From publisher blurb:
Everyone—even the powerful—has enemies, and the Nameless Mage was no exception. In a hedge against future calamity, the Nameless Mage created the Hidden Sanctum—a bolthole of last resort—buried deep below present-day Dulwich. Never used, at least for its intended purpose, the Hidden Sanctum has mouldered and decayed, forgotten and abandoned, through long centuries of darkness and neglect.
Now, a wealthy merchant, carrying out repairs in the deepest part of his cellar, has made a curious discovery—a rubble-choked set of stairs and a seemingly endless array of dungeons and caverns—and needs a band of brave adventurers to explore whatever lies within…
This Dungeon Backdrop is designed for the town of Dulwich in the Ashlar mini-campaign setting but can be easily inserted into almost any fantasy campaign. It is a sequel to Lost Cellar of the Nameless Mage and Forbidden Halls of the Nameless Mage but can be easily used as a standalone dungeon.