The Encyclopedia

 

The Glossary

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!)