Enhanced Breath

You can use your action to exhale destructive energy. To use this spell you must cast an elemental spell.  The Shape and size is determent by the draconic elemental. When you use your breath weapon, each creature in the area of the exhalation must make a saving throw, the type of which is determined by the draconic ancestry. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. Area of Effect is 15 ft. cone (Dex. Save)

The damage increases to 3d6 at 9th level, 4d6 at 12th level, and 5d6 at 15th level.