Aktul's Magma Mantle

A layer of molten steel fills in the cracks in your armor, bolstering your defenses.

You gain 20 temporary hit points and resistance to fire damage for the duration of the spell. In addition, whenever a creature within 10 feet of you hits you with an attack, a jet of magma streams out from your armor, dealing 1d10 fire damage to the target.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you gain 5 additional temporary hit points for each slot level above 4th.