Armor of Zjarr

The creature you touch glows with an aura that resembles flames, creating an ablative shield. The target gains temporary hit points equal to 4 + your spellcasting ability modifier. In addition, if the target is hit with a melee attack whilst it has temporary hit points granted by this spell, the attacker takes 1d6 fire damage if it is within 5 feet.

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