Blood Siphon

Drain the life energy of the target to fuel your own regeneration. Make a ranged spell attack against the target. On a hit, the target takes 2d8 necrotic damage and you regain hit points equal to half the necrotic damage the target took.

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