You gather volatile lightning in your palms or in the air near you, compressing it into a crackling mass. The friction and heat generated by this concentration ignite the surrounding air, fusing flame and storm into a single blast. You unleash this elemental force in a 20-foot cone.   Each creature in the area must make a Dexterity saving throw. On a failed save, a creature takes 4d6 lightning damage and 2d6 fire damage, or half as much on a successful one. Creatures wearing metal armor, make the save with disadvantage, as the lightning seeks out conductive targets.   Flammable objects in the area that aren’t being worn or carried ignite.