Elemental Armor

You cover yourself with a layer of elemental energy that shields you from incoming attacks. Choose one damage type when you cast this spell: acid, fire, cold, or lightning. You gain 5 temporary hit points when you cast this spell. If a creature hits you with a melee attack while this spell is active, that creature takes 5 damage of your chosen damage type. The temporary hit points granted by this spell are lost when the spell ends. When you have no temporary hit points, the spell ends early.

When you cast this spell at 2nd Level or Higher you gain an additional 5 temporary hit points and inflict up to 5 more points of damage to an opponent for each level you upcast this spell.