Armor of the Storm Lord

A protective magical force surrounds you, manifesting as a spectral storm that covers you and your gear. You gain 5 temporary hit points for the duration. If a creature hits you with a melee attack while you have these hit points, the creature takes 5 lightning damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, both the temporary hit points and the lightning damage increase by 5 for each slot.

 The Lightning dawns the caster in a sparking set of ethereal armor shielding them from physical damage while strike back at their attacker.