Corpse Bomb

You target the corpse of a creature that's been dead for no longer than 24 hours that you can see within range, detonating it. Each creature within a 5-foot-radius sphere centered on that corpse must make a DC 13 Dexterity saving throw. On a failed save, a target takes 1d8 necrotic damage and is knocked prone, or half as much damage on a successful one and not knocked prone. The size of the explosion increases by 5 feet and the damage increases by 1d8 for every size larger than medium.

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.