Vitriolic Armor

A translucent sheath of acid envelops you and your gear, protecting you from harm while damaging your attackers. You gain 2d4 temporary hit points for the duration. If a creature hits you with a melee attack while you have these hit points, the creature takes 2d4 acid 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 acid damage increase by 2d4 for each slot level above 1st.