Knowledge is power. Power corrupts.
As any physicist will tell you, power is a function of energy, and energy and mass are interchangeable. Put enough books in one place and it distorts the world around it into strange shapes. Eventually, it forms a wormhole, linking the library to other libraries. The space between is a pocket realm, budded off from reality, maintained by the sheer power of books.
Somewhere in any big enough and old enough library, there will be an unmarked door. It is invariably locked, and probably hidden, perhaps behind a shelf against the wall, beneath wallpaper, in rooms the public are barred from entering, or under a painting or sign. Find it, unlock it, and on the other side the shelves continue.
Scholars have known about this—or at least had their suspicions—for centuries. They know that if you spend too much time in the Stygian Library, you don’t come out.

The Stygian Library is a point-crawl adventure set in an infinite extraplanar library. Each expedition randomly generates a new route as it explores, resulting in different vistas being unlocked with every visit.

The 160 page adventure location is a perfect toolkit for generating a zero prep session or campaign for fantasy adventurers, no matter the system or the sub-genre. Every room is stacked full of mystery, charm and baroque gloom, so that even the procedurally generated adventure is novel and tightly themed.

The Stygian Library is statted generically for Old School systems, allowing it to be easily converted into any fantasy adventuring system.

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