Quote Originally Posted by Kennedward View Post
If you like, you can bring them all to Lv15, but that'll take you a long time.

But if you're simply aiming for the Prime dragons, then follow me in only leveling up the single color dragons, they eat much less food.
I'll be starting off with aiming for the Primes so will do the single colored ones first. It's strange though that their leveling cost starts off higher, at 3,600, then the double colored ones, at 3,200. This changes at higher levels however.