Find a wall covered in ivy, vines, moss, or similar, and clear that vegetation away. Using chalk and charcoal draw a realistic door (with keyhole, hinges and doorknob) on the surface below. Write upon the door: “Ynn, by way of [the current location]”. Leave, so the drawing is no longer visible, and on return the drawing will be replaced by a real door. When it is opened, the Gardens of Ynn will be on the other side: infinite, overgrown, extradimensional. This realm is full of magic and treasure, worthy of exploration and plunder by sellswords, occultists and adventures. The doorway remains there for a full day, after which it fades away as if it never existed, leaving anybody still on the other side stranded.

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 whimsy, delight and surreal perils, so that even the procedurally generated adventure is novel and tightly themed. The Gardens of Ynn is statted generically for Old School systems, allowing it to be easily converted into any fantasy adventuring system.