From the introduction: A crevasse in the cliff face wends into darkness. Ancient sconces dot its walls. It twists a few times before opening up into a small cavern. Opposite the crevasse, a pair of fat braziers rest on the floor, flanking a set of heavy iron double doors that hang ajar, carved with images of people engaging in various perversions. The thick crossbars across the middle of the doors are carved with runes in an ancient tongue.