Sigil

Sigil is a demiplane and one of the largest cities in the planes.
==General Information==
Sigil is most commonly known as the City of Doors, thanks to the portals that connect it to the rest of the universe. It is a reflection of everything that is, everything that was, and everything that yet could be, represented in the form of an enormous planar metropolis. It is a plane unto itself, existing outside the structure of the rest of the universe, that consists solely of a filthy, noisy city with smoke-choked alleyways and crowded streets. Sigil is built on the inside of a gigantic, hollow ring that has no outside. It has a population of around 250,000 which consists of representatives of nearly every race. The Lady of Pain, a mysterious figure of immense power, rules the plane.
The portals of sigil are not specially marked, ornate gates. Any bounded space big enough for someone to pass through - from a sewer entrance to a wardrobe - might double as a portal to another plane. Any average, doorway, window, arch, fireplace, or chimney might be a portal in addition to serving its useful mundane function. However, most need a portal key to activate - a specific object that has some affinity for what's on the other side, or sometimes merely a word, a gesture, or the right state of mind.
Category:World Backstory