+    "entity.cat.hiss",
+    "entity.cat.hurt",
+    "entity.cat.purr",
+    "entity.cat.purreow",
+    "entity.chicken.ambient",
+    "entity.chicken.death",
+    "entity.chicken.egg",
+    "entity.chicken.hurt",
+    "entity.chicken.step",
+    "entity.cow.ambient",
+    "entity.cow.death",
+    "entity.cow.hurt",
+    "entity.cow.milk",
+    "entity.cow.step",
+    "entity.creeper.death",
+    "entity.creeper.hurt",
+    "entity.creeper.primed",
+    "entity.donkey.ambient",
+    "entity.donkey.angry",
+    "entity.donkey.chest",
+    "entity.donkey.death",
+    "entity.donkey.hurt",
+    "entity.egg.throw",
+    "entity.elder_guardian.ambient",
+    "entity.elder_guardian.ambient_land",
+    "entity.elder_guardian.curse",
+    "entity.elder_guardian.death",
+    "entity.elder_guardian.death_land",
+    "entity.elder_guardian.hurt",
+    "entity.elder_guardian.hurt_land",
+    "entity.enderdragon.ambient",
+    "entity.enderdragon.death",
+    "entity.enderdragon.flap",
+    "entity.enderdragon.growl",
+    "entity.enderdragon.hurt",
+    "entity.enderdragon.shoot",
+    "entity.enderdragon_fireball.explode",
+    "entity.endereye.launch",
+    "entity.endermen.ambient",
+    "entity.endermen.death",
+    "entity.endermen.hurt",
+    "entity.endermen.scream",
+    "entity.endermen.stare",
+    "entity.endermen.teleport",
+    "entity.endermite.ambient",
+    "entity.endermite.death",
+    "entity.endermite.hurt",
+    "entity.endermite.step",
+    "entity.enderpearl.throw",
+    "entity.experience_bottle.throw",
+    "entity.experience_orb.pickup",
+    "entity.experience_orb.touch",
+    "entity.firework.blast",
+    "entity.firework.blast_far",
+    "entity.firework.large_blast",
+    "entity.firework.large_blast_far",
+    "entity.firework.launch",
+    "entity.firework.shoot",
+    "entity.firework.twinkle",
+    "entity.firework.twinkle_far",
+    "entity.generic.big_fall",
+    "entity.generic.burn",
+    "entity.generic.death",
+    "entity.generic.drink",
+    "entity.generic.eat",
+    "entity.generic.explode",
+    "entity.generic.extinguish_fire",
+    "entity.generic.hurt",
+    "entity.generic.small_fall",
+    "entity.generic.splash",
+    "entity.generic.swim",
+    "entity.ghast.ambient",
+    "entity.ghast.death",
+    "entity.ghast.hurt",
+    "entity.ghast.scream",
+    "entity.ghast.shoot",
+    "entity.ghast.warn",
+    "entity.guardian.ambient",
+    "entity.guardian.ambient_land",
+    "entity.guardian.attack",
+    "entity.guardian.death",
+    "entity.guardian.death_land",
+    "entity.guardian.flop",
+    "entity.guardian.hurt",
+    "entity.guardian.hurt_land",
+    "entity.horse.ambient",
+    "entity.horse.angry",
+    "entity.horse.armor",
+    "entity.horse.breathe",
+    "entity.horse.death",
+    "entity.horse.eat",
+    "entity.horse.gallop",
+    "entity.horse.hurt",
+    "entity.horse.jump",
+    "entity.horse.land",
+    "entity.horse.saddle",
+    "entity.horse.step",
+    "entity.horse.step_wood",
+    "entity.hostile.big_fall",
+    "entity.hostile.death",
+    "entity.hostile.hurt",
+    "entity.hostile.small_fall",
+    "entity.hostile.splash",
+    "entity.hostile.swim",
+    "entity.husk.ambient",
+    "entity.husk.death",
+    "entity.husk.hurt",
+    "entity.husk.step",
+    "entity.irongolem.attack",
+    "entity.irongolem.death",
+    "entity.irongolem.hurt",
+    "entity.irongolem.step",
+    "entity.item.break",
+    "entity.item.pickup",
+    "entity.itemframe.add_item",
+    "entity.itemframe.break",
+    "entity.itemframe.place",
+    "entity.itemframe.remove_item",
+    "entity.itemframe.rotate_item",
+    "entity.leashknot.break",
+    "entity.leashknot.place",
+    "entity.lightning.impact",
+    "entity.lightning.thunder",
+    "entity.lingeringpotion.throw",
+    "entity.magmacube.death",
+    "entity.magmacube.hurt",
+    "entity.magmacube.jump",
+    "entity.magmacube.squish",
+    "entity.minecart.inside",
+    "entity.minecart.riding",
+    "entity.mooshroom.shear",
+    "entity.mule.ambient",
+    "entity.mule.death",
+    "entity.mule.hurt",
+    "entity.painting.break",
+    "entity.painting.place",
+    "entity.pig.ambient",
+    "entity.pig.death",
+    "entity.pig.hurt",
+    "entity.pig.saddle",
+    "entity.pig.step",
+    "entity.player.attack.crit",
+    "entity.player.attack.knockback",
+    "entity.player.attack.nodamage",
+    "entity.player.attack.strong",
+    "entity.player.attack.sweep",
+    "entity.player.attack.weak",
+    "entity.player.big_fall",
+    "entity.player.breath",
+    "entity.player.burp",
+    "entity.player.death",
+    "entity.player.hurt",
+    "entity.player.levelup",
+    "entity.player.small_fall",
+    "entity.player.splash",
+    "entity.player.swim",
+    "entity.polar_bear.ambient",
+    "entity.polar_bear.baby_ambient",
+    "entity.polar_bear.death",
+    "entity.polar_bear.hurt",
+    "entity.polar_bear.step",
+    "entity.polar_bear.warning",
+    "entity.rabbit.ambient",
+    "entity.rabbit.attack",
+    "entity.rabbit.death",
+    "entity.rabbit.hurt",
+    "entity.rabbit.jump",
+    "entity.sheep.ambient",
+    "entity.sheep.death",
+    "entity.sheep.hurt",
+    "entity.sheep.shear",
+    "entity.sheep.step",
+    "entity.shulker.ambient",
+    "entity.shulker.close",
+    "entity.shulker.death",
+    "entity.shulker.hurt",
+    "entity.shulker.hurt_closed",
+    "entity.shulker.open",
+    "entity.shulker.shoot",
+    "entity.shulker.teleport",
+    "entity.shulker_bullet.hit",
+    "entity.shulker_bullet.hurt",
+    "entity.silverfish.ambient",
+    "entity.silverfish.death",
+    "entity.silverfish.hurt",
+    "entity.silverfish.step",
+    "entity.skeleton.ambient",
+    "entity.skeleton.death",
+    "entity.skeleton.hurt",
+    "entity.skeleton.shoot",
+    "entity.skeleton.step",
+    "entity.skeleton_horse.ambient",
+    "entity.skeleton_horse.death",
+    "entity.skeleton_horse.hurt",
+    "entity.slime.attack",
+    "entity.slime.death",
+    "entity.slime.hurt",
+    "entity.slime.jump",
+    "entity.slime.squish",
+    "entity.small_magmacube.death",
+    "entity.small_magmacube.hurt",
+    "entity.small_magmacube.squish",
+    "entity.small_slime.death",
+    "entity.small_slime.hurt",
+    "entity.small_slime.jump",
+    "entity.small_slime.squish",
+    "entity.snowball.throw",
+    "entity.snowman.ambient",
+    "entity.snowman.death",
+    "entity.snowman.hurt",
+    "entity.snowman.shoot",
+    "entity.spider.ambient",
+    "entity.spider.death",
+    "entity.spider.hurt",
+    "entity.spider.step",
+    "entity.splash_potion.break",
+    "entity.splash_potion.throw",
+    "entity.squid.ambient",
+    "entity.squid.death",
+    "entity.squid.hurt",
+    "entity.stray.ambient",
+    "entity.stray.death",
+    "entity.stray.hurt",
+    "entity.stray.step",
+    "entity.tnt.primed",
+    "entity.villager.ambient",
+    "entity.villager.death",
+    "entity.villager.hurt",
+    "entity.villager.no",
+    "entity.villager.trading",
+    "entity.villager.yes",
+    "entity.witch.ambient",
+    "entity.witch.death",
+    "entity.witch.drink",
+    "entity.witch.hurt",
+    "entity.witch.throw",
+    "entity.wither.ambient",
+    "entity.wither.break_block",
+    "entity.wither.death",
+    "entity.wither.hurt",
+    "entity.wither.shoot",
+    "entity.wither.spawn",
+    "entity.wither_skeleton.ambient",
+    "entity.wither_skeleton.death",
+    "entity.wither_skeleton.hurt",
+    "entity.wither_skeleton.step",
+    "entity.wolf.ambient",
+    "entity.wolf.death",
+    "entity.wolf.growl",
+    "entity.wolf.howl",
+    "entity.wolf.hurt",
+    "entity.wolf.pant",
+    "entity.wolf.shake",
+    "entity.wolf.step",
+    "entity.wolf.whine",
+    "entity.zombie.ambient",
+    "entity.zombie.attack_door_wood",
+    "entity.zombie.attack_iron_door",
+    "entity.zombie.break_door_wood",
+    "entity.zombie.death",
+    "entity.zombie.hurt",
+    "entity.zombie.infect",
+    "entity.zombie.step",
+    "entity.zombie_horse.ambient",
+    "entity.zombie_horse.death",
+    "entity.zombie_horse.hurt",
+    "entity.zombie_pig.ambient",
+    "entity.zombie_pig.angry",
+    "entity.zombie_pig.death",
+    "entity.zombie_pig.hurt",
+    "entity.zombie_villager.ambient",
+    "entity.zombie_villager.converted",
+    "entity.zombie_villager.cure",
+    "entity.zombie_villager.death",
+    "entity.zombie_villager.hurt",
+    "entity.zombie_villager.step",
+    "item.armor.equip_chain",
+    "item.armor.equip_diamond",
+    "item.armor.equip_generic",
+    "item.armor.equip_gold",
+    "item.armor.equip_iron",
+    "item.armor.equip_leather",
+    "item.bottle.fill",
+    "item.bottle.fill_dragonbreath",
+    "item.bucket.empty",
+    "item.bucket.empty_lava",
+    "item.bucket.fill",
+    "item.bucket.fill_lava",
+    "item.chorus_fruit.teleport",
+    "item.elytra.flying",
+    "item.firecharge.use",
+    "item.flintandsteel.use",
+    "item.hoe.till",
+    "item.shield.block",
+    "item.shield.break",
+    "item.shovel.flatten",
+    "music.creative",
+    "music.credits",
+    "music.dragon",
+    "music.end",
+    "music.game",
+    "music.menu",
+    "music.nether",
+    "record.11",
+    "record.13",
+    "record.blocks",
+    "record.cat",
+    "record.chirp",
+    "record.far",
+    "record.mall",
+    "record.mellohi",
+    "record.stal",
+    "record.strad",
+    "record.wait",
+    "record.ward",
+    "ui.button.click",
+    "weather.rain",
+    "weather.rain.above"
+  ]
+}

src/main/resources/mapping-1.11.json

@@ -0,0 +1,497 @@
+{
+  "sounds": [
+    "ambient.cave",
+    "block.anvil.break",
+    "block.anvil.destroy",
+    "block.anvil.fall",
+    "block.anvil.hit",
+    "block.anvil.land",
+    "block.anvil.place",
+    "block.anvil.step",
+    "block.anvil.use",
+    "block.brewing_stand.brew",
+    "block.chest.close",
+    "block.chest.locked",
+    "block.chest.open",
+    "block.chorus_flower.death",
+    "block.chorus_flower.grow",
+    "block.cloth.break",
+    "block.cloth.fall",
+    "block.cloth.hit",
+    "block.cloth.place",
+    "block.cloth.step",
+    "block.comparator.click",
+    "block.dispenser.dispense",
+    "block.dispenser.fail",
+    "block.dispenser.launch",
+    "block.enchantment_table.use",
+    "block.end_gateway.spawn",
+    "block.enderchest.close",
+    "block.enderchest.open",
+    "block.fence_gate.close",
+    "block.fence_gate.open",
+    "block.fire.ambient",
+    "block.fire.extinguish",
+    "block.furnace.fire_crackle",
+    "block.glass.break",
+    "block.glass.fall",
+    "block.glass.hit",
+    "block.glass.place",
+    "block.glass.step",
+    "block.grass.break",
+    "block.grass.fall",
+    "block.grass.hit",
+    "block.grass.place",
+    "block.grass.step",
+    "block.gravel.break",
+    "block.gravel.fall",
+    "block.gravel.hit",
+    "block.gravel.place",
+    "block.gravel.step",
+    "block.iron_door.close",
+    "block.iron_door.open",
+    "block.iron_trapdoor.close",
+    "block.iron_trapdoor.open",
+    "block.ladder.break",
+    "block.ladder.fall",
+    "block.ladder.hit",
+    "block.ladder.place",
+    "block.ladder.step",
+    "block.lava.ambient",
+    "block.lava.extinguish",
+    "block.lava.pop",
+    "block.lever.click",
+    "block.metal.break",
+    "block.metal.fall",
+    "block.metal.hit",
+    "block.metal.place",
+    "block.metal.step",
+    "block.metal_pressureplate.click_off",
+    "block.metal_pressureplate.click_on",
+    "block.note.basedrum",
+    "block.note.bass",
+    "block.note.harp",
+    "block.note.hat",
+    "block.note.pling",
+    "block.note.snare",
+    "block.piston.contract",
+    "block.piston.extend",
+    "block.portal.ambient",
+    "block.portal.travel",
+    "block.portal.trigger",
+    "block.redstone_torch.burnout",
+    "block.sand.break",
+    "block.sand.fall",
+    "block.sand.hit",
+    "block.sand.place",
+    "block.sand.step",
+    "block.shulker_box.close",
+    "block.shulker_box.open",
+    "block.slime.break",
+    "block.slime.fall",
+    "block.slime.hit",
+    "block.slime.place",
+    "block.slime.step",
+    "block.snow.break",
+    "block.snow.fall",
+    "block.snow.hit",
+    "block.snow.place",
+    "block.snow.step",
+    "block.stone.break",
+    "block.stone.fall",
+    "block.stone.hit",
+    "block.stone.place",
+    "block.stone.step",
+    "block.stone_button.click_off",
+    "block.stone_button.click_on",
+    "block.stone_pressureplate.click_off",
+    "block.stone_pressureplate.click_on",
+    "block.tripwire.attach",
+    "block.tripwire.click_off",
+    "block.tripwire.click_on",
+    "block.tripwire.detach",
+    "block.water.ambient",
+    "block.waterlily.place",
+    "block.wood.break",
+    "block.wood.fall",
+    "block.wood.hit",
+    "block.wood.place",
+    "block.wood.step",
+    "block.wood_button.click_off",
+    "block.wood_button.click_on",
+    "block.wood_pressureplate.click_off",
+    "block.wood_pressureplate.click_on",
+    "block.wooden_door.close",
+    "block.wooden_door.open",
+    "block.wooden_trapdoor.close",
+    "block.wooden_trapdoor.open",
+    "enchant.thorns.hit",
+    "entity.armorstand.break",
+    "entity.armorstand.fall",
+    "entity.armorstand.hit",
+    "entity.armorstand.place",
+    "entity.arrow.hit",
+    "entity.arrow.hit_player",
+    "entity.arrow.shoot",
+    "entity.bat.ambient",
+    "entity.bat.death",
+    "entity.bat.hurt",
+    "entity.bat.loop",
+    "entity.bat.takeoff",
+    "entity.blaze.ambient",
+    "entity.blaze.burn",
+    "entity.blaze.death",
+    "entity.blaze.hurt",
+    "entity.blaze.shoot",
+    "entity.bobber.splash",
+    "entity.bobber.throw",
+    "entity.cat.ambient",
+    "entity.cat.death",
+    "entity.cat.hiss",
+    "entity.cat.hurt",
+    "entity.cat.purr",
+    "entity.cat.purreow",
+    "entity.chicken.ambient",
+    "entity.chicken.death",
+    "entity.chicken.egg",
+    "entity.chicken.hurt",
+    "entity.chicken.step",
+    "entity.cow.ambient",
+    "entity.cow.death",
+    "entity.cow.hurt",
+    "entity.cow.milk",
+    "entity.cow.step",
+    "entity.creeper.death",
+    "entity.creeper.hurt",
+    "entity.creeper.primed",
+    "entity.donkey.ambient",
+    "entity.donkey.angry",
+    "entity.donkey.chest",
+    "entity.donkey.death",
+    "entity.donkey.hurt",
+    "entity.egg.throw",
+    "entity.elder_guardian.ambient",
+    "entity.elder_guardian.ambient_land",
+    "entity.elder_guardian.curse",
+    "entity.elder_guardian.death",
+    "entity.elder_guardian.death_land",
+    "entity.elder_guardian.hurt",
+    "entity.elder_guardian.flop",
+    "entity.elder_guardian.hurt_land",
+    "entity.enderdragon.ambient",
+    "entity.enderdragon.death",
+    "entity.enderdragon.flap",
+    "entity.enderdragon.growl",
+    "entity.enderdragon.hurt",
+    "entity.enderdragon.shoot",
+    "entity.enderdragon_fireball.explode",
+    "entity.endereye.launch",
+    "entity.endermen.ambient",
+    "entity.endermen.death",
+    "entity.endermen.hurt",
+    "entity.endermen.scream",
+    "entity.endermen.stare",
+    "entity.endermen.teleport",
+    "entity.endermite.ambient",
+    "entity.endermite.death",
+    "entity.endermite.hurt",
+    "entity.endermite.step",
+    "entity.enderpearl.throw",
+    "entity.evocation_fangs.attack",
+    "entity.evocation_illager.ambient",
+    "entity.evocation_illager.cast_spell",
+    "entity.evocation_illager.death",
+    "entity.evocation_illager.hurt",
+    "entity.evocation_illager.prepare_attack",
+    "entity.evocation_illager.prepare_summon",
+    "entity.evocation_illager.prepare_wololo",
+    "entity.experience_bottle.throw",
+    "entity.experience_orb.pickup",
+    "entity.firework.blast",
+    "entity.firework.blast_far",
+    "entity.firework.large_blast",
+    "entity.firework.large_blast_far",
+    "entity.firework.launch",
+    "entity.firework.shoot",
+    "entity.firework.twinkle",
+    "entity.firework.twinkle_far",
+    "entity.generic.big_fall",
+    "entity.generic.burn",
+    "entity.generic.death",
+    "entity.generic.drink",
+    "entity.generic.eat",
+    "entity.generic.explode",
+    "entity.generic.extinguish_fire",
+    "entity.generic.hurt",
+    "entity.generic.small_fall",
+    "entity.generic.splash",
+    "entity.generic.swim",
+    "entity.ghast.ambient",
+    "entity.ghast.death",
+    "entity.ghast.hurt",
+    "entity.ghast.scream",
+    "entity.ghast.shoot",
+    "entity.ghast.warn",
+    "entity.guardian.ambient",
+    "entity.guardian.ambient_land",
+    "entity.guardian.attack",
+    "entity.guardian.death",
+    "entity.guardian.death_land",
+    "entity.guardian.flop",
+    "entity.guardian.hurt",
+    "entity.guardian.hurt_land",
+    "entity.horse.ambient",
+    "entity.horse.angry",
+    "entity.horse.armor",
+    "entity.horse.breathe",
+    "entity.horse.death",
+    "entity.horse.eat",
+    "entity.horse.gallop",
+    "entity.horse.hurt",
+    "entity.horse.jump",
+    "entity.horse.land",
+    "entity.horse.saddle",
+    "entity.horse.step",
+    "entity.horse.step_wood",
+    "entity.hostile.big_fall",
+    "entity.hostile.death",
+    "entity.hostile.hurt",
+    "entity.hostile.small_fall",
+    "entity.hostile.splash",
+    "entity.hostile.swim",
+    "entity.husk.ambient",
+    "entity.husk.death",
+    "entity.husk.hurt",
+    "entity.husk.step",
+    "entity.irongolem.attack",
+    "entity.irongolem.death",
+    "entity.irongolem.hurt",
+    "entity.irongolem.step",
+    "entity.item.break",
+    "entity.item.pickup",
+    "entity.itemframe.add_item",
+    "entity.itemframe.break",
+    "entity.itemframe.place",
+    "entity.itemframe.remove_item",
+    "entity.itemframe.rotate_item",
+    "entity.leashknot.break",
+    "entity.leashknot.place",
+    "entity.lightning.impact",
+    "entity.lightning.thunder",
+    "entity.lingeringpotion.throw",
+    "entity.llama.ambient",
+    "entity.llama.angry",
+    "entity.llama.chest",
+    "entity.llama.death",
+    "entity.llama.eat",
+    "entity.llama.hurt",
+    "entity.llama.spit",
+    "entity.llama.step",
+    "entity.llama.swag",
+    "entity.magmacube.death",
+    "entity.magmacube.hurt",
+    "entity.magmacube.jump",
+    "entity.magmacube.squish",
+    "entity.minecart.inside",
+    "entity.minecart.riding",
+    "entity.mooshroom.shear",
+    "entity.mule.ambient",
+    "entity.mule.chest",
+    "entity.mule.death",
+    "entity.mule.hurt",
+    "entity.painting.break",
+    "entity.painting.place",
+    "entity.pig.ambient",
+    "entity.pig.death",
+    "entity.pig.hurt",
+    "entity.pig.saddle",
+    "entity.pig.step",
+    "entity.player.attack.crit",
+    "entity.player.attack.knockback",
+    "entity.player.attack.nodamage",
+    "entity.player.attack.strong",
+    "entity.player.attack.sweep",
+    "entity.player.attack.weak",
+    "entity.player.big_fall",
+    "entity.player.breath",
+    "entity.player.burp",
+    "entity.player.death",
+    "entity.player.hurt",
+    "entity.player.levelup",
+    "entity.player.small_fall",
+    "entity.player.splash",
+    "entity.player.swim",
+    "entity.polar_bear.ambient",
+    "entity.polar_bear.baby_ambient",
+    "entity.polar_bear.death",
+    "entity.polar_bear.hurt",
+    "entity.polar_bear.step",
+    "entity.polar_bear.warning",
+    "entity.rabbit.ambient",
+    "entity.rabbit.attack",
+    "entity.rabbit.death",
+    "entity.rabbit.hurt",
+    "entity.rabbit.jump",
+    "entity.sheep.ambient",
+    "entity.sheep.death",
+    "entity.sheep.hurt",
+    "entity.sheep.shear",
+    "entity.sheep.step",
+    "entity.shulker.ambient",
+    "entity.shulker.close",
+    "entity.shulker.death",
+    "entity.shulker.hurt",
+    "entity.shulker.hurt_closed",
+    "entity.shulker.open",
+    "entity.shulker.shoot",
+    "entity.shulker.teleport",
+    "entity.shulker_bullet.hit",
+    "entity.shulker_bullet.hurt",
+    "entity.silverfish.ambient",
+    "entity.silverfish.death",
+    "entity.silverfish.hurt",
+    "entity.silverfish.step",
+    "entity.skeleton.ambient",
+    "entity.skeleton.death",
+    "entity.skeleton.hurt",
+    "entity.skeleton.shoot",
+    "entity.skeleton.step",
+    "entity.skeleton_horse.ambient",
+    "entity.skeleton_horse.death",
+    "entity.skeleton_horse.hurt",
+    "entity.slime.attack",
+    "entity.slime.death",
+    "entity.slime.hurt",
+    "entity.slime.jump",
+    "entity.slime.squish",
+    "entity.small_magmacube.death",
+    "entity.small_magmacube.hurt",
+    "entity.small_magmacube.squish",
+    "entity.small_slime.death",
+    "entity.small_slime.hurt",
+    "entity.small_slime.jump",
+    "entity.small_slime.squish",
+    "entity.snowball.throw",
+    "entity.snowman.ambient",
+    "entity.snowman.death",
+    "entity.snowman.hurt",
+    "entity.snowman.shoot",
+    "entity.spider.ambient",
+    "entity.spider.death",
+    "entity.spider.hurt",
+    "entity.spider.step",
+    "entity.splash_potion.break",
+    "entity.splash_potion.throw",
+    "entity.squid.ambient",
+    "entity.squid.death",
+    "entity.squid.hurt",
+    "entity.stray.ambient",
+    "entity.stray.death",
+    "entity.stray.hurt",
+    "entity.stray.step",
+    "entity.tnt.primed",
+    "entity.vex.ambient",
+    "entity.vex.charge",
+    "entity.vex.death",
+    "entity.vex.hurt",
+    "entity.villager.ambient",
+    "entity.villager.death",
+    "entity.villager.hurt",
+    "entity.villager.no",
+    "entity.villager.trading",
+    "entity.villager.yes",
+    "entity.vindication_illager.ambient",
+    "entity.vindication_illager.death",
+    "entity.vindication_illager.hurt",
+    "entity.witch.ambient",
+    "entity.witch.death",
+    "entity.witch.drink",
+    "entity.witch.hurt",
+    "entity.witch.throw",
+    "entity.wither.ambient",
+    "entity.wither.break_block",
+    "entity.wither.death",
+    "entity.wither.hurt",
+    "entity.wither.shoot",
+    "entity.wither.spawn",
+    "entity.wither_skeleton.ambient",
+    "entity.wither_skeleton.death",
+    "entity.wither_skeleton.hurt",
+    "entity.wither_skeleton.step",
+    "entity.wolf.ambient",
+    "entity.wolf.death",
+    "entity.wolf.growl",
+    "entity.wolf.howl",
+    "entity.wolf.hurt",
+    "entity.wolf.pant",
+    "entity.wolf.shake",
+    "entity.wolf.step",
+    "entity.wolf.whine",
+    "entity.zombie.ambient",
+    "entity.zombie.attack_door_wood",
+    "entity.zombie.attack_iron_door",
+    "entity.zombie.break_door_wood",
+    "entity.zombie.death",
+    "entity.zombie.hurt",
+    "entity.zombie.infect",
+    "entity.zombie.step",
+    "entity.zombie_horse.ambient",
+    "entity.zombie_horse.death",
+    "entity.zombie_horse.hurt",
+    "entity.zombie_pig.ambient",
+    "entity.zombie_pig.angry",
+    "entity.zombie_pig.death",
+    "entity.zombie_pig.hurt",
+    "entity.zombie_villager.ambient",
+    "entity.zombie_villager.converted",
+    "entity.zombie_villager.cure",
+    "entity.zombie_villager.death",
+    "entity.zombie_villager.hurt",
+    "entity.zombie_villager.step",
+    "item.armor.equip_chain",
+    "item.armor.equip_diamond",
+    "item.armor.equip_elytra",
+    "item.armor.equip_generic",
+    "item.armor.equip_gold",
+    "item.armor.equip_iron",
+    "item.armor.equip_leather",
+    "item.bottle.empty",
+    "item.bottle.fill",
+    "item.bottle.fill_dragonbreath",
+    "item.bucket.empty",
+    "item.bucket.empty_lava",
+    "item.bucket.fill",
+    "item.bucket.fill_lava",
+    "item.chorus_fruit.teleport",
+    "item.elytra.flying",
+    "item.firecharge.use",
+    "item.flintandsteel.use",
+    "item.hoe.till",
+    "item.shield.block",
+    "item.shield.break",
+    "item.shovel.flatten",
+    "item.totem.use",
+    "music.creative",
+    "music.credits",
+    "music.dragon",
+    "music.end",
+    "music.game",
+    "music.menu",
+    "music.nether",
+    "record.11",
+    "record.13",
+    "record.blocks",
+    "record.cat",
+    "record.chirp",
+    "record.far",
+    "record.mall",
+    "record.mellohi",
+    "record.stal",
+    "record.strad",
+    "record.wait",
+    "record.ward",
+    "ui.button.click",
+    "weather.rain",
+    "weather.rain.above"
+  ]
+}

src/main/resources/mapping-1.7.10.json

@@ -0,0 +1,2 @@
+{
+}

src/main/resources/mapping-1.8.json

@@ -0,0 +1,250 @@
+{
+  "sounds": [
+    "ambient.cave.cave",
+    "ambient.weather.rain",
+    "ambient.weather.thunder",
+    "game.player.hurt.fall.big",
+    "game.player.hurt.fall.small",
+    "game.neutral.hurt.fall.big",
+    "game.neutral.hurt.fall.small",
+    "game.hostile.hurt.fall.big",
+    "game.hostile.hurt.fall.small",
+    "game.player.hurt",
+    "game.neutral.hurt",
+    "game.hostile.hurt",
+    "game.player.die",
+    "game.neutral.die",
+    "game.hostile.die",
+    "dig.cloth",
+    "dig.grass",
+    "dig.gravel",
+    "dig.sand",
+    "dig.snow",
+    "dig.stone",
+    "dig.wood",
+    "fire.fire",
+    "fire.ignite",
+    "item.fireCharge.use",
+    "fireworks.blast",
+    "fireworks.blast_far",
+    "fireworks.largeBlast",
+    "fireworks.largeBlast_far",
+    "fireworks.launch",
+    "fireworks.twinkle",
+    "fireworks.twinkle_far",
+    "liquid.lava",
+    "liquid.lavapop",
+    "game.neutral.swim.splash",
+    "game.player.swim.splash",
+    "game.hostile.swim.splash",
+    "game.player.swim",
+    "game.neutral.swim",
+    "game.hostile.swim",
+    "liquid.water",
+    "minecart.base",
+    "minecart.inside",
+    "mob.bat.death",
+    "mob.bat.hurt",
+    "mob.bat.idle",
+    "mob.bat.loop",
+    "mob.bat.takeoff",
+    "mob.blaze.breathe",
+    "mob.blaze.death",
+    "mob.blaze.hit",
+    "mob.guardian.hit",
+    "mob.guardian.idle",
+    "mob.guardian.death",
+    "mob.guardian.elder.hit",
+    "mob.guardian.elder.idle",
+    "mob.guardian.elder.death",
+    "mob.guardian.land.hit",
+    "mob.guardian.land.idle",
+    "mob.guardian.land.death",
+    "mob.guardian.curse",
+    "mob.guardian.attack",
+    "mob.guardian.flop",
+    "mob.cat.hiss",
+    "mob.cat.hitt",
+    "mob.cat.meow",
+    "mob.cat.purr",
+    "mob.cat.purreow",
+    "mob.chicken.hurt",
+    "mob.chicken.plop",
+    "mob.chicken.say",
+    "mob.chicken.step",
+    "mob.cow.hurt",
+    "mob.cow.say",
+    "mob.cow.step",
+    "mob.creeper.death",
+    "mob.creeper.say",
+    "mob.enderdragon.end",
+    "mob.enderdragon.growl",
+    "mob.enderdragon.hit",
+    "mob.enderdragon.wings",
+    "mob.endermen.death",
+    "mob.endermen.hit",
+    "mob.endermen.idle",
+    "mob.endermen.portal",
+    "mob.endermen.scream",
+    "mob.endermen.stare",
+    "mob.ghast.affectionate_scream",
+    "mob.ghast.charge",
+    "mob.ghast.death",
+    "mob.ghast.fireball",
+    "mob.ghast.moan",
+    "mob.ghast.scream",
+    "mob.horse.angry",
+    "mob.horse.armor",
+    "mob.horse.breathe",
+    "mob.horse.death",
+    "mob.horse.donkey.angry",
+    "mob.horse.donkey.death",
+    "mob.horse.donkey.hit",
+    "mob.horse.donkey.idle",
+    "mob.horse.gallop",
+    "mob.horse.hit",
+    "mob.horse.idle",
+    "mob.horse.jump",
+    "mob.horse.land",
+    "mob.horse.leather",
+    "mob.horse.skeleton.death",
+    "mob.horse.skeleton.hit",
+    "mob.horse.skeleton.idle",
+    "mob.horse.soft",
+    "mob.horse.wood",
+    "mob.horse.zombie.death",
+    "mob.horse.zombie.hit",
+    "mob.horse.zombie.idle",
+    "mob.irongolem.death",
+    "mob.irongolem.hit",
+    "mob.irongolem.throw",
+    "mob.irongolem.walk",
+    "mob.magmacube.big",
+    "mob.magmacube.jump",
+    "mob.magmacube.small",
+    "mob.pig.death",
+    "mob.pig.say",
+    "mob.pig.step",
+    "mob.rabbit.hurt",
+    "mob.rabbit.idle",
+    "mob.rabbit.hop",
+    "mob.rabbit.death",
+    "mob.sheep.say",
+    "mob.sheep.shear",
+    "mob.sheep.step",
+    "mob.silverfish.hit",
+    "mob.silverfish.kill",
+    "mob.silverfish.say",
+    "mob.silverfish.step",
+    "mob.skeleton.death",
+    "mob.skeleton.hurt",
+    "mob.skeleton.say",
+    "mob.skeleton.step",
+    "mob.slime.attack",
+    "mob.slime.big",
+    "mob.slime.small",
+    "mob.spider.death",
+    "mob.spider.say",
+    "mob.spider.step",
+    "mob.villager.death",
+    "mob.villager.haggle",
+    "mob.villager.hit",
+    "mob.villager.idle",
+    "mob.villager.no",
+    "mob.villager.yes",
+    "mob.wither.death",
+    "mob.wither.hurt",
+    "mob.wither.idle",
+    "mob.wither.shoot",
+    "mob.wither.spawn",
+    "mob.wolf.bark",
+    "mob.wolf.death",
+    "mob.wolf.growl",
+    "mob.wolf.howl",
+    "mob.wolf.hurt",
+    "mob.wolf.panting",
+    "mob.wolf.shake",
+    "mob.wolf.step",
+    "mob.wolf.whine",
+    "mob.zombie.death",
+    "mob.zombie.hurt",
+    "mob.zombie.infect",
+    "mob.zombie.metal",
+    "mob.zombie.remedy",
+    "mob.zombie.say",
+    "mob.zombie.step",
+    "mob.zombie.unfect",
+    "mob.zombie.wood",
+    "mob.zombie.woodbreak",
+    "mob.zombiepig.zpig",
+    "mob.zombiepig.zpigangry",
+    "mob.zombiepig.zpigdeath",
+    "mob.zombiepig.zpighurt",
+    "note.bass",
+    "note.bassattack",
+    "note.bd",
+    "note.harp",
+    "note.hat",
+    "note.pling",
+    "note.snare",
+    "portal.portal",
+    "portal.travel",
+    "portal.trigger",
+    "random.anvil_break",
+    "random.anvil_land",
+    "random.anvil_use",
+    "random.bow",
+    "random.bowhit",
+    "random.break",
+    "random.burp",
+    "random.chestclosed",
+    "random.chestopen",
+    "gui.button.press",
+    "random.click",
+    "random.door_close",
+    "random.door_open",
+    "random.drink",
+    "random.eat",
+    "random.explode",
+    "random.fizz",
+    "game.tnt.primed",
+    "creeper.primed",
+    "dig.glass",
+    "game.potion.smash",
+    "random.levelup",
+    "random.orb",
+    "random.pop",
+    "random.splash",
+    "random.successful_hit",
+    "random.wood_click",
+    "records.11",
+    "records.13",
+    "records.blocks",
+    "records.cat",
+    "records.chirp",
+    "records.far",
+    "records.mall",
+    "records.mellohi",
+    "records.stal",
+    "records.strad",
+    "records.wait",
+    "records.ward",
+    "step.cloth",
+    "step.grass",
+    "step.gravel",
+    "step.ladder",
+    "step.sand",
+    "step.snow",
+    "step.stone",
+    "step.wood",
+    "tile.piston.in",
+    "tile.piston.out",
+    "music.menu",
+    "music.game",
+    "music.game.creative",
+    "music.game.end",
+    "music.game.end.dragon",
+    "music.game.end.credits",
+    "music.game.nether"
+  ]
+}

src/main/resources/mapping-1.9.4.json

@@ -0,0 +1,448 @@
+{
+  "sounds": [
+    "ambient.cave",
+    "block.anvil.break",
+    "block.anvil.destroy",
+    "block.anvil.fall",
+    "block.anvil.hit",
+    "block.anvil.land",
+    "block.anvil.place",
+    "block.anvil.step",
+    "block.anvil.use",
+    "block.brewing_stand.brew",
+    "block.chest.close",
+    "block.chest.locked",
+    "block.chest.open",
+    "block.chorus_flower.death",
+    "block.chorus_flower.grow",
+    "block.cloth.break",
+    "block.cloth.fall",
+    "block.cloth.hit",
+    "block.cloth.place",
+    "block.cloth.step",
+    "block.comparator.click",
+    "block.dispenser.dispense",
+    "block.dispenser.fail",
+    "block.dispenser.launch",
+    "block.end_gateway.spawn",
+    "block.enderchest.close",
+    "block.enderchest.open",
+    "block.fence_gate.close",
+    "block.fence_gate.open",
+    "block.fire.ambient",
+    "block.fire.extinguish",
+    "block.furnace.fire_crackle",
+    "block.glass.break",
+    "block.glass.fall",
+    "block.glass.hit",
+    "block.glass.place",
+    "block.glass.step",
+    "block.grass.break",
+    "block.grass.fall",
+    "block.grass.hit",
+    "block.grass.place",
+    "block.grass.step",
+    "block.gravel.break",
+    "block.gravel.fall",
+    "block.gravel.hit",
+    "block.gravel.place",
+    "block.gravel.step",
+    "block.iron_door.close",
+    "block.iron_door.open",
+    "block.iron_trapdoor.close",
+    "block.iron_trapdoor.open",
+    "block.ladder.break",
+    "block.ladder.fall",
+    "block.ladder.hit",
+    "block.ladder.place",
+    "block.ladder.step",
+    "block.lava.ambient",
+    "block.lava.extinguish",
+    "block.lava.pop",
+    "block.lever.click",
+    "block.metal.break",
+    "block.metal.fall",
+    "block.metal.hit",
+    "block.metal.place",
+    "block.metal.step",
+    "block.metal_pressureplate.click_off",
+    "block.metal_pressureplate.click_on",
+    "block.note.basedrum",
+    "block.note.bass",
+    "block.note.harp",
+    "block.note.hat",
+    "block.note.pling",
+    "block.note.snare",
+    "block.piston.contract",
+    "block.piston.extend",
+    "block.portal.ambient",
+    "block.portal.travel",
+    "block.portal.trigger",
+    "block.redstone_torch.burnout",
+    "block.sand.break",
+    "block.sand.fall",
+    "block.sand.hit",
+    "block.sand.place",
+    "block.sand.step",
+    "block.slime.break",
+    "block.slime.fall",
+    "block.slime.hit",
+    "block.slime.place",
+    "block.slime.step",
+    "block.snow.break",
+    "block.snow.fall",
+    "block.snow.hit",
+    "block.snow.place",
+    "block.snow.step",
+    "block.stone.break",
+    "block.stone.fall",
+    "block.stone.hit",
+    "block.stone.place",
+    "block.stone.step",
+    "block.stone_button.click_off",
+    "block.stone_button.click_on",
+    "block.stone_pressureplate.click_off",
+    "block.stone_pressureplate.click_on",
+    "block.tripwire.attach",
+    "block.tripwire.click_off",
+    "block.tripwire.click_on",
+    "block.tripwire.detach",
+    "block.water.ambient",
+    "block.waterlily.place",
+    "block.wood.break",
+    "block.wood.fall",
+    "block.wood.hit",
+    "block.wood.place",
+    "block.wood.step",
+    "block.wood_button.click_off",
+    "block.wood_button.click_on",
+    "block.wood_pressureplate.click_off",
+    "block.wood_pressureplate.click_on",
+    "block.wooden_door.close",
+    "block.wooden_door.open",
+    "block.wooden_trapdoor.close",
+    "block.wooden_trapdoor.open",
+    "enchant.thorns.hit",
+    "entity.armorstand.break",
+    "entity.armorstand.fall",
+    "entity.armorstand.hit",
+    "entity.armorstand.place",
+    "entity.arrow.hit",
+    "entity.arrow.hit_player",
+    "entity.arrow.shoot",
+    "entity.bat.ambient",
+    "entity.bat.death",
+    "entity.bat.hurt",
+    "entity.bat.loop",
+    "entity.bat.takeoff",
+    "entity.blaze.ambient",
+    "entity.blaze.burn",
+    "entity.blaze.death",
+    "entity.blaze.hurt",
+    "entity.blaze.shoot",
+    "entity.bobber.splash",
+    "entity.bobber.throw",
+    "entity.cat.ambient",
+    "entity.cat.death",
+    "entity.cat.hiss",
+    "entity.cat.hurt",
+    "entity.cat.purr",
+    "entity.cat.purreow",
+    "entity.chicken.ambient",
+    "entity.chicken.death",
+    "entity.chicken.egg",
+    "entity.chicken.hurt",
+    "entity.chicken.step",
+    "entity.cow.ambient",
+    "entity.cow.death",
+    "entity.cow.hurt",
+    "entity.cow.milk",
+    "entity.cow.step",
+    "entity.creeper.death",
+    "entity.creeper.hurt",
+    "entity.creeper.primed",
+    "entity.donkey.ambient",
+    "entity.donkey.angry",
+    "entity.donkey.chest",
+    "entity.donkey.death",
+    "entity.donkey.hurt",
+    "entity.egg.throw",
+    "entity.elder_guardian.ambient",
+    "entity.elder_guardian.ambient_land",
+    "entity.elder_guardian.curse",
+    "entity.elder_guardian.death",
+    "entity.elder_guardian.death_land",
+    "entity.elder_guardian.hurt",
+    "entity.elder_guardian.hurt_land",
+    "entity.enderdragon.ambient",
+    "entity.enderdragon.death",
+    "entity.enderdragon.flap",
+    "entity.enderdragon.growl",
+    "entity.enderdragon.hurt",
+    "entity.enderdragon.shoot",
+    "entity.enderdragon_fireball.explode",
+    "entity.endereye.launch",
+    "entity.endermen.ambient",
+    "entity.endermen.death",
+    "entity.endermen.hurt",
+    "entity.endermen.scream",
+    "entity.endermen.stare",
+    "entity.endermen.teleport",
+    "entity.endermite.ambient",
+    "entity.endermite.death",
+    "entity.endermite.hurt",
+    "entity.endermite.step",
+    "entity.enderpearl.throw",
+    "entity.experience_bottle.throw",
+    "entity.experience_orb.pickup",
+    "entity.experience_orb.touch",
+    "entity.firework.blast",
+    "entity.firework.blast_far",
+    "entity.firework.large_blast",
+    "entity.firework.large_blast_far",
+    "entity.firework.launch",
+    "entity.firework.shoot",
+    "entity.firework.twinkle",
+    "entity.firework.twinkle_far",
+    "entity.generic.big_fall",
+    "entity.generic.burn",
+    "entity.generic.death",
+    "entity.generic.drink",
+    "entity.generic.eat",
+    "entity.generic.explode",
+    "entity.generic.extinguish_fire",
+    "entity.generic.hurt",
+    "entity.generic.small_fall",
+    "entity.generic.splash",
+    "entity.generic.swim",
+    "entity.ghast.ambient",
+    "entity.ghast.death",
+    "entity.ghast.hurt",
+    "entity.ghast.scream",
+    "entity.ghast.shoot",
+    "entity.ghast.warn",
+    "entity.guardian.ambient",
+    "entity.guardian.ambient_land",
+    "entity.guardian.attack",
+    "entity.guardian.death",
+    "entity.guardian.death_land",
+    "entity.guardian.flop",
+    "entity.guardian.hurt",
+    "entity.guardian.hurt_land",
+    "entity.horse.ambient",
+    "entity.horse.angry",
+    "entity.horse.armor",
+    "entity.horse.breathe",
+    "entity.horse.death",
+    "entity.horse.eat",
+    "entity.horse.gallop",
+    "entity.horse.hurt",
+    "entity.horse.jump",
+    "entity.horse.land",
+    "entity.horse.saddle",
+    "entity.horse.step",
+    "entity.horse.step_wood",
+    "entity.hostile.big_fall",
+    "entity.hostile.death",
+    "entity.hostile.hurt",
+    "entity.hostile.small_fall",
+    "entity.hostile.splash",
+    "entity.hostile.swim",
+    "entity.irongolem.attack",
+    "entity.irongolem.death",
+    "entity.irongolem.hurt",
+    "entity.irongolem.step",
+    "entity.item.break",
+    "entity.item.pickup",
+    "entity.itemframe.add_item",
+    "entity.itemframe.break",
+    "entity.itemframe.place",
+    "entity.itemframe.remove_item",
+    "entity.itemframe.rotate_item",
+    "entity.leashknot.break",
+    "entity.leashknot.place",
+    "entity.lightning.impact",
+    "entity.lightning.thunder",
+    "entity.lingeringpotion.throw",
+    "entity.magmacube.death",
+    "entity.magmacube.hurt",
+    "entity.magmacube.jump",
+    "entity.magmacube.squish",
+    "entity.minecart.inside",
+    "entity.minecart.riding",
+    "entity.mooshroom.shear",
+    "entity.mule.ambient",
+    "entity.mule.death",
+    "entity.mule.hurt",
+    "entity.painting.break",
+    "entity.painting.place",
+    "entity.pig.ambient",
+    "entity.pig.death",
+    "entity.pig.hurt",
+    "entity.pig.saddle",
+    "entity.pig.step",
+    "entity.player.attack.crit",
+    "entity.player.attack.knockback",
+    "entity.player.attack.nodamage",
+    "entity.player.attack.strong",
+    "entity.player.attack.sweep",
+    "entity.player.attack.weak",
+    "entity.player.big_fall",
+    "entity.player.breath",
+    "entity.player.burp",
+    "entity.player.death",
+    "entity.player.hurt",
+    "entity.player.levelup",
+    "entity.player.small_fall",
+    "entity.player.splash",
+    "entity.player.swim",
+    "entity.rabbit.ambient",
+    "entity.rabbit.attack",
+    "entity.rabbit.death",
+    "entity.rabbit.hurt",
+    "entity.rabbit.jump",
+    "entity.sheep.ambient",
+    "entity.sheep.death",
+    "entity.sheep.hurt",
+    "entity.sheep.shear",
+    "entity.sheep.step",
+    "entity.shulker.ambient",
+    "entity.shulker.close",
+    "entity.shulker.death",
+    "entity.shulker.hurt",
+    "entity.shulker.hurt_closed",
+    "entity.shulker.open",
+    "entity.shulker.shoot",
+    "entity.shulker.teleport",
+    "entity.shulker_bullet.hit",
+    "entity.shulker_bullet.hurt",
+    "entity.silverfish.ambient",
+    "entity.silverfish.death",
+    "entity.silverfish.hurt",
+    "entity.silverfish.step",
+    "entity.skeleton.ambient",
+    "entity.skeleton.death",
+    "entity.skeleton.hurt",
+    "entity.skeleton.shoot",
+    "entity.skeleton.step",
+    "entity.skeleton_horse.ambient",
+    "entity.skeleton_horse.death",
+    "entity.skeleton_horse.hurt",
+    "entity.slime.attack",
+    "entity.slime.death",
+    "entity.slime.hurt",
+    "entity.slime.jump",
+    "entity.slime.squish",
+    "entity.small_magmacube.death",
+    "entity.small_magmacube.hurt",
+    "entity.small_magmacube.squish",
+    "entity.small_slime.death",
+    "entity.small_slime.hurt",
+    "entity.small_slime.jump",
+    "entity.small_slime.squish",
+    "entity.snowball.throw",
+    "entity.snowman.ambient",
+    "entity.snowman.death",
+    "entity.snowman.hurt",
+    "entity.snowman.shoot",
+    "entity.spider.ambient",
+    "entity.spider.death",
+    "entity.spider.hurt",
+    "entity.spider.step",
+    "entity.splash_potion.break",
+    "entity.splash_potion.throw",
+    "entity.squid.ambient",
+    "entity.squid.death",
+    "entity.squid.hurt",
+    "entity.tnt.primed",
+    "entity.villager.ambient",
+    "entity.villager.death",
+    "entity.villager.hurt",
+    "entity.villager.no",
+    "entity.villager.trading",
+    "entity.villager.yes",
+    "entity.witch.ambient",
+    "entity.witch.death",
+    "entity.witch.drink",
+    "entity.witch.hurt",
+    "entity.witch.throw",
+    "entity.wither.ambient",
+    "entity.wither.break_block",
+    "entity.wither.death",
+    "entity.wither.hurt",
+    "entity.wither.shoot",
+    "entity.wither.spawn",
+    "entity.wolf.ambient",
+    "entity.wolf.death",
+    "entity.wolf.growl",
+    "entity.wolf.howl",
+    "entity.wolf.hurt",
+    "entity.wolf.pant",
+    "entity.wolf.shake",
+    "entity.wolf.step",
+    "entity.wolf.whine",
+    "entity.zombie.ambient",
+    "entity.zombie.attack_door_wood",
+    "entity.zombie.attack_iron_door",
+    "entity.zombie.break_door_wood",
+    "entity.zombie.death",
+    "entity.zombie.hurt",
+    "entity.zombie.infect",
+    "entity.zombie.step",
+    "entity.zombie_horse.ambient",
+    "entity.zombie_horse.death",
+    "entity.zombie_horse.hurt",
+    "entity.zombie_pig.ambient",
+    "entity.zombie_pig.angry",
+    "entity.zombie_pig.death",
+    "entity.zombie_pig.hurt",
+    "entity.zombie_villager.ambient",
+    "entity.zombie_villager.converted",
+    "entity.zombie_villager.cure",
+    "entity.zombie_villager.death",
+    "entity.zombie_villager.hurt",
+    "entity.zombie_villager.step",
+    "item.armor.equip_chain",
+    "item.armor.equip_diamond",
+    "item.armor.equip_generic",
+    "item.armor.equip_gold",
+    "item.armor.equip_iron",
+    "item.armor.equip_leather",
+    "item.bottle.fill",
+    "item.bottle.fill_dragonbreath",
+    "item.bucket.empty",
+    "item.bucket.empty_lava",
+    "item.bucket.fill",
+    "item.bucket.fill_lava",
+    "item.chorus_fruit.teleport",
+    "item.elytra.flying",
+    "item.firecharge.use",
+    "item.flintandsteel.use",
+    "item.hoe.till",
+    "item.shield.block",
+    "item.shield.break",
+    "item.shovel.flatten",
+    "music.creative",
+    "music.credits",
+    "music.dragon",
+    "music.end",
+    "music.game",
+    "music.menu",
+    "music.nether",
+    "record.11",
+    "record.13",
+    "record.blocks",
+    "record.cat",
+    "record.chirp",
+    "record.far",
+    "record.mall",
+    "record.mellohi",
+    "record.stal",
+    "record.strad",
+    "record.wait",
+    "record.ward",
+    "ui.button.click",
+    "weather.rain",
+    "weather.rain.above"
+  ]
+}

src/main/resources/plugin.yml

@@ -0,0 +1,48 @@
+name: ${name}
+version: ${version}
+main: tf.tuff.TuffX
+author: Potato
+authors: [Potato, SyntaxSavy, llucasandersen, coleis1op, UplandJacob, MrNorshare]
+api-version: 1.18
+depend: [ViaVersion, ViaBackwards]
+
+commands:
+    viablocks:
+        description: Main command for ViaBlocks.
+        usage: /viablocks <get|refresh>
+        permission: tuffx.viablocks.command
+    tuffx:
+        description: Main command for TuffX.
+        usage: /tuffx <reload>
+    restrictions:
+        description: Allow or disallow TuffClient modules.
+        usage: /restrictions <allow|disallow> <module>
+    tuffxclearcache:
+        description: Clears TuffXPlus Y0 cache
+        usage: /tuffxclearcache
+        permission: tuffx.admin
+
+permissions:
+    tuffx.reload:
+        description: Allows use of the /tuffx reload subcommand.
+        default: op
+    tuffx.viablocks.command:
+        description: Allows use of the /viablocks command.
+        default: op
+    tuffx.viablocks.command.get:
+        description: Allows use of the /viablocks get subcommand.
+        default: op
+    tuffx.viablocks.command.refresh:
+        description: Allows use of the /viablocks refresh subcommand.
+        default: op
+    tuffx.restrictions.command:
+        description: Allows use of the /restrictions command.
+        default: op
+    tuffx.restrictions.command.allow:
+        description: Allows use of the /restrictions allow subcommand.
+        default: op
+    tuffx.restrictions.command.disallow:
+        description: Allows use of the /restrictions disallow subcommand.
+        default: op
+    tuffx.admin:
+        default: op

src/test/java/tf/tuff/TuffXTest.java

@@ -0,0 +1,45 @@
+package tf.tuff;
+
+import be.seeseemelk.mockbukkit.MockBukkit;
+import be.seeseemelk.mockbukkit.ServerMock;
+import org.junit.jupiter.api.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class TuffXTest {
+
+	private static ServerMock server;
+	private static TuffX plugin;
+
+	@BeforeEach
+	void setUp() {
+		server = MockBukkit.mock();
+		plugin = MockBukkit.load(TuffX.class);
+	}
+
+	@AfterEach
+	void tearDown() {
+		MockBukkit.unmock();
+	}
+
+	@Test
+	void pluginEnablesSuccessfully() {
+		assertTrue(plugin.isEnabled(), "Plugin should be enabled after load");
+	}
+
+
+	@Test
+	void reloadDoesNotThrow() {
+		assertDoesNotThrow(() -> plugin.reloadTuffX(),
+			"reloadTuffX() should not throw");
+	}
+
+
+	@Test
+	void findsMappingFile() {
+		assertTrue(plugin.y0Plugin.viaIds.findMappingFile("26.1.1").version().equals("1.21.11"), "Mapping file for 26.1.1 should be 1.21.11"); // check jump from 26.x to 1.21.x
+		assertTrue(plugin.y0Plugin.viaIds.findMappingFile("1.21.11").version().equals("1.21.11"), "Mapping file for 1.21.11 should be 1.21.11"); // check direct match
+		assertTrue(plugin.y0Plugin.viaIds.findMappingFile("1.21.10").version().equals("1.21.9"), "Mapping file for 1.21.10 should be 1.21.9"); // check fallback to one patch version lower
+		assertTrue(plugin.y0Plugin.viaIds.findMappingFile("1.21.1").version().equals("1.21"), "Mapping file for 1.21.1 should be 1.21"); // check one that won't have a patch version
+	}
+}

src/test/java/tf/tuff/netty/ChunkHandlerTest.java

@@ -0,0 +1,48 @@
+package tf.tuff.netty;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class ChunkHandlerTest {
+
+	@Test
+	void decodesSingleBlockChangePositionWithNegativeCoordinates() {
+		long packed = packBlockPosition(-21, -64, 37);
+
+		ChunkHandler.BlockChangePosition position = ChunkHandler.decodeSingleBlockChangePosition(packed);
+
+		assertEquals(-21, position.x());
+		assertEquals(-64, position.y());
+		assertEquals(37, position.z());
+	}
+
+	@Test
+	void decodesSectionBlockChangePositionBelowYZero() {
+		long sectionPosition = packSectionPosition(12, -5, -9);
+		long entry = packSectionEntry(3, 11, 7, 8123);
+
+		ChunkHandler.BlockChangePosition position = ChunkHandler.decodeMultiBlockChangePosition(sectionPosition, entry);
+
+		assertEquals((12 << 4) + 3, position.x());
+		assertEquals((-5 << 4) + 7, position.y());
+		assertEquals((-9 << 4) + 11, position.z());
+	}
+
+	private static long packBlockPosition(int x, int y, int z) {
+		return ((long) x & 0x3FFFFFFL) << 38
+			| ((long) z & 0x3FFFFFFL) << 12
+			| ((long) y & 0xFFFL);
+	}
+
+	private static long packSectionPosition(int x, int y, int z) {
+		return ((long) x & 0x3FFFFFL) << 42
+			| ((long) z & 0x3FFFFFL) << 20
+			| ((long) y & 0xFFFFFL);
+	}
+
+	private static long packSectionEntry(int localX, int localZ, int localY, int blockStateId) {
+		int localPosition = ((localX & 0xF) << 8) | ((localZ & 0xF) << 4) | (localY & 0xF);
+		return ((long) blockStateId << 12) | (localPosition & 0xFFFL);
+	}
+}