diff --git a/Cargo.lock b/Cargo.lock
index 6afa0ec08..28c943b26 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -211,6 +211,19 @@ dependencies = [
  "serde_bytes",
 ]
 
+[[package]]
+name = "fastsnbt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51b48b5b742a5441eb6dac3dfe2c2bd048e91fd8e98abf266b4d9f89972aa8ec"
+dependencies = [
+ "byteorder",
+ "itoa",
+ "nom",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "fdeflate"
 version = "0.3.4"
@@ -333,6 +346,12 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.7.4"
@@ -356,6 +375,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "num-bigint"
 version = "0.4.6"
@@ -506,6 +535,7 @@ dependencies = [
  "cfb8",
  "crossbeam-channel",
  "fastnbt",
+ "fastsnbt",
  "flate2",
  "image",
  "log",
diff --git a/pumpkin/Cargo.toml b/pumpkin/Cargo.toml
index e2cd8fbab..7979b44f4 100644
--- a/pumpkin/Cargo.toml
+++ b/pumpkin/Cargo.toml
@@ -30,4 +30,6 @@ crossbeam-channel = "0.5.13"
 uuid = "1.10"
 toml = "0.8.17"
 fastnbt = "2.5.0"
+fastsnbt = "0.2"
+
 
diff --git a/pumpkin/src/client/client_packet.rs b/pumpkin/src/client/client_packet.rs
index 747ec1587..42e3588eb 100644
--- a/pumpkin/src/client/client_packet.rs
+++ b/pumpkin/src/client/client_packet.rs
@@ -1,7 +1,7 @@
 use crate::{
     protocol::{
         client::{
-            config::{CFinishConfig, CKnownPacks, CPluginMessage, CRegistryData, Entry},
+            config::{CFinishConfig, CKnownPacks, CRegistryData, Entry},
             login::{CEncryptionRequest, CLoginSuccess},
             status::{CPingResponse, CStatusResponse},
         },
@@ -83,10 +83,8 @@ impl ClientPacketProcessor for Client {
         let verify_token: [u8; 4] = rand::random();
         let public_key_der = &server.public_key_der;
         let packet = CEncryptionRequest::new(
-            "".into(),
-            public_key_der.len() as i32,
+            "",
             public_key_der,
-            verify_token.len() as i32,
             &verify_token,
             false, // TODO
         );
@@ -101,7 +99,7 @@ impl ClientPacketProcessor for Client {
         dbg!("encryption response");
         // should be impossible
         if self.uuid.is_none() || self.name.is_none() {
-            self.kick("UUID or Name is none".into());
+            self.kick("UUID or Name is none");
             return;
         }
         self.enable_encryption(server, encryption_response.shared_secret)
@@ -126,14 +124,11 @@ impl ClientPacketProcessor for Client {
         self.connection_state = ConnectionState::Config;
         Server::send_brand(self);
         // known data packs
-        self.send_packet(CKnownPacks::new(
-            1,
-            &[KnownPack {
-                namespace: "minecraft".to_string(),
-                id: "core".to_string(),
-                version: "1.21".to_string(),
-            }],
-        ));
+        self.send_packet(CKnownPacks::new(&[KnownPack {
+            namespace: "minecraft",
+            id: "core",
+            version: "1.21",
+        }]));
         dbg!("login achnowlaged");
     }
     fn handle_client_information(
@@ -155,11 +150,10 @@ impl ClientPacketProcessor for Client {
 
     fn handle_known_packs(&mut self, server: &mut Server, config_acknowledged: SKnownPacks) {
         self.send_packet(CRegistryData::new(
-            "0".into(),
-            1,
-            vec![
+            "dimension_type",
+            &[
                 Entry {
-                    entry_id: "minecraft:dimension_type".into(),
+                    entry_id: "minecraft:dimension_type",
                     has_data: true,
                 },
                 /*    Entry {
diff --git a/pumpkin/src/client/mod.rs b/pumpkin/src/client/mod.rs
index 4e928093d..feb20806a 100644
--- a/pumpkin/src/client/mod.rs
+++ b/pumpkin/src/client/mod.rs
@@ -222,7 +222,7 @@ impl Client {
         Ok(self.closed)
     }
 
-    pub fn kick(&mut self, reason: String) {
+    pub fn kick(&mut self, reason: &str) {
         // Todo
         match self.connection_state {
             ConnectionState::Login => {
diff --git a/pumpkin/src/client/packet_decoder.rs b/pumpkin/src/client/packet_decoder.rs
index 4792d1495..efb6699b3 100644
--- a/pumpkin/src/client/packet_decoder.rs
+++ b/pumpkin/src/client/packet_decoder.rs
@@ -56,7 +56,7 @@ impl PacketDecoder {
         Ok(Some(RawPacket {
             len: packet_len,
             id: packet_id,
-            bytebuf: ByteBuffer::new(BytesMut::from(data)),
+            bytebuf: ByteBuffer::new(data),
         }))
     }
 
diff --git a/pumpkin/src/protocol/bytebuf/mod.rs b/pumpkin/src/protocol/bytebuf/mod.rs
index 8ff23a98b..0bbb3a1dc 100644
--- a/pumpkin/src/protocol/bytebuf/mod.rs
+++ b/pumpkin/src/protocol/bytebuf/mod.rs
@@ -1,5 +1,5 @@
 use core::str;
-use std::io::{self, Error, ErrorKind, Read, Write};
+use std::io::{self, Error, ErrorKind};
 
 use bytes::{Buf, BufMut, BytesMut};
 
@@ -180,17 +180,17 @@ impl ByteBuffer {
         self.put_list(v, |p, &v| p.put_var_int(v))
     }
 
-    /* pub fn get_nbt(&mut self) -> Option<crab_nbt::NbtTag> {
-        match crab_nbt::NbtTag::deserialize(self.buf()) {
-            Ok(v) => Some(v),
-            Err(err) => None,
+    /*  pub fn get_nbt(&mut self) -> Option<fastnbt::value::Value> {
+            match crab_nbt::NbtTag::deserialize(self.buf()) {
+                Ok(v) => Some(v),
+                Err(err) => None,
+            }
         }
-    }
-
-    pub fn put_nbt(&mut self, nbt: NbtTag) {
-        self.buffer.put_slice(&nbt.serialize());
-        } */
 
+        pub fn put_nbt(&mut self, nbt: N) {
+            self.buffer.put_slice(&nbt.serialize());
+        }
+    */
     pub fn buf(&mut self) -> &mut BytesMut {
         &mut self.buffer
     }
diff --git a/pumpkin/src/protocol/client/config/mod.rs b/pumpkin/src/protocol/client/config/mod.rs
index a4f6799b2..aa4e72099 100644
--- a/pumpkin/src/protocol/client/config/mod.rs
+++ b/pumpkin/src/protocol/client/config/mod.rs
@@ -26,25 +26,25 @@ impl<'a> ClientPacket for CPluginMessage<'a> {
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
         bytebuf.put_string(&self.channel);
-        bytebuf.put_slice(&self.data);
+        bytebuf.put_slice(self.data);
     }
 }
 
-pub struct CConfigDisconnect {
-    reason: String,
+pub struct CConfigDisconnect<'a> {
+    reason: &'a str,
 }
 
-impl CConfigDisconnect {
-    pub fn new(reason: String) -> Self {
+impl<'a> CConfigDisconnect<'a> {
+    pub fn new(reason: &'a str) -> Self {
         Self { reason }
     }
 }
 
-impl ClientPacket for CConfigDisconnect {
+impl<'a> ClientPacket for CConfigDisconnect<'a> {
     const PACKET_ID: crate::protocol::VarInt = 0x02;
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
-        bytebuf.put_string(&self.reason);
+        bytebuf.put_string(self.reason);
     }
 }
 
@@ -69,13 +69,12 @@ impl ClientPacket for CFinishConfig {
 }
 
 pub struct CKnownPacks<'a> {
-    count: VarInt,
-    known_packs: &'a [KnownPack],
+    known_packs: &'a [KnownPack<'a>],
 }
 
 impl<'a> CKnownPacks<'a> {
-    pub fn new(count: VarInt, known_packs: &'a [KnownPack]) -> Self {
-        Self { count, known_packs }
+    pub fn new(known_packs: &'a [KnownPack]) -> Self {
+        Self { known_packs }
     }
 }
 
@@ -83,47 +82,43 @@ impl<'a> ClientPacket for CKnownPacks<'a> {
     const PACKET_ID: VarInt = 0x0E;
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
-        //  bytebuf.write_var_int(self.count);
-        bytebuf.put_list::<KnownPack>(&self.known_packs, |p, v| {
-            p.put_string(&v.namespace);
-            p.put_string(&v.id);
-            p.put_string(&v.version);
+        bytebuf.put_list::<KnownPack>(self.known_packs, |p, v| {
+            p.put_string(v.namespace);
+            p.put_string(v.id);
+            p.put_string(v.version);
         });
     }
 }
 
-pub struct CRegistryData {
-    registry_id: String,
-    entry_count: VarInt,
-    entries: Vec<Entry>,
+pub struct CRegistryData<'a> {
+    registry_id: &'a str,
+    entries: &'a [Entry<'a>],
 }
 
-impl CRegistryData {
-    pub fn new(registry_id: String, entry_count: VarInt, entries: Vec<Entry>) -> Self {
+impl<'a> CRegistryData<'a> {
+    pub fn new(registry_id: &'a str, entries: &'a [Entry]) -> Self {
         Self {
             registry_id,
-            entry_count,
             entries,
         }
     }
 }
 
-pub struct Entry {
-    pub entry_id: String,
+pub struct Entry<'a> {
+    pub entry_id: &'a str,
     pub has_data: bool,
     // data provided by registry::write_codec
 }
 
-impl ClientPacket for CRegistryData {
+impl<'a> ClientPacket for CRegistryData<'a> {
     const PACKET_ID: VarInt = 0x07;
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
-        bytebuf.put_string(&self.registry_id);
-        bytebuf.put_var_int(self.entry_count);
-        bytebuf.put_list::<Entry>(&self.entries, |p, v| {
-            p.put_string(&v.entry_id);
+        bytebuf.put_string(self.registry_id);
+        bytebuf.put_list::<Entry>(self.entries, |p, v| {
+            p.put_string(v.entry_id);
             p.put_bool(v.has_data);
-            registry::write_single_dimension(p, -64, 320);
+            registry::write_codec(p, -64, 384);
         });
     }
 }
diff --git a/pumpkin/src/protocol/client/login/mod.rs b/pumpkin/src/protocol/client/login/mod.rs
index 1a80fd819..cbccab05a 100644
--- a/pumpkin/src/protocol/client/login/mod.rs
+++ b/pumpkin/src/protocol/client/login/mod.rs
@@ -1,16 +1,16 @@
 use crate::protocol::{bytebuf::ByteBuffer, ClientPacket, VarInt};
 
-pub struct CLoginDisconnect {
-    reason: String,
+pub struct CLoginDisconnect<'a> {
+    reason: &'a str,
 }
 
-impl CLoginDisconnect {
-    pub fn new(reason: String) -> Self {
+impl<'a> CLoginDisconnect<'a> {
+    pub fn new(reason: &'a str) -> Self {
         Self { reason }
     }
 }
 
-impl ClientPacket for CLoginDisconnect {
+impl<'a> ClientPacket for CLoginDisconnect<'a> {
     const PACKET_ID: VarInt = 0x00;
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
@@ -19,28 +19,22 @@ impl ClientPacket for CLoginDisconnect {
 }
 
 pub struct CEncryptionRequest<'a> {
-    server_id: String, // 20
-    public_key_length: VarInt,
+    server_id: &'a str, // 20
     public_key: &'a [u8],
-    verify_token_length: VarInt,
     verify_token: &'a [u8],
     should_authenticate: bool,
 }
 
 impl<'a> CEncryptionRequest<'a> {
     pub fn new(
-        server_id: String,
-        public_key_length: VarInt,
+        server_id: &'a str,
         public_key: &'a [u8],
-        verify_token_length: VarInt,
         verify_token: &'a [u8],
         should_authenticate: bool,
     ) -> Self {
         Self {
             server_id,
-            public_key_length,
             public_key,
-            verify_token_length,
             verify_token,
             should_authenticate,
         }
@@ -51,10 +45,10 @@ impl<'a> ClientPacket for CEncryptionRequest<'a> {
     const PACKET_ID: VarInt = 0x01;
 
     fn write(&self, bytebuf: &mut ByteBuffer) {
-        bytebuf.put_string(self.server_id.as_str());
-        bytebuf.put_var_int(self.public_key_length);
+        bytebuf.put_string(self.server_id);
+        bytebuf.put_var_int(self.public_key.len() as VarInt);
         bytebuf.put_slice(self.public_key);
-        bytebuf.put_var_int(self.verify_token_length);
+        bytebuf.put_var_int(self.verify_token.len() as VarInt);
         bytebuf.put_slice(self.verify_token);
         bytebuf.put_bool(self.should_authenticate);
     }
diff --git a/pumpkin/src/protocol/mod.rs b/pumpkin/src/protocol/mod.rs
index 4cb711be2..f3c959dcb 100644
--- a/pumpkin/src/protocol/mod.rs
+++ b/pumpkin/src/protocol/mod.rs
@@ -124,7 +124,7 @@ pub trait ClientPacket {
     fn write(&self, bytebuf: &mut ByteBuffer);
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize)]
 pub struct StatusResponse {
     pub version: Version,
     pub players: Players,
@@ -132,27 +132,27 @@ pub struct StatusResponse {
     pub favicon: String, // data:image/png;base64,<data>
                          // Players, favicon ...
 }
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize)]
 pub struct Version {
     pub name: String,
     pub protocol: u32,
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize)]
 pub struct Players {
     pub max: u32,
     pub online: u32,
     pub sample: Vec<Sample>,
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize)]
 pub struct Sample {
     pub name: String,
     pub id: String, // uuid
 }
 
-pub struct KnownPack {
-    pub namespace: String,
-    pub id: String,
-    pub version: String,
+pub struct KnownPack<'a> {
+    pub namespace: &'a str,
+    pub id: &'a str,
+    pub version: &'a str,
 }
diff --git a/pumpkin/src/protocol/registry/biomes.rs b/pumpkin/src/protocol/registry/biomes.rs
index fa1fbd79a..351da43e0 100644
--- a/pumpkin/src/protocol/registry/biomes.rs
+++ b/pumpkin/src/protocol/registry/biomes.rs
@@ -1,6 +1,6 @@
 use crate::protocol::VarInt;
 
-use super::CodecItem;
+use super::RegistryValue;
 use serde::Serialize;
 
 #[derive(Debug, Clone, Serialize)]
@@ -72,7 +72,7 @@ struct Music {
 }
 
 // 1.20.6 default https://gist.github.com/WinX64/ab8c7a8df797c273b32d3a3b66522906
-pub(super) fn all() -> Vec<CodecItem<Biome>> {
+pub(super) fn all() -> Vec<RegistryValue<Biome>> {
     let biome = Biome {
         has_precipitation: false,
         temperature: 1.0,
@@ -99,7 +99,7 @@ pub(super) fn all() -> Vec<CodecItem<Biome>> {
         },
     };
 
-    vec![CodecItem {
+    vec![RegistryValue {
         name: "minecraft:plains".into(),
         id: 0,
         element: biome,
diff --git a/pumpkin/src/protocol/registry/chat_type.rs b/pumpkin/src/protocol/registry/chat_type.rs
index 66bc22792..27da25a17 100644
--- a/pumpkin/src/protocol/registry/chat_type.rs
+++ b/pumpkin/src/protocol/registry/chat_type.rs
@@ -1,4 +1,4 @@
-use super::CodecItem;
+use super::RegistryValue;
 use serde::Serialize;
 
 #[derive(Debug, Clone, Serialize)]
@@ -13,8 +13,8 @@ struct Decoration {
     parameters: Vec<String>,
 }
 
-pub(super) fn all() -> Vec<CodecItem<ChatType>> {
-    vec![CodecItem {
+pub(super) fn all() -> Vec<RegistryValue<ChatType>> {
+    vec![RegistryValue {
         name: "minecraft:chat".into(),
         id: 0,
         element: ChatType {
diff --git a/pumpkin/src/protocol/registry/damage_type.rs b/pumpkin/src/protocol/registry/damage_type.rs
index 669bc41de..10e54c06a 100644
--- a/pumpkin/src/protocol/registry/damage_type.rs
+++ b/pumpkin/src/protocol/registry/damage_type.rs
@@ -1,6 +1,7 @@
-use super::CodecItem;
 use serde::Serialize;
 
+use super::RegistryValue;
+
 #[derive(Debug, Clone, Serialize)]
 pub struct DamageType {
     message_id: String,
@@ -60,10 +61,10 @@ const NAMES: &[&str] = &[
     "wither_skull",
 ];
 
-pub(super) fn all() -> Vec<CodecItem<DamageType>> {
+pub(super) fn all() -> Vec<RegistryValue<DamageType>> {
     let mut items: Vec<_> = NAMES
         .iter()
-        .map(|name| CodecItem {
+        .map(|name| RegistryValue {
             name: (*name).into(),
             id: 0,
             element: DamageType {
diff --git a/pumpkin/src/protocol/registry/dimensions.rs b/pumpkin/src/protocol/registry/dimensions.rs
index fd9782c04..9e539028f 100644
--- a/pumpkin/src/protocol/registry/dimensions.rs
+++ b/pumpkin/src/protocol/registry/dimensions.rs
@@ -1,48 +1,83 @@
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 
-#[derive(Debug, Clone, Serialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Dimension {
-    #[serde(skip_serializing_if = "Option::is_none")]
-    fixed_time: Option<f64>,
-    has_skylight: bool,
-    has_ceiling: bool,
-    ultrawarm: bool,
-    natural: bool,
-    coordinate_scale: f64,
+    pub ambient_light: f32,
     bed_works: bool,
-    respawn_anchor_works: bool,
-    min_y: i32,
-    height: i32,
-    logical_height: i32,
-    infiniburn: String,
-    effects: String,
-    ambient_light: f32,
-    piglin_safe: bool,
+    coordinate_scale: f64,
+    effects: DimensionEffects,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    fixed_time: Option<i32>,
+    has_ceiling: bool,
     has_raids: bool,
-    monster_spawn_light_level: i32,
+    has_skylight: bool,
+    height: i32,
+    infiniburn: String,
+    logical_height: i32,
+    min_y: i32,
     monster_spawn_block_light_limit: i32,
+    monster_spawn_light_level: MonsterSpawnLightLevel,
+    natural: bool,
+    piglin_safe: bool,
+    respawn_anchor_works: bool,
+    ultrawarm: bool,
 }
 
-pub fn overworld(world_min_y: i32, world_height: u32) -> Dimension {
-    Dimension {
-        piglin_safe: false,
-        natural: true,
-        ambient_light: 0.0,
-        fixed_time: Some(6000.0),
-        infiniburn: "#minecraft:infiniburn_overworld".into(),
-        respawn_anchor_works: false,
-        has_skylight: true,
-        bed_works: true,
-        effects: "minecraft:overworld".into(),
-        has_raids: false,
-        logical_height: 384,
-        coordinate_scale: 1.0,
-        ultrawarm: false,
-        has_ceiling: false,
-        min_y: world_min_y,
-        height: (world_height as i32 + 15) / 16 * 16,
+#[derive(Serialize, Deserialize, Clone, Copy, PartialEq, Eq, Default, Debug)]
+pub enum DimensionEffects {
+    #[serde(rename = "minecraft:overworld")]
+    #[default]
+    Overworld,
+    #[serde(rename = "minecraft:the_nether")]
+    TheNether,
+    #[serde(rename = "minecraft:the_end")]
+    TheEnd,
+}
 
-        monster_spawn_light_level: 7,
-        monster_spawn_block_light_limit: 7,
+impl Default for Dimension {
+    fn default() -> Self {
+        Self {
+            ambient_light: 0.0,
+            bed_works: true,
+            coordinate_scale: 1.0,
+            effects: DimensionEffects::default(),
+            fixed_time: None,
+            has_ceiling: false,
+            has_raids: true,
+            has_skylight: true,
+            height: 384,
+            infiniburn: "#minecraft:infiniburn_overworld".into(),
+            logical_height: 384,
+            min_y: -64,
+            monster_spawn_block_light_limit: 0,
+            monster_spawn_light_level: MonsterSpawnLightLevel::Int(7),
+            natural: true,
+            piglin_safe: false,
+            respawn_anchor_works: false,
+            ultrawarm: false,
+        }
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum MonsterSpawnLightLevel {
+    Int(i32),
+    Tagged(MonsterSpawnLightLevelTagged),
+}
+
+#[derive(Copy, Clone, PartialEq, Debug, Serialize, Deserialize)]
+#[serde(tag = "type", content = "value")]
+pub enum MonsterSpawnLightLevelTagged {
+    #[serde(rename = "minecraft:uniform")]
+    Uniform {
+        min_inclusive: i32,
+        max_inclusive: i32,
+    },
+}
+
+impl From<i32> for MonsterSpawnLightLevel {
+    fn from(value: i32) -> Self {
+        Self::Int(value)
     }
 }
diff --git a/pumpkin/src/protocol/registry/mod.rs b/pumpkin/src/protocol/registry/mod.rs
index d30ad43aa..a933dbb10 100644
--- a/pumpkin/src/protocol/registry/mod.rs
+++ b/pumpkin/src/protocol/registry/mod.rs
@@ -1,3 +1,4 @@
+use dimensions::Dimension;
 use serde::Serialize;
 
 use super::bytebuf::ByteBuffer;
@@ -11,45 +12,55 @@ mod dimensions;
 struct LoginInfo {
     #[serde(rename = "minecraft:dimension_type")]
     dimensions: Codec<dimensions::Dimension>,
-    #[serde(rename = "minecraft:worldgen/biome")]
+    /*   #[serde(rename = "minecraft:worldgen/biome")]
     biomes: Codec<biomes::Biome>,
     #[serde(rename = "minecraft:chat_type")]
     chat: Codec<chat_type::ChatType>,
     #[serde(rename = "minecraft:damage_type")]
-    damage: Codec<damage_type::DamageType>,
+    damage: Codec<damage_type::DamageType>, */
 }
 
 #[derive(Debug, Clone, Serialize)]
 struct Codec<T> {
     #[serde(rename = "type")]
     ty: String,
-    value: Vec<CodecItem<T>>,
+    value: Vec<RegistryValue<T>>,
 }
 #[derive(Debug, Clone, Serialize)]
-struct CodecItem<T> {
+struct RegistryValue<T> {
     name: String,
     id: i32,
     element: T,
 }
 
 pub fn write_single_dimension(out: &mut ByteBuffer, world_min_y: i32, world_height: u32) {
-    let dimension = dimensions::overworld(world_min_y, world_height);
-  //  out.put_nbt(nbt!(dimension))
+    let dimension = Dimension::default();
+    let nbt = Codec {
+        ty: "minecraft:dimension_type".into(),
+        value: vec![RegistryValue {
+            name: "minecraft:overworld".into(),
+            id: 0,
+            element: dimension,
+        }],
+    };
+    let val = &fastsnbt::to_string(&nbt).unwrap();
+    dbg!(val);
+    out.put_string(val);
 }
 
 pub fn write_codec(out: &mut ByteBuffer, world_min_y: i32, world_height: u32) {
-    let dimension = dimensions::overworld(world_min_y, world_height);
+    let dimension = Dimension::default();
 
     let info = LoginInfo {
         dimensions: Codec {
             ty: "minecraft:dimension_type".into(),
-            value: vec![CodecItem {
+            value: vec![RegistryValue {
                 name: "minecraft:overworld".into(),
                 id: 0,
                 element: dimension,
             }],
         },
-        biomes: Codec {
+        /* biomes: Codec {
             ty: "minecraft:worldgen/biome".into(),
             value: biomes::all(),
         },
@@ -60,11 +71,13 @@ pub fn write_codec(out: &mut ByteBuffer, world_min_y: i32, world_height: u32) {
         damage: Codec {
             ty: "minecraft:damage_type".into(),
             value: damage_type::all(),
-        },
+            }, */
     };
 
+    let val = &fastsnbt::to_string(&info).unwrap();
+    dbg!(val);
     // Dimension codec
-    // out.put_slice(&nbt::to_nbt("", &info).unwrap().serialize());
+    out.put_string(val);
     // Current dimension type (key in dimension codec)
     out.put_string("minecraft:overworld");
     // Current world
diff --git a/pumpkin/src/server.rs b/pumpkin/src/server.rs
index 3ff33afb1..8765e055e 100644
--- a/pumpkin/src/server.rs
+++ b/pumpkin/src/server.rs
@@ -16,10 +16,7 @@ use crate::{
         Entity, EntityId,
     },
     protocol::{
-        client::{
-            config::{CFinishConfig, CKnownPacks, CPluginMessage, CRegistryData, Entry},
-            play::CLogin,
-        },
+        client::{config::CPluginMessage, play::CLogin},
         Players, Sample, StatusResponse, VarInt, VarInt32, Version,
     },
     world::World,
diff --git a/pumpkin/src/world.rs b/pumpkin/src/world.rs
index 2f8927440..2fabe1134 100644
--- a/pumpkin/src/world.rs
+++ b/pumpkin/src/world.rs
@@ -4,6 +4,12 @@ pub struct World {
     pub players: Vec<Player>,
 }
 
+impl Default for World {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl World {
     pub fn new() -> Self {
         Self {