You envelop an area with necrotic energy, draining the creatures within. Choose an area within a sphere with a diameter of 20 feet within 60 feet of you. All creatures within that area must make a Constitution saving throw. A creature takes 3d6 necrotic damage on a failed save, and you regain hit points equal to half the amount of necrotic damage dealt to each creature.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.