A sphere of necrotic energy drains the life force of creatures in a 60-foot- radius sphere from a point within range. Each creature in that area must succeed on a Constitution saving throw or take 10d6 necrotic damage, and you regain hit points equal to half the amount of necrotic damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d6 for each slot level above 6th.