Pathfinder Adventure Path 146: Age of Ashes 2: Cult of Cinders (2e)
The citadel atop Hellknight Hill has been claimed¸ along with the ring of ancient portals in its basement. What dangers lie beyond this magical portal¸ and what do the cultists who've used it before have in store? There's only one way to find out: the heroes must travel through to the lands beyond¸ where they will make new allies¸ face new enemies¸ and do much¸ much more!