A ring of flame erupts from you in an aura with a 30 ft radius. When you first cast this spell, each creature within the radius must make a Dexterity saving throw. A target takes 4d10 fire damage on a failed save, or half as much damage on a successful one.Until the spell ends, you are immune to fire damage, and the aura moves with you, centered on you. In addition, whenever a hostile creature within the aura takes fire damage, it takes an additional 2d10 fire damage.