From the introduction: The Bitter Reach is a campaign book for Forbidden Lands, the roleplaying game that lets you step into a world full of danger, where you and your friends together create stories full of mystery and adventure. This book contains both a description of the Bitter Reach, the icy realm north of Ravenland, and the Wake of the Winter King campaign, which describes a number of key people and locations that all play an important part in the events that your characters will be part of in your adventures here.