Decompose Corpse

Using this spell, the caster rapidly decomposes the flesh from a single corpse of size Huge or smaller, leaving behind a perfectly cleaned skeleton. This spell has no effect on a living creature, however if cast on a non-skeletal corporeal undead, it must make a Constitution saving throw. If failed, the creature has disadvantage on all rolls and -2 to its Armor Class.

The effects of this spell can be reversed by the spell restore corpse. They also can be removed with a create undead spell, which binds undead flesh back onto the creature’s bones. When cast in this way, create undead does not require onyx stones as a material component.