Corpse Bomb

A corpse of your choice bubbles and pulses with unholy life skin and bone expanding until it bursts in a gory bomb of bone fragments. Each creature in a 15-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 piercing 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 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.