Gaming legend Monte Cook comes to the Pathfinder Roleplaying Game with his first published adventure design in years! The heroes unearth an ancient ritual in a treasure horde that promises power and fortune. The only trouble is, they need a wizard with giantish blood to help them complete it! Venturing to a forlorn cloud giant castle to gain the much-needed aid, the heroes become embroiled in giantish intrigue when they discover the wizard's fortress under assault by hill giants! Will unraveling the giant wizard's hidden past convince him to aid their cause, or will it simply bring misfortune, betrayal, and death? Curse of the Riven Sky is a Pathfinder Roleplaying Game adventure for 10th-level characters.