Blood Sacrifice

A creature you touch regains a number of hit points equal to 1d8 + your spellcasting ability modifier. This Only affects Vampiric creatures and undead. You must either damage yourself for 1d6 points of necrotic damage which cannot be reduced or use a small vial of blood.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the healing increases by 1d8 for each slot level above 1st. The damage also increases by 1d6 and the amount of blood vials used as a substitute go up by one.