eldritch leach

with an arch of eldritch energy you reach out to strike the target  make a ranged spell attack. On a hit, the target takes 4d6 necrotic damage. and you regain this amount of damage to your hit points  

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 2nd .