Armor of Isaac

You surround yourself with a ward of stabilizing force, an unseen pressure that resists intrusion. For the duration, you gain 5 temporary hit points.

While you have these temporary hit points, any creature that hits you with a melee attack takes 5 force damage, as the ward converts the impact into an equal and opposing reaction.

At Higher Levels.When you cast this spell using a spell slot of 2nd level or higher, both the temporary hit points and the force damage increase by 5 for each slot level above 1st.