Assassins Blade

You create a weapon in your hand and appears to be whatever melee weapon you wish it to be. You are proficient with this weapon while concentrating on this spell. When using this weapon you make a melee spell attack. On a hit the target takes 4d6 damage of the weapons type. This damage cannot be resisted in any way. The weapon disappears if it leaves your hand and the spell ends.

If a target is killed by this weapon the weapon disappears, the spell ends and all the targets wounds close up and all evidence of combat such as blood or guts disappear and it will appear that the target died from a non combat cause. A detect magic on the body will not reveal how they died