Curse of Self Destruction

Your shadow fosters in the delight of harm to all -- including yourself.

Equal Destruction. Whenever you roll a natural one on an attack roll, you instead make the attack against yourself as the shadow strikes you using your own movement. The attack automatically hits you. And the action, bonus action, or reaction make on the attack is wasted. If you have a feature that allows you to make multiple attacks, like the fighter extra attack feature, only one attack is wasted instead.