From the back cover: "The World of Aden features everything you need to start a role-playing campaign in this exciting fantasy setting. You'll learn about the kingdoms of Aden, the Orders that serve them, and the hideous nocturnals that threaten their very existence. Delve into the secrets of mechamagic; ride one the awe-inspiring thunder trains; battle to save a world from overwhelming evil. Also included are character templates for use in the World of Aden, new equipment, spells and Background Options." and "Based on the hit computer roleplaying game series by SSI."