Armor of Surtur

A protective magical force surrounds you, manifesting as a spectral flame that covers you and your gear. You gain 10 temporary hit points for the duration. If a creature hits you with a melee attack while you have these hit points, the creature takes 5 fire damage.

Additionally, before the spell ends, you may choose as an Action to remove all remaining temporary hit points from this spell. As part of this action, you may touch a willing creature other than yourself and heal them for a total number of hit points equal to the remaining temporary hit points available when you ended the spell early. Alternatively, you can use a Bonus Action and end the spell early to heal yourself for the remaining thp.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, both the temporary hit points and the fire damage increase by 5 for each slot