Bone Repair

You reach out and touch an undead creature giving it a surge of your life force. An undead creature you touch regains a number of hit points equal to 1d8 + your spell casting ability modifier. The caster of this spell takes 1 necrotic damage

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the healing increases by 1d8 and the necrotic damage increases by 1 for each slot level above 1st.