3-level Necromancy
You attempt to siphon life force from a sentient creature to slightly heal your wounds. Make a melee spell attack against a creature within your reach. On a hit, the target takes 6d4 psychic damage, and the target of this spell must succeed on an Intelligence saving throw. On a failed save, you regain hit points equal to one-quarter the amount of psychic damage dealt, rounded up.
When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d4 for each slot level above 3rd.