Eldritch Armor 2014

You protect yourself with an acidic coating that sprays outward when struck. You gain 1d4 + 4 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 2d4 acid damage.

When you cast this spell using a spell slot of 2nd level or higher, both the temporary hit points and the acid damage increase by 2d4 for each slot level above 1st, up to a maximum of 9d4 + 4 temporary hit points and 10d4 damage at 5th level.