Thalgrasli's Armor

Striking a piece of flint against your armor or any other metal you carry you say the command word and a protective magical force of lightening surrounds you and your gear. You gain 15 temporary hit points for the duration. If a creature hits you with a melee attack while you have these temporary hit points, the creature takes 15 lightening damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, both the temporary hit points and the lightening damage increase by 5 for each slot level above.