Channel Aspect

As an action, you can call forth the aspect of an ancient dragon that surrounds you, and it unleashes its power through you. Choose a damage type from the following: acid, cold, fire, lightning, or poison. Also choose either a 20-foot cone, or 45-foot long 5-foot wide line, for this feature's area of effect. Creatures in the area of effect can make a Dexterity saving throw against your spell save DC. A creature takes 4d8 damage on a failed save, and half as much on a successful one. If you resist the damage type chosen, the damage increases to 6d8 damage on a failed save, and half as much on a successful one.