I'm not sure I understand your question. What rewards are you expecting?
There are Lost Pages quests in several worlds:
Wizard City Krokotopia Mooshu Celestia Avalon Azteca
Each quest series has a boss that you fight, and then a badge that you earn. The drops are 'meh' for the most part, but you do have a chance to earn Dragon Rider crown gear. If you farm the boss that is closest to your own level (the most difficult boss you have access to), there is a slight chance you could earn a bone dragon mount.
Alia Misthaven