diff --git a/Common/Data/Excel/BreakExcel.cs b/Common/Data/Excel/BreakExcel.cs
new file mode 100644
index 0000000..5abd201
--- /dev/null
+++ b/Common/Data/Excel/BreakExcel.cs
@@ -0,0 +1,34 @@
+using Newtonsoft.Json;
+
+namespace MikuSB.Data.Excel;
+
+[ResourceEntity("break.json")]
+public class BreakExcel : ExcelResource
+{
+    [JsonProperty("ID")] public int Id { get; set; }
+
+    [JsonProperty("Items1")] public List<List<int>> Items1 { get; set; } = [];
+    [JsonProperty("Items2")] public List<List<int>> Items2 { get; set; } = [];
+    [JsonProperty("Items3")] public List<List<int>> Items3 { get; set; } = [];
+    [JsonProperty("Items4")] public List<List<int>> Items4 { get; set; } = [];
+    [JsonProperty("Items5")] public List<List<int>> Items5 { get; set; } = [];
+    [JsonProperty("Items6")] public List<List<int>> Items6 { get; set; } = [];
+
+    public List<List<int>> GetItems(uint breakLevel) => breakLevel switch
+    {
+        1 => Items1,
+        2 => Items2,
+        3 => Items3,
+        4 => Items4,
+        5 => Items5,
+        6 => Items6,
+        _ => []
+    };
+
+    public override uint GetId() => (uint)Id;
+
+    public override void Loaded()
+    {
+        GameData.BreakData[Id] = this;
+    }
+}
diff --git a/Common/Data/GameData.cs b/Common/Data/GameData.cs
index fabd1fe..80d94b3 100644
--- a/Common/Data/GameData.cs
+++ b/Common/Data/GameData.cs
@@ -16,6 +16,7 @@ public static class GameData
     public static Dictionary<uint, ArItemExcel> ArItemData { get; private set; } = [];
     public static Dictionary<uint, ManifestationExcel> ManifestationData { get; private set; } = [];
     public static Dictionary<uint, Rogue3DDifficultExcel> Rogue3DDifficultData { get; private set; } = [];
+    public static Dictionary<int, BreakExcel> BreakData { get; private set; } = [];
     public static Dictionary<uint, SpineExcel> SpineData { get; private set; } = [];
     public static Dictionary<uint, NodeConditionExcel> NodeConditionData { get; private set; } = [];
     public static List<SupportCardExcel> SupportCardData { get; private set; } = [];
diff --git a/GameServer/Server/CallGS/Handlers/Weapon/Weapon_Break.cs b/GameServer/Server/CallGS/Handlers/Weapon/Weapon_Break.cs
new file mode 100644
index 0000000..96c2996
--- /dev/null
+++ b/GameServer/Server/CallGS/Handlers/Weapon/Weapon_Break.cs
@@ -0,0 +1,98 @@
+using MikuSB.Data;
+using MikuSB.Database;
+using MikuSB.Proto;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.Weapon;
+
+// s2c: function(sErr) — send "null" on success (json.decode("null") = nil = falsy in Lua)
+[CallGSApi("Weapon_Break")]
+public class Weapon_Break : ICallGSHandler
+{
+    private const uint MaxBreak = 6;
+
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var player = connection.Player!;
+        var req = JsonSerializer.Deserialize<WeaponBreakParam>(param);
+        if (req == null || req.WeaponId == 0)
+        {
+            await CallGSRouter.SendScript(connection, "Weapon_Break", "\"error.BadParam\"");
+            return;
+        }
+
+        var weapon = player.InventoryManager.InventoryData.Weapons.GetValueOrDefault((uint)req.WeaponId);
+        if (weapon == null)
+        {
+            await CallGSRouter.SendScript(connection, "Weapon_Break", "\"error.BadParam\"");
+            return;
+        }
+
+        if (weapon.Break >= MaxBreak)
+        {
+            await CallGSRouter.SendScript(connection, "Weapon_Break", "\"tip.already_max_break\"");
+            return;
+        }
+
+        var nextBreak = weapon.Break + 1;
+
+        // Look up break cost from WeaponExcel → BreakExcel
+        var weaponExcel = GameData.WeaponData.Values.FirstOrDefault(x =>
+            GameResourceTemplateId.FromGdpl(x.Genre, x.Detail, x.Particular, x.Level) == weapon.TemplateId);
+
+        var requestedMaterials = new Dictionary<ulong, uint>();
+        if (weaponExcel != null && GameData.BreakData.TryGetValue(weaponExcel.BreakMatID, out var breakExcel))
+        {
+            foreach (var row in breakExcel.GetItems(nextBreak))
+            {
+                if (row.Count < 5) continue;
+                var tid = GameResourceTemplateId.FromGdpl(
+                    (uint)row[0], (uint)row[1], (uint)row[2], (uint)row[3]);
+                requestedMaterials[tid] = requestedMaterials.GetValueOrDefault(tid) + (uint)row[4];
+            }
+        }
+
+        // Validate materials
+        foreach (var (tid, count) in requestedMaterials)
+        {
+            var item = player.InventoryManager.InventoryData.Items.Values.FirstOrDefault(x => x.TemplateId == tid);
+            if (item == null || item.ItemCount < count)
+            {
+                await CallGSRouter.SendScript(connection, "Weapon_Break", "\"tip.not_material_for_break\"");
+                return;
+            }
+        }
+
+        // Consume materials
+        var syncItems = new List<Item>();
+        foreach (var (tid, count) in requestedMaterials)
+        {
+            var item = player.InventoryManager.InventoryData.Items.Values.First(x => x.TemplateId == tid);
+            item.ItemCount -= count;
+            var proto = item.ToProto();
+            if (item.ItemCount == 0)
+            {
+                player.InventoryManager.InventoryData.Items.Remove(item.UniqueId);
+                proto.Count = 0;
+            }
+            syncItems.Add(proto);
+        }
+
+        weapon.Break = nextBreak;
+        syncItems.Add(weapon.ToProto());
+
+        DatabaseHelper.SaveDatabaseType(player.InventoryManager.InventoryData);
+
+        var sync = new NtfSyncPlayer();
+        sync.Items.AddRange(syncItems);
+
+        await CallGSRouter.SendScript(connection, "Weapon_Break", "null", sync);
+    }
+}
+
+internal sealed class WeaponBreakParam
+{
+    [JsonPropertyName("Id")]
+    public int WeaponId { get; set; }
+}