Corpse Bomb

The corpse of a deceased creature rapidly bloats at your command and erupts in a gruesome explosion. You target the corpse of a creature 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 2d10 necrotic damage on a failed save, or half as much damage on a successful one. 

At Higher Levels. The size of the explosion increases to a 10-foot-radius at level 5, a 15-foot-radius at level 11, and a 20-foot-radius at level 17.