Corpse Fade (HFO)

You cause the corpses of all beasts, giants, humanoids, dragons, and monstrosities in a 30-foot cube centered on a point you choose within range to gradually fade to dust. To qualify, a corpse must have at least three-fourths of its body within the cube, though the age of the body does not matter. The cube extends around corners, but can be blocked by ten feet of earth, and also will not affect any corpse surrounded or enclosed by still-living organic material.