diff --git a/Common/Data/Excel/AvatarConfigExcel.cs b/Common/Data/Excel/AvatarConfigExcel.cs
index 409cf11f..1e2a8604 100644
--- a/Common/Data/Excel/AvatarConfigExcel.cs
+++ b/Common/Data/Excel/AvatarConfigExcel.cs
@@ -13,6 +13,8 @@ namespace EggLink.DanhengServer.Data.Excel
         public int AvatarID { get; set; } = 0;
         public HashName AvatarName { get; set; } = new();
         public int ExpGroup { get; set; } = 0;
+        public int MaxPromotion { get; set; } = 0;
+        public int MaxRank { get; set; } = 0;
         public List<int> RankIDList { get; set; } = [];
         public string? JsonPath { get; set; } = "";
 
diff --git a/Common/Data/Excel/AvatarPromotionConfigExcel.cs b/Common/Data/Excel/AvatarPromotionConfigExcel.cs
index e5d972bf..f33c45ac 100644
--- a/Common/Data/Excel/AvatarPromotionConfigExcel.cs
+++ b/Common/Data/Excel/AvatarPromotionConfigExcel.cs
@@ -12,6 +12,9 @@ namespace EggLink.DanhengServer.Data.Excel
         public int AvatarID { get; set; }
         public int Promotion { get; set; }
         public int MaxLevel { get; set; }
+        public int PlayerLevelRequire { get; set; }
+        public int WorldLevelRequire { get; set; }
+        public List<ItemParam> PromotionCostList { get; set; } = [];
 
         public override int GetId()
         {
@@ -22,5 +25,11 @@ namespace EggLink.DanhengServer.Data.Excel
         {
             GameData.AvatarPromotionConfigData.Add(GetId(), this);
         }
+
+        public class ItemParam
+        {
+            public int ItemID;
+            public int ItemNum;
+        }
     }
 }
diff --git a/GameServer/Game/Inventory/InventoryManager.cs b/GameServer/Game/Inventory/InventoryManager.cs
index ef3b7520..8d817b57 100644
--- a/GameServer/Game/Inventory/InventoryManager.cs
+++ b/GameServer/Game/Inventory/InventoryManager.cs
@@ -1,5 +1,6 @@
 using EggLink.DanhengServer.Data;
 using EggLink.DanhengServer.Database;
+using EggLink.DanhengServer.Database.Avatar;
 using EggLink.DanhengServer.Database.Inventory;
 using EggLink.DanhengServer.Enums.Item;
 using EggLink.DanhengServer.Game.Player;
@@ -758,6 +759,32 @@ namespace EggLink.DanhengServer.Game.Inventory
             return list;
         }
 
+        public Boolean promoteAvatar(int avatarId) {
+            // Get avatar
+            AvatarInfo avatarData = Player.AvatarManager!.GetAvatar(avatarId)!;
+            if (avatarData == null || avatarData.Excel == null || avatarData.Promotion >= avatarData.Excel.MaxPromotion) return false;
+            
+            // Get promotion data
+            Data.Excel.AvatarPromotionConfigExcel promotion = GameData.AvatarPromotionConfigData.Values.FirstOrDefault(x => x.AvatarID == avatarId && x.Promotion == avatarData.Promotion + 1)!;
+
+            // Sanity check
+            if ((promotion == null) || avatarData.Level < promotion.MaxLevel || Player.Data.Level < promotion.PlayerLevelRequire || Player.Data.WorldLevel < promotion.WorldLevelRequire) {
+                return false;
+            }
+
+            // Pay items
+            foreach (var cost in promotion.PromotionCostList) {
+                Player.InventoryManager!.RemoveItem(cost.ItemID, cost.ItemNum);
+            }
+
+            // Promote
+            avatarData.Promotion = avatarData.Promotion + 1;
+
+            // Send packets
+            Player.SendPacket(new PacketPlayerSyncScNotify(avatarData));
+            return true;
+        }
+
         public List<ItemData> LevelUpRelic(int uniqueId, ItemCostData costData)
         {
             var relicItem = Data.RelicItems.Find(x => x.UniqueId == uniqueId);
diff --git a/GameServer/Server/Packet/Recv/Avatar/HandlerPromoteAvatarCsReq.cs b/GameServer/Server/Packet/Recv/Avatar/HandlerPromoteAvatarCsReq.cs
new file mode 100644
index 00000000..eeffb00b
--- /dev/null
+++ b/GameServer/Server/Packet/Recv/Avatar/HandlerPromoteAvatarCsReq.cs
@@ -0,0 +1,22 @@
+using EggLink.DanhengServer.Proto;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EggLink.DanhengServer.Server.Packet.Recv.Avatar
+{
+    [Opcode(CmdIds.PromoteAvatarCsReq)]
+    public class HandlerPromoteAvatarCsReq : Handler
+    {
+        public override void OnHandle(Connection connection, byte[] header, byte[] data)
+        {
+            var req = PromoteAvatarCsReq.Parser.ParseFrom(data);
+
+            connection.Player!.InventoryManager!.promoteAvatar((int)req.BaseAvatarId);
+
+            connection.SendPacket(CmdIds.PromoteAvatarScRsp);
+        }
+    }
+}