The Game Master Cyclopedia  includes a wealth of information for GMs to bring greater detail to their campaign. It provides background on the creation of the ruined island, describes the six major zones and many other points of interest including the endless wild dunes, the fetid fens, and the fantastical aspects of the Rift Troweholm. 
 
The full book includes the following:
Adventures and story shards
New mechanics
New creatures & encounter tables
NPCs of import
Arcane artifacts
Political relationships between factions
Storytelling secrets
Answers to the riddles posed in the Player's Gazetteer 
Much, much more!