Armor of Lynrith

A protective magical force surrounds you, manifesting as a deep blue lightning that covers you and your gear. If a creature hits you with a melee attack while you have these lightning, the creature takes 1d4 lightning damage. Also, whenever you take lightning damage, you gain 1d4 temporary hit points.

 At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the lightning damage and the temporary hit points increase by 1d4 for each slot.