Transfusion

You pick a target and an ally that are both within 60 feet of you. the target makes a con save on amd on a failure it takes 4d4 + casting mod necrotic damage and your ally heals by X2 the amount or you by a 1:1 ratio. However on a successful CON save they take half damage and no one heals. At player level 6 it will change to a d6, at level 9 it will change to a d8, at 12 you add an extra die, and every three levels after you add an extra die as well.