diff --git a/prefab/weapons/staffOfTheUndead.tscn b/prefab/weapons/staffOfTheUndead.tscn
index 54bad3f..9faac93 100644
--- a/prefab/weapons/staffOfTheUndead.tscn
+++ b/prefab/weapons/staffOfTheUndead.tscn
@@ -1,7 +1,7 @@
 [gd_scene load_steps=6 format=3 uid="uid://dnnn2xyayiehk"]
 
 [ext_resource type="Texture2D" uid="uid://e6670ykyq145" path="res://sprites/weapon/staffOfTheUndead.png" id="1_ms3us"]
-[ext_resource type="Script" path="res://scripts/weapon/ProjectileWeapon.cs" id="1_w8hhv"]
+[ext_resource type="Script" path="res://scripts/item/weapon/ProjectileWeapon.cs" id="1_w8hhv"]
 [ext_resource type="Texture2D" uid="uid://b2blj0yf4ohx3" path="res://icon.svg" id="2_l5lni"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_obcq2"]
@@ -14,6 +14,7 @@ size = Vector2(49, 5.25)
 collision_layer = 8
 collision_mask = 34
 script = ExtResource("1_w8hhv")
+Id = "staff_of_the_undead"
 metadata/Projectiles = PackedStringArray("res://prefab/projectile/curseOfTheUndead.tscn")
 metadata/Name = "staff_of_the_undead"
 metadata/FiringIntervalArray = PackedInt64Array(5000, 500, 250)
diff --git a/scripts/character/CharacterTemplate.cs b/scripts/character/CharacterTemplate.cs
index e483543..5aa1650 100644
--- a/scripts/character/CharacterTemplate.cs
+++ b/scripts/character/CharacterTemplate.cs
@@ -7,6 +7,7 @@ using ColdMint.scripts.damage;
 using ColdMint.scripts.debug;
 using ColdMint.scripts.health;
 using ColdMint.scripts.inventory;
+using ColdMint.scripts.item;
 using ColdMint.scripts.utils;
 using ColdMint.scripts.item.weapon;
 
@@ -352,9 +353,9 @@ public partial class CharacterTemplate : CharacterBody2D
             return false;
         }
 
-        if (_currentItem is WeaponTemplate weaponTemplate)
+        if (_currentItem is IItem_New item)
         {
-            weaponTemplate.Fire(this, position);
+            item.Use(this, position);
         }
 
         return true;
diff --git a/scripts/item/IItemStack.cs b/scripts/item/IItemStack.cs
index cb4d467..f476c63 100644
--- a/scripts/item/IItemStack.cs
+++ b/scripts/item/IItemStack.cs
@@ -40,12 +40,10 @@ public interface IItemStack
     /// <summary>
     /// Create a new ItemStack with the given item as the first item
     /// </summary>
-    public static IItemStack? FromItem(IItem_New item) => ItemTypeManager.StackTypeOf(item.Id) switch
+    public static IItemStack FromItem(IItem_New item) => ItemTypeManager.MaxStackQuantityOf(item.Id) switch
     {
-        StackType.Common      => throw new NotImplementedException(),
-        StackType.Unique      => throw new NotImplementedException(),
-        StackType.Unstackable => new SingleItemStack(item),
-        null                  => null,
-        _                     => throw new ArgumentException()
+        1         => new SingleItemStack(item),
+        > 1       => throw new NotImplementedException(),
+        var other => throw new ArgumentException($"item {item} of type '{item.Id}' has unexpected max stack quantity {other}")
     };
 }
\ No newline at end of file
diff --git a/scripts/item/IItem_New.cs b/scripts/item/IItem_New.cs
index 520a995..d98e25d 100644
--- a/scripts/item/IItem_New.cs
+++ b/scripts/item/IItem_New.cs
@@ -21,4 +21,11 @@ public interface IItem_New
     /// <para>Description of current item, which may show in inventory</para>
     /// </summary>
     string? Description { get; }
+
+    /// <summary>
+    /// <para>Execute when current item is used <br/> e.g. when player clicks left mouse button with current item in hand</para>
+    /// </summary>
+    /// <param name="owner">Owner of current item, if any</param>
+    /// <param name="targetGlobalPosition">Target position, such as the position of the cursor when used by the player</param>
+    void Use(Node2D? owner, Vector2 targetGlobalPosition);
 }
\ No newline at end of file
diff --git a/scripts/item/ItemType.cs b/scripts/item/ItemType.cs
index 1174596..308370b 100644
--- a/scripts/item/ItemType.cs
+++ b/scripts/item/ItemType.cs
@@ -22,8 +22,4 @@ public readonly struct ItemType
     /// <para>Max number in item stack of this type</para>
     /// </summary>
     public int MaxStackQuantity { get; init; }
-    /// <summary>
-    /// <para>Determines how items of this type will be stacked</para>
-    /// </summary>
-    public StackType StackType { get; init; }
 }
\ No newline at end of file
diff --git a/scripts/item/ItemTypeManager.cs b/scripts/item/ItemTypeManager.cs
index f7f1bce..b8e82ea 100644
--- a/scripts/item/ItemTypeManager.cs
+++ b/scripts/item/ItemTypeManager.cs
@@ -58,5 +58,4 @@ public static class ItemTypeManager
             : DefaultTexture;
 
     public static int MaxStackQuantityOf(string id) => Registry.TryGetValue(id, out var itemType) ? itemType.MaxStackQuantity : 0;
-    public static StackType? StackTypeOf(string id) => Registry.TryGetValue(id, out var itemType) ? itemType.StackType : null;
 }
\ No newline at end of file
diff --git a/scripts/item/StackType.cs b/scripts/item/StackType.cs
deleted file mode 100644
index 85998ba..0000000
--- a/scripts/item/StackType.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-namespace ColdMint.scripts.item;
-
-public enum StackType
-{
-    Common,
-    Unique,
-    Unstackable,
-}
\ No newline at end of file
diff --git a/scripts/item/weapon/WeaponTemplate.cs b/scripts/item/weapon/WeaponTemplate.cs
index bf4611f..cd029a3 100644
--- a/scripts/item/weapon/WeaponTemplate.cs
+++ b/scripts/item/weapon/WeaponTemplate.cs
@@ -13,18 +13,27 @@ namespace ColdMint.scripts.item.weapon;
 /// <para>WeaponTemplate</para>
 /// <para>武器模板</para>
 /// </summary>
-public partial class WeaponTemplate : RigidBody2D, IItem
+public abstract partial class WeaponTemplate : RigidBody2D, IItem_New
 {
     private float _gravity = ProjectSettings.GetSetting("physics/2d/default_gravity").AsSingle();
 
-    public string? Id { get; set; }
-    public int Quantity { get; set; }
-    public int MaxStackQuantity { get; set; }
-    public Texture2D? Icon { get; set; }
-    public new string? Name { get; set; }
-    public string? Description { get; set; }
-    public Action<IItem>? OnUse { get; set; }
-    public Func<IItem, Node>? OnInstantiation { get; set; }
+    //Implements IItem
+    [Export] public virtual string Id { get; private set; } = "ID";
+
+    protected virtual Texture2D? UniqueIcon { get; set; }
+    public Texture2D Icon => UniqueIcon ?? ItemTypeManager.DefaultIconOf(Id);
+
+    protected string? UniqueName { get; set; }
+    public new string Name => UniqueName ?? ItemTypeManager.DefaultNameOf(Id);
+
+    protected string? UniqueDescription { get; set; }
+    public string? Description => UniqueDescription ?? ItemTypeManager.DefaultDescriptionOf(Id);
+
+
+    public void Use(Node2D? owner, Vector2 targetGlobalPosition)
+    {
+        Fire(owner, targetGlobalPosition);
+    }
 
     /// <summary>
     /// <para>Owner</para>
@@ -39,8 +48,8 @@ public partial class WeaponTemplate : RigidBody2D, IItem
     /// </summary>
     public bool EnableContactInjury;
 
-    private int _minContactInjury;
-    private int _maxContactInjury;
+    [Export] private int _minContactInjury = 1;
+    [Export] private int _maxContactInjury = 2;
 
     private DateTime? _lastFiringTime;
 
@@ -49,6 +58,7 @@ public partial class WeaponTemplate : RigidBody2D, IItem
     /// <para>开火间隔</para>
     /// </summary>
     private TimeSpan _firingInterval;
+    [Export] private long _firingIntervalAsMillisecond = 100;
 
 
     /// <summary>
@@ -59,7 +69,7 @@ public partial class WeaponTemplate : RigidBody2D, IItem
     ///<para>When the weapon is fired, how much recoil is applied to the user, in units: the number of cells, and the X direction of the force is automatically inferred.</para>
     ///<para>武器开火，要对使用者施加多大的后坐力，单位：格数，力的X方向是自动推断的。</para>
     /// </remarks>
-    private Vector2 _recoil;
+    [Export] private Vector2 _recoil;
 
     /// <summary>
     /// <para>This area represents the collision range of the weapon, and when other nodes enter this area, they will deal damage.</para>
@@ -75,16 +85,18 @@ public partial class WeaponTemplate : RigidBody2D, IItem
         RayCast2D = GetNode<RayCast2D>("RayCast2D");
         _area2D = GetNode<Area2D>("Area2D");
         _area2D.BodyEntered += OnBodyEnter;
-        Id = GetMeta("ID", "1").AsString();
-        Quantity = GetMeta("Quantity", "1").AsInt32();
-        MaxStackQuantity = GetMeta("MaxStackQuantity", Config.MaxStackQuantity).AsInt32();
-        Icon = GetMeta("Icon", "").As<Texture2D>();
-        Name = GetMeta("Name", "").AsString();
-        Description = GetMeta("Description", "").AsString();
-        _firingInterval = TimeSpan.FromMilliseconds(GetMeta("FiringInterval", "100").AsInt64());
-        _minContactInjury = GetMeta("MinContactInjury", "1").AsInt32();
-        _maxContactInjury = GetMeta("MaxContactInjury", "2").AsInt32();
-        _recoil = GetMeta("Recoil", Vector2.Zero).AsVector2();
+        // Id = GetMeta("ID",                             "1").AsString();
+        // Quantity = GetMeta("Quantity",                 "1").AsInt32();
+        // MaxStackQuantity = GetMeta("MaxStackQuantity", Config.MaxStackQuantity).AsInt32();
+        // Icon = GetMeta("Icon",                         "").As<Texture2D>();
+        // Name = GetMeta("Name",                         "").AsString();
+        // Description = GetMeta("Description",           "").AsString();
+        // _firingInterval = TimeSpan.FromMilliseconds(GetMeta("FiringInterval", "100").AsInt64());
+        // _minContactInjury = GetMeta("MinContactInjury", "1").AsInt32();
+        // _maxContactInjury = GetMeta("MaxContactInjury", "2").AsInt32();
+        // _recoil = GetMeta("Recoil",                     Vector2.Zero).AsVector2();
+
+        _firingInterval = TimeSpan.FromMilliseconds(_firingIntervalAsMillisecond);
     }
 
 
@@ -118,7 +130,7 @@ public partial class WeaponTemplate : RigidBody2D, IItem
         //Determine if your side can cause damage
         //判断所属的阵营是否可以造成伤害
         var canCauseHarm = CampManager.CanCauseHarm(CampManager.GetCamp(ownerCharacterTemplate.CampId),
-            CampManager.GetCamp(characterTemplate.CampId));
+                                                    CampManager.GetCamp(characterTemplate.CampId));
         if (!canCauseHarm)
         {
             return;
@@ -145,9 +157,7 @@ public partial class WeaponTemplate : RigidBody2D, IItem
     /// <para>翻转武器</para>
     /// </summary>
     /// <param name="facingLeft"></param>
-    public void Flip(bool facingLeft)
-    {
-    }
+    public void Flip(bool facingLeft) { }
 
     public override void _PhysicsProcess(double delta)
     {
@@ -224,7 +234,5 @@ public partial class WeaponTemplate : RigidBody2D, IItem
     /// <para>Execute fire</para>
     /// <para>执行开火</para>
     /// </summary>
-    protected virtual void DoFire(Node2D? owner, Vector2 enemyGlobalPosition)
-    {
-    }
+    protected abstract void DoFire(Node2D? owner, Vector2 enemyGlobalPosition);
 }
\ No newline at end of file