Greater Breath Weapon

You have been blessed by an Ancient Dragon. He has in turn taught you how to improve your own breath weapon.

Enhanced Lung Capacity: Your breath weapon attack deals an additional 1d10 damage. 

Breath Work Training: The damage dice for your breath weapon attack increases by 2D10 instead of 1d10 every time it would increase.

Greater Aim: The length of your breath weapon increases by 10 ft.  Additionally you gain a +1 to your breath weapons DC.