Pathfinder Adventure Path #146: Cult of Cinders (Age of Ashes 2 of 6)

Pathfinder Adventure Path #146: Cult of Cinders (Age of Ashes 2 of 6) - Rules of Play says:

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! The Age of Ashes Adventure Path continues with "Cult of Cinders"—a complete adventure for 5th–8th level characters.