From publisher's homepage:
This supplement includes the following material:
- Do-It-Yourself Magic. Guidelines to adding new spells to the existing Helusan and Milondese styles.
- School Building. Step-by-step instructions on creating entirely new systems of REIGN magic.
- The Conjoining Priests of Setekesh. An example build, complete with giants, human sacrifice and the ready possibility of flying monkeys.
- Creatures. Hey, everyone loves new monsters, right?