Aspects of the Crucible: Breath

You temporarily gain an air sack, which you use to breathe fire out of your mouth. Everyone within a 15 ft cone must make a dexterity saving throw, taking 4d6 fire damage on a failed save and half as much on a successful one. At the start of your turn, you can use your action to force the saving throw again for as long as you maintain concentration. For every round you maintain concentration, the damage decreases by 1d6 until the spell ends. If you use your action for anything but forcing the saving throw, the spell ends.