Harvest of Thorns is a cycle supplement that details one of the silent and hidden confrontations between the Guides and a circle of powerful Tribal priestesses. This book contains the story of a conspiracy reaching back over a decade and the men and women who were caught up in its epic sweep. Included are complete resources for involving your characters in this bitter feud, including a chance to stop a mad Z'bri lord and to learn more of the nature of heartstones and the Guides.