In 1994, a city appeared atop an infinitely tall spire that had no sky, no ground, and no way to enter or leave except through magical portals. This was Sigil, the City of Doors, the centerpiece of a campaign setting designed by Zeb Cook for Dungeons and Dragons. Unlike any other fantasy world before it, Sigil was a torus-shaped ring floating in the void, where the only law was the whim of the Lady of Pain, a mysterious entity who ruled without a visible body and whose face was hidden behind a mask of pure white porcelain. The city was a prison for those without a portal key, a place where death was not an end but a temporary inconvenience, and where the very concept of geography had been replaced by the geometry of belief. Cook had been tasked with creating a world that felt vast yet survivable, distinct from the medieval European tropes that dominated the genre, and he delivered a setting that was as much a philosophical treatise as it was a game. The result was a cosmology that solidified the Great Wheel, a complex multiverse of planes that linked the elemental, the ethereal, and the divine into a single, interconnected system. Sigil was not just a location; it was a statement that reality was malleable, that the center of the multiverse was wherever a person happened to be, and that the most dangerous thing in the universe was not a monster, but an idea.
The Architecture of Belief
The Great Wheel cosmology that Planescape solidified was not a new invention but a refinement of concepts that had been brewing since the 1978 Player's Handbook by Gary Gygax. The cosmology was divided into distinct regions: the Inner Planes of elemental nature, the Ethereal Plane, the Prime Material Plane, the Astral Plane, and the Outer Planes, which were the domains of deities and the afterlives of petitioners. The Outer Planes included the Abyss, Acheron, Arborea, Arcadia, Baator, Beastlands, Bytopia, Carceri, Elysium, Gehenna, the Gray Waste of Hades, Limbo, Mechanus, Mount Celestia, the Outlands, Pandemonium, and Ysgard. Each plane was a reflection of a specific alignment or philosophy, and travel between them was possible only through portals or the Astral Plane. Cook had to navigate the complexity of this system while ensuring that low-level characters could survive the journey. He drew inspiration from the gloomy prisons of Piranesi's Le Carceri etchings, the surrealist art of Brian Froud, and the music of Pere Ubu and Philip Glass. The visual identity of the setting was crafted by Dana Knutson, who drew the Lady of Pain, a figure who became the logo of the entire campaign. Knutson's art was so distinctive that it was described as resembling the work of Dr. Seuss, yet with a darker, more nightmarish edge. The setting was designed to be a place where characters could walk off into the multiverse and find something to wonder at, rather than simply fight monsters for loot. The greatest commerce in Planescape was not treasure, but belief so strong it could shape reality.