Crystalline Shield

A purple crystalline shield surrounds you, covering you and your gear. You gain 5 temporary hit points for the duration. If a creature hits you with a melee attack while you have these hit points, roll a d6. On a 1, the creature takes 5 acid damage. On a 2, the creature takes 5 cold damage. On a 3, the creature takes 5 fire damage. On a 4, the creature takes 5 lightning damage. On a 5, the creature takes 5 necrotic damage. And on a 6, the creature takes 5 radiant damage. The caster can choose the damage type if wearing a refined crystal necklace, but if not, they must roll to determine the damage type. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, both the temporary hit points and the elemental damage increase by 5 for each slot.