Items. Encounters! A few spells. A feat. Some NPCs. And TABLES!!! Lots of cool tables. Bizarre NPCs, Dangerous Devices, Interplanar Lectures, and Tome Theories are just a few. In Tome Theories, for example, there are six SUGGESTED theories, but it wouldn't take much work for an enterprising DM to expand that to much more. This is great book for people running a Candlekeep Campaign. I highly recommend it.