Deadly Corpses

The corpse of a recently deceased creature rapidly bloats at your command and erupts in a gruesome explosion.
You target the corpse of a creature that's been dead for no longer than 1 minute that you can see within range, detonating it. Each creature within a 5-foot-radius sphere centered on that corpse must make a Dexterity saving throw. A target takes 2d8 necrotic damage on a failed save, or half as much damage on a successful one. The size of the explosion increases by a 5-foot radius for every size larger than medium of the corpse that you target.