diff --git a/Assets/Mods/Basic/Cards/Scripts/Assassin/Backstab.cs b/Assets/Mods/Basic/Cards/Scripts/Assassin/Backstab.cs
index fdd8d1e2..c9981f9a 100644
--- a/Assets/Mods/Basic/Cards/Scripts/Assassin/Backstab.cs
+++ b/Assets/Mods/Basic/Cards/Scripts/Assassin/Backstab.cs
@@ -1,5 +1,6 @@
 using Continentis.MainGame.Card;
 using Continentis.MainGame.Character;
+using Continentis.MainGame.Commands;
 using SLSFramework.General;
 using System.Collections.Generic;
 
@@ -7,9 +8,28 @@ namespace Continentis.Mods.Basic.Cards
 {
     public class Backstab : CardLogicBase
     {
+        private int _sharpnessCount = 0;
         protected override List<CommandBase> PlayEffect(List<CharacterBase> targetList)
         {
-            return base.PlayEffect(targetList);
+            CommandGroup mainGroup = TargetListCommandGroup( targetList,
+                new Cmd_PlayAnimation(user.characterView, "Attack"),
+                new Cmd_PlaySFX("SFX_Basic_SwordStrike"),
+                new Cmd_SpawnVFX("VFX_Basic_RedImpact"),
+                new Cmd_ParamFunction<CharacterBase>(target =>
+                {
+                    _sharpnessCount = 0;
+                    if (user.combatBuffSubmodule.HasBuff<Buffs.Sharpness>())
+                    {
+                        _sharpnessCount = user.combatBuffSubmodule.GetBuff<Buffs.Sharpness>().unitedStackSubmodule.stackAmount;
+                    }
+                    user.Attack(target, GetFinalDamage(target));
+                }),
+                new Cmd_ParamFunction<CharacterBase>(target =>
+                {
+                    CreateCharacterBuff<Buffs.Sharpness>(_sharpnessCount).Apply(user, user, this);
+                }));
+
+            return new List<CommandBase> { mainGroup };
         }
     }
 }
diff --git a/Assets/Mods/Basic/Cards/Scripts/Assassin/ExtremePain.cs b/Assets/Mods/Basic/Cards/Scripts/Assassin/ExtremePain.cs
index d1c04769..da7cabed 100644
--- a/Assets/Mods/Basic/Cards/Scripts/Assassin/ExtremePain.cs
+++ b/Assets/Mods/Basic/Cards/Scripts/Assassin/ExtremePain.cs
@@ -16,11 +16,6 @@ namespace Continentis.Mods.Basic.Cards
                 new Cmd_SpawnVFX("VFX_Basic_RedImpact"),
                 new Cmd_ParamFunction<CharacterBase>(target =>
                 {
-                    var extraDamage = 0;
-                    if (target.combatBuffSubmodule.HasBuff<Buffs.Corrosion>())
-                    {
-                        extraDamage = target.combatBuffSubmodule.GetBuff<Buffs.Corrosion>().unitedStackSubmodule.stackAmount;
-                    }
                     user.Attack(target, GetFinalDamage(target));
                 }));
 
diff --git a/Assets/Mods/Basic/Localization/Localization_Basic_AssassinCards.csv b/Assets/Mods/Basic/Localization/Localization_Basic_AssassinCards.csv
index 79ab19b2..8b805aa4 100644
--- a/Assets/Mods/Basic/Localization/Localization_Basic_AssassinCards.csv
+++ b/Assets/Mods/Basic/Localization/Localization_Basic_AssassinCards.csv
@@ -17,7 +17,7 @@ Card_Basic_BladeOfFear_DisplayName,Blade of Fear,怖刃,,,,,
 Card_Basic_BladeOfFear_FunctionText,Test Description,造成$Attribute("Damage")点伤害。\n获得$Attribute("BuffStack")层$Keyword("Basic_Sharpness")。,,,,,
 Card_Basic_AmbushStance_DisplayName,Ambush Stance,伺机待发,,,,,
 Card_Basic_AmbushStance_FunctionText,Test Description,每当你打出一张牌，获得$Attribute("BuffStack")层$Keyword("Basic_Sharpness")。,,,,,
-Card_Basic_Backstab_DisplayName,Backstab,背刺（TODO）,,,,,
-Card_Basic_Backstab_FunctionText,Test Description,TODO,,,,,
+Card_Basic_Backstab_DisplayName,Backstab,背刺,,,,,
+Card_Basic_Backstab_FunctionText,Test Description,造成$Attribute("Damage")点伤害。\n返还这张牌使用的$Keyword("Basic_Sharpness")层数。,,,,,
 Card_Basic_FlashTerror_DisplayName,FlashTerror,快速威吓（TODO）,,,,,
 Card_Basic_FlashTerror_FunctionText,Test Description,TODO,,,,,
diff --git a/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png b/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png
index 33e3c855..1b9c1d27 100644
Binary files a/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png and b/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png differ
diff --git a/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png.meta b/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png.meta
index 7bb07e0c..df1542c8 100644
--- a/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png.meta
+++ b/Assets/Mods/Basic/Sprites/Buffs/BuffIcon_Basic_Sharpness.png.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 3c126886acf6535418c51c5e2c67347a
+guid: 7e7ad12f4b02f7e419cff05235ea8fe6
 labels:
 - UnityAI
 TextureImporter: