Firey Rage

While raging, your resistance to fire damage becomes an immunity to fire damage and your AC increases by 1.

While raging, you can add additional fire damage equal to your rage damage bonus to any unarmed or natural melee attacks you make. A creature that is hit with this damage sheds dim light in a 10-foot radius and must succeed on a CON saving throw at the start of each of its turns or take fire damage equal to your rage damage bonus. On a successful save, this effect ends.