Book 4 in the Iron Gods campaign: A great threat is rising in Silver Mount, but a precious item belonging to a mysterious entity called Casandalee has yet to be found. With the Dominion of the Black still an ever-present danger, players must navigate a dangerous canyon, the Scar of the Spider, in hopes of learning more about their enemies, and to accomplish their mission.

Part 4 of the Carrion Crown Adventure Path brings the heroes to the small fishing village of Illmarsh. The party is searching for a dark rider of the necromantic Whispering Way cult and will discover the strange practices of the deeply religious inhabitants of Illmarsh. Rumors of madness, strange disappearances and human sacrifices to things best left unnamed lead them to investigate the town church and its history. They'll find a desperate people, caught in a war between beings from beneath the seas and invaders from the darkest corners of the cosmos. Can the heroes save Illmarsh from its tradition of terror? It is worth noting that this story is heavily inspired by The Shadow over Innsmouth by H.P. Lovecraft and the role playing game Call of Cthulhu. If you're planning on going through the whole adventure path of Carrion Crown, the module Carrion Hill could easily be fit between book 3 and 4, as the party will travel directly through the area where this one shot adventure takes place. This book includes: - “Wake of the Watcher,” a Pathfinder RPG adventure for 9th-level characters, by Greg A. Vaughan - Blasphemous secrets of the foul faiths known collectively as the Old Cults and sanity-shattering gods such as Azathoth, Nyarlathotep, and Cthulhu, by James Jacobs - A giant bestiary filled with eight classic monsters inspired by the writing of H. P. Lovecraft and the tales of the Cthulhu Mythos, by James Jacobs and Greg A. Vaughan - Laurel Cylphra’s discovery that the dead aren’t the only dangers in Ardis in a new entry into the Pathfinder’s Journal, by F. Wesley Schneider.

Citadel of the Void Dragons is a void dragon lair suitable for four characters of 14th level. It is a logical sequel to Sky Stairs of Beldestan, but it can be played independently. The void dragon Astraxis and his mate, Yrsinestra, have long lived in an orbital citadel where the sky meets the void. This location allows the dragons to communicate with malign creatures of the void and still enables them to feast on the whales, cattle, and other large animals of the firmament below. This ready food supply is urgently needed right now, because the mated pair has recently laid a clutch of eggs. As a result, Astraxis is almost never at the lair—he is constantly on the hunt, bringing food to Yrsinestra and often sleeping on the earth below the citadel.