Armor of Boreas

A protective magical force surrounds you, manifesting as dancing lights of blues and purples, covering 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 thunder 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 thunder damage increase by 5 for each slot.