Thorns Armor

You enchant your armor with magical sharpness. When you cast the spell, your current hit points and hit point maximum both increase by 5. Until the spell ends, any creature that hits you with an attack takes 2d4 piercing damage.

At Higher Levels. When you cast this spell with a spell slot of 2nd level or higher, the hit points increase by 5 and the damage increases by 2d4 per spell level above 1st.