Slumbering Tsar: The Hidden Citadel, Part 4: In the Belly of the Beast

From the publisher's website: The belly of the beast, the heart of the evil, the pits of despair, these and many other names are given for the dangers that the PCs face as they explore the Inner Temple, the Upper Cloisters, and the dread Mausoleum high in the upper fanes of the Hidden Citadel—heights where the few who enter find that they have come too far to turn back.