The Series - List of novels in the series
The Timeline - (or rather, not much of one)
The Atlas - all you've ever wanted to know and more about the cities and prefectures and gates of 12k
The Characters - Alphabetical
The Bestiary - hanjuu, and shirei, and youma, oh my!
The Society - gods? sages? kirin? political hierarchy, anyone?
The Anime - info about the Twelve Kingdoms anime
The Music - mmm... soundtracks... (and a drama cd!)