Bastion's corpse explosion

You target a willing undead creature or a corpse of any creature that isn't a construct and cause it to explode in a vast of acids. each creature within 15 feet of the corpse or undead must make a Dexterity saving throw. Taking 2d8 acid damage on a failed save or half as much on a successful one. The corpse or creature is completely destroyed when it explodes. Leaving few remains