Vampiric blast

A blast of necrotic energy bursts from your hand and moves a part of the targets life-force unto yourself. On a hit, the target takes 3d8 necrotic damage, and you regain hit points equal to the amount of damage dealt. 

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