At the beginning of the Rane Council, the Pathfinder Society was expelled from Galt. Though their operations were centered in Woodsedge, the Society maintained a library in Galt's capital for years. When the Grey Gardeners arrived to arrest the librarian, they found her dead, having chosen suicide over damnation within Madame Margaery. The Gardeners scorched the library in a violent conflagration, leaving it as testament to the lengths the Gardeners will go to fulfill their duty.
Unfortunately, something went wrong, somehow, somewhere; the 'Lost Library' is now the center of an unnatural affliction upon the city, a psychological disorder that drains the will to live from those who dwell there, that seems somehow to increase the rate of decay. And beneath the husk of the library, an oubliette spoken of as L'Abyss descends into darkness and madness ...