The cult of Hastur no longer threatens Thrushmoor, and now the adventurers discover the final clues needed to solve the enigma of their lost memories. Boarding a riverboat to Cassomir, the adventurers begin researching the manuscripts found in Iris Hill during the previous adventure. From these esoteric tomes, the adventurers discover a ritual that allows them to explore the Dreamlands in order to reclaim the parts of their minds they lost and track down their obsessed and corrupted former employer. After completing a number of bizarre and demanding dream quests, the adventurers find the answer to their fragmented minds, but they learn a greater threat looms over Golarion. Can they survive the perilous Dreamlands and emerge complete or will the adventurers be stranded in a dimension of nightmares? "Dreams of the Yellow King" is a Pathfinder Roleplaying Game adventure for 7th-level characters. The adventure continues the Strange Aeons Adventure Path, a twisted delve into madness that pits the heroes against the cosmic horrors of the Cthulhu Mythos. Several new monsters, a look at encounters found along the Sellen River, and the next installment of the Pathfinder's Journal round out this volume of the Pathfinder Adventure Path. Each monthly full-color softcover Pathfinder Adventure Path volume contains an in-depth adventure scenario, stats for several new monsters, and support articles meant to give Game Masters additional material to expand their campaign. Pathfinder Adventure Path volumes use the Open Game License and work with both the Pathfinder RPG and the world's oldest fantasy RPG.