Add an effect that shows the item you're using to attack with when attacking

Content.Shared/GameObjects/EntitySystemMessages/MeleeWeaponSystemMessages.cs

@@ -11,18 +11,22 @@ namespace Content.Shared.GameObjects.EntitySystemMessages
         [Serializable, NetSerializable]
         public sealed class PlayMeleeWeaponAnimationMessage : EntitySystemMessage
         {
-            public PlayMeleeWeaponAnimationMessage(string arcPrototype, Angle angle, EntityUid attacker, List<EntityUid> hits)
+            public PlayMeleeWeaponAnimationMessage(string arcPrototype, Angle angle, EntityUid attacker, EntityUid source, List<EntityUid> hits, bool textureEffect = false)
             {
                 ArcPrototype = arcPrototype;
                 Angle = angle;
                 Attacker = attacker;
+                Source = source;
                 Hits = hits;
+                TextureEffect = textureEffect;
             }
 
             public string ArcPrototype { get; }
             public Angle Angle { get; }
             public EntityUid Attacker { get; }
+            public EntityUid Source { get; }
             public List<EntityUid> Hits { get; }
+            public bool TextureEffect { get; }
         }
     }
 }

Content.Shared/Interfaces/GameObjects/Components/Interaction/IAttack.cs

@@ -32,6 +32,6 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         public GridCoordinates ClickLocation { get; }
         public bool WideAttack { get; }
         public EntityUid Target { get; }
-        public IEntity? TargetEntity => IoCManager.Resolve<IEntityManager>()?.GetEntity(Target) ?? null;
+        public IEntity? TargetEntity => Target.IsValid() ? IoCManager.Resolve<IEntityManager>()?.GetEntity(Target) ?? null : null;
     }
 }