Flay Skin

3rd-level transmutation

Casting Time:1 action
Range:30 feet
Components:V, S, M (an obsidian chip)
Duration:Instantaneous

Choose a creature other than an undead or construct you can see within range. The target must make a Constitution saving throw. On a failure, it takes 8d6 slashing damage and has portions of its skin flayed from its body. On a successful save, the creature takes half as much damage and its skin is not flayed. Creatures with flayed skin that have natural armor take a -2 penalty to AC. In addition, these creatures become vulnerable to acid, cold, fire, and lightning damage. A creature can take an action to repair the flayed skin with a successful Wisdom (Medicine) check against your spell save DC. The skin also mends itself if the target receives magical healing.