diff --git a/connector/pom.xml b/connector/pom.xml
index 4c8391766..ae81ffab5 100644
--- a/connector/pom.xml
+++ b/connector/pom.xml
@@ -130,7 +130,7 @@
         <dependency>
             <groupId>com.github.GeyserMC</groupId>
             <artifactId>MCProtocolLib</artifactId>
-            <version>6e318f5</version>
+            <version>e427237</version>
             <scope>compile</scope>
             <exclusions>
                 <exclusion>
diff --git a/connector/src/main/java/org/geysermc/connector/network/session/UpstreamSession.java b/connector/src/main/java/org/geysermc/connector/network/session/UpstreamSession.java
index edefd2f23..11df3139c 100644
--- a/connector/src/main/java/org/geysermc/connector/network/session/UpstreamSession.java
+++ b/connector/src/main/java/org/geysermc/connector/network/session/UpstreamSession.java
@@ -41,7 +41,6 @@ public class UpstreamSession {
     private boolean initialized = false;
 
     public void sendPacket(@NonNull BedrockPacket packet) {
-        System.out.println(packet);
         if (!isClosed()) {
             session.sendPacket(packet);
         }
diff --git a/connector/src/main/java/org/geysermc/connector/network/session/cache/ChunkCache.java b/connector/src/main/java/org/geysermc/connector/network/session/cache/ChunkCache.java
index 72d271a79..f5bc250c8 100644
--- a/connector/src/main/java/org/geysermc/connector/network/session/cache/ChunkCache.java
+++ b/connector/src/main/java/org/geysermc/connector/network/session/cache/ChunkCache.java
@@ -74,19 +74,19 @@ public class ChunkCache {
             return;
         }
 
-        if (y < minY || (y >> 4) > column.getChunks().length - 1) {
+        if (y < minY || ((y - minY) >> 4) > column.getChunks().length - 1) {
             // Y likely goes above or below the height limit of this world
             return;
         }
 
-        Chunk chunk = column.getChunks()[(y >> 4) - getChunkMinY()];
+        Chunk chunk = column.getChunks()[(y - minY) >> 4];
         if (chunk == null) {
             if (block != BlockStateValues.JAVA_AIR_ID) {
                 // A previously empty chunk, which is no longer empty as a block has been added to it
                 chunk = new Chunk();
                 // Fixes the chunk assuming that all blocks is the `block` variable we are updating. /shrug
                 chunk.getPalette().stateToId(BlockStateValues.JAVA_AIR_ID);
-                column.getChunks()[(y >> 4) - getChunkMinY()] = chunk;
+                column.getChunks()[(y - minY) >> 4] = chunk;
             } else {
                 // Nothing to update
                 return;
@@ -106,12 +106,12 @@ public class ChunkCache {
             return BlockStateValues.JAVA_AIR_ID;
         }
 
-        if (y < minY || (y >> 4) > column.getChunks().length - 1) {
+        if (y < minY || ((y - minY) >> 4) > column.getChunks().length - 1) {
             // Y likely goes above or below the height limit of this world
             return BlockStateValues.JAVA_AIR_ID;
         }
 
-        Chunk chunk = column.getChunks()[(y >> 4) - getChunkMinY()];
+        Chunk chunk = column.getChunks()[(y - minY) >> 4];
         if (chunk != null) {
             return chunk.get(x & 0xF, y & 0xF, z & 0xF);
         }
diff --git a/connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaChunkDataTranslator.java b/connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaChunkDataTranslator.java
index 8c6720863..0b2b1ce5f 100644
--- a/connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaChunkDataTranslator.java
+++ b/connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaChunkDataTranslator.java
@@ -37,14 +37,16 @@ import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.ByteBufOutputStream;
 import org.geysermc.connector.GeyserConnector;
 import org.geysermc.connector.network.session.GeyserSession;
-import org.geysermc.connector.utils.BiomeUtils;
 import org.geysermc.connector.network.translators.PacketTranslator;
 import org.geysermc.connector.network.translators.Translator;
 import org.geysermc.connector.network.translators.world.chunk.ChunkSection;
+import org.geysermc.connector.utils.BiomeUtils;
 import org.geysermc.connector.utils.ChunkUtils;
 
 @Translator(packet = ServerChunkDataPacket.class)
 public class JavaChunkDataTranslator extends PacketTranslator<ServerChunkDataPacket> {
+    // Caves and cliffs supports 3D biomes by implementing a very similar palette system to blocks
+    private static final boolean NEW_BIOME_WRITE = GeyserConnector.getInstance().getConfig().isExtendedWorldHeight();
 
     @Override
     public void translate(ServerChunkDataPacket packet, GeyserSession session) {
@@ -79,7 +81,7 @@ public class JavaChunkDataTranslator extends PacketTranslator<ServerChunkDataPac
                     ChunkSection section = sections[i];
                     size += (section != null ? section : session.getBlockMappings().getEmptyChunkSection()).estimateNetworkSize();
                 }
-                size += 256; // Biomes
+                size += 256; // Biomes pre-1.18
                 size += 1; // Border blocks
                 size += 1; // Extra data length (always 0)
                 size += chunkData.getBlockEntities().length * 64; // Conservative estimate of 64 bytes per tile entity
@@ -93,7 +95,18 @@ public class JavaChunkDataTranslator extends PacketTranslator<ServerChunkDataPac
                         (section != null ? section : session.getBlockMappings().getEmptyChunkSection()).writeToNetwork(byteBuf);
                     }
 
-                    byteBuf.writeBytes(BiomeUtils.toBedrockBiome(column.getBiomeData())); // Biomes - 256 bytes
+                    if (NEW_BIOME_WRITE) {
+                        for (int i = 0; i < sectionCount; i++) {
+                            BiomeUtils.toNewBedrockBiome(column.getBiomeData(), i).writeToNetwork(byteBuf);
+                        }
+
+                        int remainingEmptyBiomes = 32 - sectionCount;
+                        for (int i = 0; i < remainingEmptyBiomes; i++) {
+                            byteBuf.writeBytes(ChunkUtils.EMPTY_BIOME_DATA);
+                        }
+                    } else {
+                        byteBuf.writeBytes(BiomeUtils.toBedrockBiome(column.getBiomeData())); // Biomes - 256 bytes
+                    }
                     byteBuf.writeByte(0); // Border blocks - Edu edition only
                     VarInts.writeUnsignedInt(byteBuf, 0); // extra data length, 0 for now
 
diff --git a/connector/src/main/java/org/geysermc/connector/utils/BiomeUtils.java b/connector/src/main/java/org/geysermc/connector/utils/BiomeUtils.java
index 650367a4a..db9edacb4 100644
--- a/connector/src/main/java/org/geysermc/connector/utils/BiomeUtils.java
+++ b/connector/src/main/java/org/geysermc/connector/utils/BiomeUtils.java
@@ -25,6 +25,8 @@
 
 package org.geysermc.connector.utils;
 
+import org.geysermc.connector.network.translators.world.chunk.BlockStorage;
+
 import java.util.Arrays;
 
 // Based off of ProtocolSupport's LegacyBiomeData.java:
@@ -40,7 +42,7 @@ public class BiomeUtils {
         for (int y = 0; y < 16; y += 4) {
             for (int z = 0; z < 16; z += 4) {
                 for (int x = 0; x < 16; x += 4) {
-                    byte biomeId = biomeID(biomeData, x, y, z);
+                    byte biomeId = (byte) biomeID(biomeData, x, y, z);
                     int offset = ((z + (y / 4)) << 4) | x;
                     Arrays.fill(bedrockData, offset, offset + 4, biomeId);
                 }
@@ -49,7 +51,25 @@ public class BiomeUtils {
         return bedrockData;
     }
 
-    private static byte biomeID(int[] biomeData, int x, int y, int z) {
+    public static BlockStorage toNewBedrockBiome(int[] biomeData, int ySection) {
+        BlockStorage storage = new BlockStorage(0);
+        int blockY = ySection << 4;
+        int i = 0;
+        // Iterate over biomes like a chunk, grab the biome from Java, and add it to Bedrock's biome palette
+        // Might be able to be optimized by iterating over Java's biome data section?? Unsure.
+        for (int x = 0; x < 16; x++) {
+            for (int z = 0; z < 16; z++) {
+                for (int y = blockY; y < (blockY + 16); y++) {
+                    int biomeId = biomeID(biomeData, x, y, z);
+                    storage.setFullBlock(i, biomeId);
+                    i++;
+                }
+            }
+        }
+        return storage;
+    }
+
+    private static int biomeID(int[] biomeData, int x, int y, int z) {
         int biomeId = biomeData[((y >> 2) & 63) << 4 | ((z >> 2) & 3) << 2 | ((x >> 2) & 3)];
         if (biomeId == 0) {
             biomeId = 42; // Ocean
@@ -58,6 +78,6 @@ public class BiomeUtils {
         } else if (biomeId >= 170) { // Nether biomes. Dunno why it's like this :microjang:
             biomeId += 8;
         }
-        return (byte) biomeId;
+        return biomeId;
     }
 }
diff --git a/connector/src/main/java/org/geysermc/connector/utils/ChunkUtils.java b/connector/src/main/java/org/geysermc/connector/utils/ChunkUtils.java
index 77f0d2c90..912d0e8ee 100644
--- a/connector/src/main/java/org/geysermc/connector/utils/ChunkUtils.java
+++ b/connector/src/main/java/org/geysermc/connector/utils/ChunkUtils.java
@@ -41,6 +41,8 @@ import com.nukkitx.nbt.NbtMap;
 import com.nukkitx.protocol.bedrock.packet.LevelChunkPacket;
 import com.nukkitx.protocol.bedrock.packet.NetworkChunkPublisherUpdatePacket;
 import com.nukkitx.protocol.bedrock.packet.UpdateBlockPacket;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntList;
 import lombok.Data;
@@ -71,11 +73,41 @@ public class ChunkUtils {
     /**
      * The minimum height Bedrock Edition will accept.
      */
-    private static final int MINIMUM_ACCEPTED_HEIGHT = GeyserConnector.getInstance().getConfig().isExtendedWorldHeight() ? -64 : 0;
+    private static final int MINIMUM_ACCEPTED_HEIGHT = 0;
+    private static final int MINIMUM_ACCEPTED_HEIGHT_OVERWORLD = GeyserConnector.getInstance().getConfig().isExtendedWorldHeight() ? -64 : MINIMUM_ACCEPTED_HEIGHT;
     /**
      * The maximum chunk height Bedrock Edition will accept, from the lowest point to the highest.
      */
-    private static final int MAXIMUM_ACCEPTED_HEIGHT = GeyserConnector.getInstance().getConfig().isExtendedWorldHeight() ? 380 : 256;
+    private static final int MAXIMUM_ACCEPTED_HEIGHT = 256;
+    private static final int MAXIMUM_ACCEPTED_HEIGHT_OVERWORLD = GeyserConnector.getInstance().getConfig().isExtendedWorldHeight() ? 384 : MAXIMUM_ACCEPTED_HEIGHT;
+
+    private static final byte[] EMPTY_CHUNK_DATA;
+    public static final byte[] EMPTY_BIOME_DATA;
+
+    static {
+        ByteBuf byteBuf = Unpooled.buffer();
+        try {
+            BlockStorage blockStorage = new BlockStorage(0);
+            blockStorage.writeToNetwork(byteBuf);
+
+            EMPTY_BIOME_DATA = new byte[byteBuf.readableBytes()];
+            byteBuf.readBytes(EMPTY_BIOME_DATA);
+        } finally {
+            byteBuf.release();
+        }
+
+        byteBuf = Unpooled.buffer();
+        try {
+            for (int i = 0; i < 32; i++) {
+                byteBuf.writeBytes(EMPTY_BIOME_DATA);
+            }
+
+            EMPTY_CHUNK_DATA = new byte[byteBuf.readableBytes()];
+            byteBuf.readBytes(EMPTY_CHUNK_DATA);
+        } finally {
+            byteBuf.release();
+        }
+    }
 
     private static int indexYZXtoXZY(int yzx) {
         return (yzx >> 8) | (yzx & 0x0F0) | ((yzx & 0x00F) << 8);
@@ -91,8 +123,10 @@ public class ChunkUtils {
         BitSet waterloggedPaletteIds = new BitSet();
         BitSet pistonOrFlowerPaletteIds = new BitSet();
 
+        boolean overworld = session.getDimension().equals(DimensionUtils.OVERWORLD);
+
         for (int sectionY = 0; sectionY < javaSections.length; sectionY++) {
-            if (yOffset < MINIMUM_ACCEPTED_HEIGHT && sectionY < -yOffset) {
+            if (yOffset < ((overworld ? MINIMUM_ACCEPTED_HEIGHT_OVERWORLD : MINIMUM_ACCEPTED_HEIGHT) >> 4) && sectionY < -yOffset) {
                 // Ignore this chunk since it goes below the accepted height limit
                 continue;
             }
@@ -128,7 +162,7 @@ public class ChunkUtils {
                         ));
                     }
                 }
-                sections[sectionY + yOffset] = section;
+                sections[sectionY + (yOffset - ((overworld ? MINIMUM_ACCEPTED_HEIGHT_OVERWORLD : MINIMUM_ACCEPTED_HEIGHT) >> 4))] = section;
                 continue;
             }
 
@@ -201,7 +235,7 @@ public class ChunkUtils {
                 layers = new BlockStorage[]{ layer0, new BlockStorage(BitArrayVersion.V1.createArray(BlockStorage.SIZE, layer1Data), layer1Palette) };
             }
 
-            sections[sectionY + yOffset] = new ChunkSection(layers);
+            sections[sectionY + (yOffset - ((overworld ? MINIMUM_ACCEPTED_HEIGHT_OVERWORLD : MINIMUM_ACCEPTED_HEIGHT) >> 4))] = new ChunkSection(layers);
         }
 
         CompoundTag[] blockEntities = column.getTileEntities();
@@ -383,7 +417,7 @@ public class ChunkUtils {
                 data.setChunkX(chunkX + x);
                 data.setChunkZ(chunkZ + z);
                 data.setSubChunksLength(0);
-                data.setData(new byte[0]);
+                data.setData(EMPTY_CHUNK_DATA);
                 data.setCachingEnabled(false);
                 session.sendUpstreamPacket(data);