Verdant Armor

A thick layer of living bark, interwoven with sharp thorns, wraps around your body. You gain 20 temporary hit points. While you have these temporary hit points, you have resistance to bludgeoning, piercing, and slashing damage from non-magical attacks. Additionally, whenever a creature hits you with a melee attack while you have these hit points, it takes 1d10 piercing damage from the thorns.