Demonskin

Uncorking this potion, you are immediately assaulted with a powerfully pungent, acrid odor. Once you drink it, your skin takes on a glowing burgundy hue and your eyes turn a sickly crimson. For 1 minute, you gain a +2 bonus to AC and resistance to cold, fire, and lightning damage, as well as bludgeoning, piercing, and slashing damage from nonmagical attacks. Until the potion's effects end, your creature type changes to Demon (Fiend).