Blood Letting

You choose a creature within range that has blood. The target must make a Constitution saving throw. On a failed save, the creature takes 8d8 necrotic damage, and you regain hit points equal to the damage dealt. If the target has no blood or is an undead or construct, it is immune to this spell.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the necrotic damage increases by 1d8 for each slot level above 5th.