Draconic Breath

Much like kin of dragonborn, you too have learned to harness your potential in the form of destructive energy. The damage is determined by your draconic ancestry. 

A blast of destructive, elemental force exhales from your mouth. Each creature in the area of the exhalation must make a Constitution saving throw. 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. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level.