Corpse Bomb

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. Undead count as recently dead once their HP reach 0 again. Each creature within a 5-foot-radius sphere centered on that corpse must make a Dexterity saving throw. A target takes 1d8 necrotic damage on a failed save, or half as much damage on a successful one. The size of the explosion increases by 5 feet for every size larger than small.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.