diff --git a/build.gradle b/build.gradle
index 7a6eb09..dfca467 100644
--- a/build.gradle
+++ b/build.gradle
@@ -41,8 +41,8 @@ fabricApi {
 }
 
 dependencies {
-	minecraft("com.mojang:minecraft:1.21")
-	mappings("net.fabricmc:yarn:1.21+build.9:v2")
+	minecraft("com.mojang:minecraft:1.20.5")
+	mappings("net.fabricmc:yarn:1.20.5+build.1:v2")
 	compileOnly("io.papermc.paper:paper-api:1.21.3-R0.1-SNAPSHOT")
 	compileOnly("net.md-5:bungeecord-api:1.21-R0.1-SNAPSHOT")
 	compileOnly("org.spigotmc:spigot-api:1.21.3-R0.1-SNAPSHOT")
diff --git a/src/main/java/dev/xdpxi/xdlib/api/mod/custom.java b/src/main/java/dev/xdpxi/xdlib/api/mod/custom.java
index b1cd9b5..7567921 100644
--- a/src/main/java/dev/xdpxi/xdlib/api/mod/custom.java
+++ b/src/main/java/dev/xdpxi/xdlib/api/mod/custom.java
@@ -1,5 +1,6 @@
 package dev.xdpxi.xdlib.api.mod;
 
+import dev.xdpxi.xdlib.api.mod.customClass.custom0;
 import dev.xdpxi.xdlib.api.mod.customClass.custom1;
 import dev.xdpxi.xdlib.api.mod.customClass.custom2;
 import net.fabricmc.loader.api.FabricLoader;
@@ -24,6 +25,8 @@ public static void ItemGroup(String itemGroupID, String modID, Item itemIconID,
                 custom1.ItemGroup(itemGroupID, modID, itemIconID, itemsToAdd);
             } else if (minecraftVersion.equals("1.21.2") || minecraftVersion.equals("1.21.3")) {
                 //custom2.ItemGroup(itemGroupID, modID, itemIconID, itemsToAdd);
+            } else if (minecraftVersion.equals("1.20.5") || minecraftVersion.equals("1.20.6")) {
+                custom0.ItemGroup(itemGroupID, modID, itemIconID, itemsToAdd);
             }
         } catch (Exception e) {
             throw new RuntimeException("Failed to create ItemGroup: " + e.getMessage(), e);
@@ -44,6 +47,8 @@ public static Item Item(String itemID, String modID, RegistryKey<ItemGroup> item
                 return custom1.Item(itemID, modID, itemGroup);
             } else if (minecraftVersion.equals("1.21.2") || minecraftVersion.equals("1.21.3")) {
                 //return custom2.Item(itemID, modID, itemGroup);
+            } else if (minecraftVersion.equals("1.20.5") || minecraftVersion.equals("1.20.6")) {
+                return custom0.Item(itemID, modID, itemGroup);
             }
         } catch (Exception e) {
             throw new RuntimeException("Failed to create Item: " + e.getMessage(), e);
@@ -66,6 +71,8 @@ public static BlockItem Block(String blockID, String modID, RegistryKey<ItemGrou
                 return custom1.Block(blockID, modID, itemGroup);
             } else if (minecraftVersion.equals("1.21.2") || minecraftVersion.equals("1.21.3")) {
                 //return custom2.Block(blockID, modID, itemGroup);
+            } else if (minecraftVersion.equals("1.20.5") || minecraftVersion.equals("1.20.6")) {
+                return custom0.Block(blockID, modID, itemGroup);
             }
         } catch (Exception e) {
             throw new RuntimeException("Failed to create Block: " + e.getMessage(), e);
@@ -88,6 +95,8 @@ public static Item Weapon(String weaponID, String modID, ToolMaterial material,
                 return custom1.Weapon(weaponID, modID, material, itemGroup);
             } else if (minecraftVersion.equals("1.21.2") || minecraftVersion.equals("1.21.3")) {
                 //return custom2.Weapon(weaponID, modID, material, itemGroup);
+            }else if (minecraftVersion.equals("1.20.5") || minecraftVersion.equals("1.20.6")) {
+                return custom0.Weapon(weaponID, modID, material, itemGroup);
             }
         } catch (Exception e) {
             throw new RuntimeException("Failed to create Weapon: " + e.getMessage(), e);
@@ -110,6 +119,8 @@ public static Item Armor(String armorID, String modID, RegistryEntry<ArmorMateri
                 return custom1.Armor(armorID, modID, armorType, armorPart, itemGroup);
             } else if (minecraftVersion.equals("1.21.2") || minecraftVersion.equals("1.21.3")) {
                 //return custom2.Armor(armorID, modID, armorType, armorPart, itemGroup);
+            }else if (minecraftVersion.equals("1.20.5") || minecraftVersion.equals("1.20.6")) {
+                return custom0.Armor(armorID, modID, armorType, armorPart, itemGroup);
             }
         } catch (Exception e) {
             throw new RuntimeException("Failed to create Armor: " + e.getMessage(), e);
diff --git a/src/main/java/dev/xdpxi/xdlib/api/mod/customClass/custom0.java b/src/main/java/dev/xdpxi/xdlib/api/mod/customClass/custom0.java
new file mode 100644
index 0000000..f13a0c8
--- /dev/null
+++ b/src/main/java/dev/xdpxi/xdlib/api/mod/customClass/custom0.java
@@ -0,0 +1,123 @@
+package dev.xdpxi.xdlib.api.mod.customClass;
+
+import net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroup;
+import net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents;
+import net.minecraft.block.AbstractBlock;
+import net.minecraft.block.Block;
+import net.minecraft.block.MapColor;
+import net.minecraft.item.*;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.Registry;
+import net.minecraft.registry.RegistryKey;
+import net.minecraft.registry.entry.RegistryEntry;
+import net.minecraft.text.Text;
+import net.minecraft.util.Identifier;
+
+import java.util.List;
+
+public class custom0 {
+    public static void ItemGroup(String itemGroupID, String modID, Item itemIconID, List<Item> itemsToAdd) {
+        itemGroupID = itemGroupID.toLowerCase();
+        modID = modID.toLowerCase();
+        RegistryKey<ItemGroup> ITEM_GROUP_KEY = RegistryKey.of(Registries.ITEM_GROUP.getKey(), new Identifier(modID, itemGroupID));
+
+        ItemGroup ITEM_GROUP = FabricItemGroup.builder()
+                .displayName(Text.translatable("itemGroup." + modID + "." + itemGroupID))
+                .icon(() -> new ItemStack(itemIconID != null ? itemIconID : Items.STONE))
+                .build();
+
+        Registry.register(Registries.ITEM_GROUP, ITEM_GROUP_KEY, ITEM_GROUP);
+
+        ItemGroupEvents.modifyEntriesEvent(ITEM_GROUP_KEY).register(itemGroup -> {
+            for (Item item : itemsToAdd) {
+                itemGroup.add(item);
+            }
+        });
+    }
+
+    public static void AddToItemGroup(String itemGroupID, String modID, List<Item> itemsToAdd) {
+        ItemGroup(itemGroupID, modID, null, itemsToAdd);
+    }
+
+    public static Item Item(String itemID, String modID, RegistryKey<ItemGroup> itemGroup) {
+        if (itemID == null || modID == null) {
+            throw new IllegalArgumentException("itemID or modID is null");
+        }
+        itemID = itemID.toLowerCase();
+        modID = modID.toLowerCase();
+        Identifier identifier = new Identifier(modID, itemID);
+
+        Item item = new Item(new Item.Settings());
+        Registry.register(Registries.ITEM, identifier, item);
+
+        if (itemGroup != null) {
+            ItemGroupEvents.modifyEntriesEvent(itemGroup).register(entries -> entries.add(item));
+        }
+
+        return item;
+    }
+
+    public static Item Item(String itemID, String modID) {
+        return Item(itemID, modID, null);
+    }
+
+    public static BlockItem Block(String blockID, String modID, RegistryKey<ItemGroup> itemGroup) {
+        blockID = blockID.toLowerCase();
+        modID = modID.toLowerCase();
+        Identifier blockIdentifier = new Identifier(modID, blockID);
+
+        Block block = new Block(AbstractBlock.Settings.create().mapColor(MapColor.STONE_GRAY).strength(1.5F, 6.0F));
+        Block registeredBlock = Registry.register(Registries.BLOCK, blockIdentifier, block);
+        BlockItem blockItem = new BlockItem(registeredBlock, new Item.Settings());
+
+        Registry.register(Registries.ITEM, blockIdentifier, blockItem);
+
+        if (itemGroup != null) {
+            ItemGroupEvents.modifyEntriesEvent(itemGroup).register(entries -> entries.add(blockItem));
+        }
+
+        return blockItem;
+    }
+
+    public static BlockItem Block(String blockID, String modID) {
+        return Block(blockID, modID, null);
+    }
+
+    public static Item Weapon(String weaponID, String modID, ToolMaterial material, RegistryKey<ItemGroup> itemGroup) {
+        weaponID = weaponID.toLowerCase();
+        modID = modID.toLowerCase();
+        Identifier identifier = new Identifier(modID, weaponID);
+
+        SwordItem weapon = new SwordItem(material, new Item.Settings().maxDamage(material.getDurability()));
+        Registry.register(Registries.ITEM, identifier, weapon);
+
+        if (itemGroup != null) {
+            ItemGroupEvents.modifyEntriesEvent(itemGroup).register(entries -> entries.add(weapon));
+        }
+
+        return weapon;
+    }
+
+    public static Item Weapon(String weaponID, String modID, ToolMaterial material) {
+        return Weapon(weaponID, modID, material, null);
+    }
+
+    public static Item Armor(String armorID, String modID, RegistryEntry<ArmorMaterial> armorType, ArmorItem.Type armorPart, RegistryKey<ItemGroup> itemGroup) {
+        armorID = armorID.toLowerCase();
+        modID = modID.toLowerCase();
+        Identifier identifier = new Identifier(modID, armorID);
+
+        ArmorItem armor = new ArmorItem(armorType, armorPart, new Item.Settings());
+        Registry.register(Registries.ITEM, identifier, armor);
+
+        if (itemGroup != null) {
+            ItemGroupEvents.modifyEntriesEvent(itemGroup).register(entries -> entries.add(armor));
+        }
+
+        return armor;
+    }
+
+    public static Item Armor(String armorID, String modID, RegistryEntry<ArmorMaterial> armorType, ArmorItem.Type armorPart) {
+        return Armor(armorID, modID, armorType, armorPart, null);
+    }
+}
\ No newline at end of file