SRD

Circle of Death

6-level Necromancy

A sphere of negative energy ripples out in a 60-foot-radius sphere from a point within range. Each creature in that area must make a Constitution saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.
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. 7th level 10d6 , 8th level 12d6 , 9th level 14d6 .