To qualify to become a Chosen of Bahamut, a character must fulfill all of the following criteria.

A Chosen of Bahamut is a half-dragon who has proved himself to full-blooded dragons and more importantly, to Bahamut, the god of good dragons. Through his actions, he has shown that he is good-hearted and wishes to be closer to his kin. A Chosen of Bahamut becomes more like a dragon in various ways that would be otherwise unattainable without divine assistance.

Bahamut's Breath (Ex): As a favored half-dragon of Bahamut, your breath weapon grows in strength. For every class level of Chosen of Bahamut, the DC of your breath weapon is increased by one. Also for every other level after first and second(1,2,4,6,8,10) as a Chosen of Bahamut, increase the damage of your breath weapon by 1d8. Finally, a Chosen of Bahamut increases the amount of breath weapon usages per day by 1 every three levels(1,4,7,10). You must still wait 1 hour between breaths.

Bahamut's Grace (Su): With the grace of Bahamut behind him, a Chosen of Bahamut gains his Charisma modifer as a bonus to all saves. This does stack with the divine grace ability of a paladin (or others).