From the back cover:
"At long last, the definitive magic book for the Talislanta Fantasy Roleplaying Game is here! Codex Magicus brings the critically acclaimed Talislanta magic system to life. Full of detailed magical lore from ages past and tips and tricks for playing magicians in this dangerous and unique world, the Codex Magicus is a must have for Talislanta fans.
Along with detailed historical lore, players and gamemasters will love the fully detailed description of the Omniverse including Adventure Hooks for plane-spanning campaigns. As an added bonus, you asked for it and we're giving it to you... the Astromancy Order is back by popular demand."