Adventure Background

Carrion Hill crowns a lonely rise above the Wrythe swamps in eastern Ustalav. Varisians, Kellids, Taldans, and worse have built and rebuilt cities atop the same cursed summit—each layer burying the last. Beneath it all lie the Old Cults, libraries of carved stone, and the Sunless Grove where a spawn of Yog-Sothoth was banished two millennia ago.

Recently, the Keepers of the Oldest—Waldur Crove, Arlend Hyve, Rupman Myre, Sulm Marshan, and Glem Baskerwhel—used the Pnakotic Manuscripts to reopen the portal. The spawn returned, slew two Keepers, and now hunts the survivors while ravaging the Tangle and Filth from below. Only by understanding the ritual link between cultist souls and the horror can the city be saved.

Adaptation note: Faithful to Richard Pett's module; mechanics updated for Pathfinder 2e. See PathfinderWiki and EN World discussion.