From the producer's website: The Broken Urthe - World Guide is a supplement to the Broken Urthe role-playing game. This books contains some more information on Urthe as well as new vehicles, artifacts, items, and many robots to use in your games. This supplement also provides rules to make mutants for characters to become, like humanoid insects or animals. Included are tables to create encounters based on habitat or terrain, along with some traps to add danger to your adventures.