Vampiric Blast

A sphere of dark energy radiates from you with a 20-foot radius. Each creature in a 20-foot-radius sphere centered on you must make a Dexterity saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.

The energy spreads around corners, and any allies within the sphere, including you, regain hit points equal to half the amount of necrotic damage rolled. 

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 3rd.