Transfusion

You extract the exposed blood of a weakened enemy and use it to revitalize yourself. Target one creature of your choice that is within range and is currently below its maximum hit points or has died within the last hour. The target takes 1 necrotic damage and you regain hit points equal to 1d6+1.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the Healing increases by 1d6+1 for each slot level above 1st and damage to target increases by 1 necrotic damage per spell slot above 1st.