Draining Implosion

Each creature in a 15-foot-radius sphere centered on that point must make a Constitution saving throw. A target takes 3d12 necrotic damage on a failed save, or half as much damage on a successful one. You regain hit points equal to the damage + your Constitution modifier.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.