Corpse Explosion

Choose the corpse of a creature that is Large or smaller that you can see within 60 feet of you. The bodily fluids and components of that corpse expand and explode fiercely, dealing damage based on the size of the creature in a certain radius. Each creature in the area must make a dexterity saving throw, taking full damage on a failed save, or half damage on a successful save.

Tiny: 4d4 fire damage in a 5-foot radius sphere.

Small: 3d6 fire damage in a 10-foot radius sphere.

Medium: 3d8 fire damage in a 15-foot radius sphere.

Large: 3d10 fire damage in a 20-foot radius sphere.

This spell does not affect constructs. If used on an undead creature, it deals damage directly to the creature, and if the creature is reduced to 0 hit points, it explodes, dealing one additional die of damage. If targeted, any undead controlled by the caster explodes immediately, regardless of hit points. Once a corpse explodes it may not be selected again as a valid target for this spell.

At Higher Levels: When you cast this spell at 3rd level or higher, increase the damage dealt by the explosion by 1 die of the appropriate type, and increase the number of corpses you can make explode by 1 for every two levels. Damage from separate explosions DO overlap. At 5th level, you may use huge-sized corpses. At 7th level, you may use gargantuan-sized corpses. The damage below reflects the damage dealt at 5th and 7th level, respectively.

Huge: 6d12 fire damage in a 30-foot radius sphere. 2 corpses.

Gargantuan: 7d20 fire damage in a 50-foot radius sphere. 3 corpses.