Dragon Champion

I just finished a book called Dragon Champion By E. E. Knight. The book starts with a fight between a scaleless dragon and it's red scaled brother. The reason this happens is because all male dragons fight for who gets to live in the nest whoever wins gets the nest with his mom. The dragon who becomes champion of the nest is named AuRon. AuRon is a very rare breed of dragon one reason is because he is a grey dragon and another is because his skin changes color depending on his environment. Also he doesn't make noise as he climbs because he doesn't have scales. AuRon grows and has to run because away because their nest is found by dwarves and elves who are dragon slayers created by the elemental powers that you find out about earlier in the book. AuRon gets captured soon after escaping the nest with his sister. Then as the book draws to a close AuRon is trying to find the dragons weakness. He finds it but has to kill hundreds of people to find his answer.