diff --git a/pumpkin-protocol/src/bytebuf/mod.rs b/pumpkin-protocol/src/bytebuf/mod.rs
index f26785d17..7f4ab6f12 100644
--- a/pumpkin-protocol/src/bytebuf/mod.rs
+++ b/pumpkin-protocol/src/bytebuf/mod.rs
@@ -3,7 +3,7 @@ use std::io::{self, Error, ErrorKind};
 
 use bytes::{Buf, BufMut, BytesMut};
 
-use crate::{VarInt, VarLong};
+use crate::{BitSet, VarInt, VarLong};
 
 const SEGMENT_BITS: u8 = 0x7F;
 const CONTINUE_BIT: u8 = 0x80;
@@ -141,6 +141,13 @@ impl ByteBuffer {
         }
     }
 
+    pub fn put_bit_set(&mut self, set: &BitSet) {
+        self.put_var_int(set.length);
+        for b in &set.data {
+            self.put_i64(*b);
+        }
+    }
+
     /// Reads a boolean. If true, the closure is called, and the returned value is
     /// wrapped in Some. Otherwise, this returns None.
     pub fn get_option<T>(&mut self, val: impl FnOnce(&mut Self) -> T) -> Option<T> {
diff --git a/pumpkin-protocol/src/client/play/mod.rs b/pumpkin-protocol/src/client/play/mod.rs
index adf6bb2e8..55d90b8db 100644
--- a/pumpkin-protocol/src/client/play/mod.rs
+++ b/pumpkin-protocol/src/client/play/mod.rs
@@ -1,4 +1,4 @@
-use crate::{bytebuf::ByteBuffer, ClientPacket, VarInt};
+use crate::{bytebuf::ByteBuffer, BitSet, ClientPacket, VarInt};
 
 pub struct SetHeldItem {
     slot: i8,
@@ -233,3 +233,88 @@ impl ClientPacket for CSyncPlayerPostion {
         bytebuf.put_var_int(self.teleport_id);
     }
 }
+
+pub struct CChunkDataUpdateLight {
+    chunk_x: i32,
+    chunk_y: i32,
+    heightmaps: Vec<u8>,
+    data: Vec<u8>,
+    block_entites: Vec<BlockEntity>,
+    sky_light_mask: BitSet,
+    block_light_mask: BitSet,
+    empty_sky_light_mask: BitSet,
+    sky_lights: Vec<SkyLight>,
+    block_lights: Vec<BlockLight>,
+}
+
+impl CChunkDataUpdateLight {
+    pub fn new(
+        chunk_x: i32,
+        chunk_y: i32,
+        heightmaps: Vec<u8>,
+        data: Vec<u8>,
+        block_entites: Vec<BlockEntity>,
+        sky_light_mask: BitSet,
+        block_light_mask: BitSet,
+        empty_sky_light_mask: BitSet,
+        sky_lights: Vec<SkyLight>,
+        block_lights: Vec<BlockLight>,
+    ) -> Self {
+        Self {
+            chunk_x,
+            chunk_y,
+            heightmaps,
+            data,
+            block_entites,
+            sky_light_mask,
+            block_light_mask,
+            empty_sky_light_mask,
+            sky_lights,
+            block_lights,
+        }
+    }
+}
+
+impl ClientPacket for CChunkDataUpdateLight {
+    const PACKET_ID: VarInt = 0x27;
+
+    fn write(&self, bytebuf: &mut ByteBuffer) {
+        bytebuf.put_i32(self.chunk_x);
+        bytebuf.put_i32(self.chunk_y);
+        bytebuf.put_slice(&self.heightmaps);
+        bytebuf.put_var_int(self.data.len() as VarInt);
+        bytebuf.put_slice(&self.data);
+        bytebuf.put_list::<BlockEntity>(&self.block_entites, |p, v| {
+            p.put_u8(v.packed_xz);
+            p.put_i16(v.y);
+            p.put_var_int(v.typee);
+            p.put_slice(&v.data);
+        });
+        bytebuf.put_bit_set(&self.sky_light_mask);
+        bytebuf.put_bit_set(&self.block_light_mask);
+        bytebuf.put_bit_set(&self.empty_sky_light_mask);
+        bytebuf.put_list::<SkyLight>(&self.sky_lights, |p, v| {
+            p.put_var_int(v.array.len() as VarInt);
+            p.put_slice(&v.array);
+        });
+        bytebuf.put_list::<BlockLight>(&self.block_lights, |p, v| {
+            p.put_var_int(v.array.len() as VarInt);
+            p.put_slice(&v.array);
+        });
+    }
+}
+
+pub struct BlockEntity {
+    packed_xz: u8,
+    y: i16,
+    typee: VarInt,
+    data: Vec<u8>,
+}
+
+pub struct SkyLight {
+    array: Vec<u8>,
+}
+
+pub struct BlockLight {
+    array: Vec<u8>,
+}
diff --git a/pumpkin-protocol/src/lib.rs b/pumpkin-protocol/src/lib.rs
index 3008df480..6b1a5c816 100644
--- a/pumpkin-protocol/src/lib.rs
+++ b/pumpkin-protocol/src/lib.rs
@@ -19,6 +19,11 @@ pub type Identifier = String;
 pub type VarInt = i32;
 pub type VarLong = i64;
 
+pub struct BitSet {
+    length: VarInt,
+    data: Vec<i64>,
+}
+
 pub struct VarInt32(pub i32);
 
 impl VarInt32 {
diff --git a/pumpkin-registry/src/lib.rs b/pumpkin-registry/src/lib.rs
index 93fbc3b0c..4569082d3 100644
--- a/pumpkin-registry/src/lib.rs
+++ b/pumpkin-registry/src/lib.rs
@@ -1,5 +1,4 @@
 use biomes::Biome;
-use damage_type::DamageType;
 use dimensions::Dimension;
 use fastnbt::SerOpts;
 use paint::Painting;
diff --git a/pumpkin/src/server.rs b/pumpkin/src/server.rs
index f5e84547f..cf5d84788 100644
--- a/pumpkin/src/server.rs
+++ b/pumpkin/src/server.rs
@@ -141,7 +141,7 @@ impl Server {
     }
 
     // todo: do this in a world
-    fn spawn_chunks(player: &Player) {}
+    fn spawn_test_chunk(client: &Client) {}
 
     // move to world
     pub fn new_entity_id(&self) -> EntityId {