Necrotic energy shoots out of your hands instantly killing large amounts of the target's body tissue leaving the victim's skin as black leathery wounds. The target must make a Constitution saving throw. The target takes 15d8 necrotic damage on a failed save, or half as much damage on a successful one. If the target fails the saving throw, it can't restore health until after a long rest (it does not restore health from the long rest) or until a greater restoration or heal spell of equal level is used on the affected creature. This spell has no effect on undeads or creatures without flesh.