Double Pain

Your touch amplifies pain twofold. Make a melee spell attack against the target. If you hit, the target must succeed on a Wisdom saving throw the next time they take damage before the end of your next turn. If they fail, they take psychic damage equal to the damage they just took. If they succeed, they take psychic damage equal to half the damage they just took. If this psychic damage reduces them to zero hit points, they fall unconscious, but are stable.

A target is unaffected if it is immune to being charmed.