Corpse Explosion

The user channels necromantic energies into a corpse that is medium size, and is comprised of some form of flesh or organic material (refer to DM for verification on valid targets). These energies cause the internal composition of the corpse to become volatile and quickly increase the rate of decay until a burst of bone, flesh, and blood occurs, dealing 3d6 necrotic damage and 3d6 bludgeoning damage to every creature within a 15 ft sphere. of the corpse.

Corpse Explosion can target a creature of Large and Huge at 6th and 9th level, respectively, and covers an additional 15 ft. per size criteria.  Additionally, for every level above 3rd level, Corpse Explosion deals an additional 1d6 Bludgeoning and 1d6 Necrotic.