Sigil

Sigil, also known as The City of Doors or The Birdcage, is the city at the center of the multiverse. The torus-shaped city sits atop a needle-like spire in the middle of the Outlands. Sigil is presided over by the Lady of Pain and inhabited by fifteen factions.

Description
The city, being on the inside of a torus, has no sky. When one looks up, they see the streets and buildings on the opposite side of the tube. The city is kept lit by an intrinsic luminescence of its air, which waxes and wanes creating the appearance of a 24-hour day-night cycle. The brightest moment in the cycle is referred to as "peak" and the darkest point is referred to as "antipeak".

According to official measurements by the Harmonium, the city's primary diameter―that is, the ring's diameter―is 5 miles, with a circumference of 20 miles. However, it is important to note that the streets, buildings, and even size of the city is in constant flux according the the whims of the Lady of Pain.

Weather on Sigil alternates between foul-smelling smog, frequent chilly rains, and somewhat clear weather. The haze from the city's myriad chimneys is a near constant, often reducing visibility to about 10 yards, or even down to 5 feet in the worst cases. When it rains, it is common for the water to mix with the walls' and the air's impurities and turn to a brown drizzle. After it rains, the city air clears out for a while, with light breezes and a pleasant cool temperature.

Wards of Sigil
Sigil is divided into six wards, each with its own purpose and character.


 * The Lady's Ward: The richest and most exclusive section of the city, home to the elites of society and of its government.
 * Market and Guildhall Wards: Home to traders, craftsmen, artisans, and guild members, this is the main location for purchasing goods and services.
 * Clerk's Ward: An affluent district, home to most of the city's lower-rung bureaucrats and middlemen.
 * Hive Ward: The slum and the ghetto, home to the poor, the rogues, and the unwanted dregs of the city.
 * Lower Ward: An industrial district, clogged up with the smoke from the foundries and from the portals to the Lower Planes.

Flora and Fauna
Aoskian Hounds. Two-headed, pale, and vicious these dogs are often used by the high-ups of the city as guard dogs or by the Harmonium and Mercykillers to track fugitives.

Cranium Rats. A nuisance in all corners of the city, the Hive Ward is especially plagued by the psychic rodents. The sanitation department offers 3 gold per cranium rat exterminated.

Dabus. Dabus are the only race unique to Sigil, having existed there since the creation of the city. Their origins remain unknown, but they work on behalf of the Lady of Pain maintaining city infrastructure.

Executioner's Ravens. These Sigilian ravens are charcoal gray, though their beaks and heads are often stained red from blood after spending their time at the leafless tree.

Pack Animals. Most animals (and people, to be honest) get sick from the smoggy air, especially in the Lower Ward. As such, most people don't keep their animals in the city for long.

Razorvine. Another constant irritation for Cagers, cutting back razorvine is a constant chore. Its heart-shaped leaves hide the bladed thorns covering the stocks of these fast growing creeping plants.

Travel
The only way in or out of Sigil is through the various portals spotted around the city. Any spells or items that teleport a creature or object to another plane of existence simply does not function. Portals can function either in one direction or both, can be permanent or temporary, and each one requires a specific key. That key can be an object, a passphrase, or simply the way in which one travels through the portal.

Extradimensional vs Demiplanar
Items and spells that create extradimensional spaces, such as a bag of holding or Mordekainen's magnificent mansion that create an extradimensional space still work within the city limits because extradimensional spaces (in Fifth Edition Dungeons and Dragons) are areas that have their volume stretched beyond the normal limits of their containers, but those spaces still exist within the the space of whatever plane they are on.

Items and spells that create demiplanes, such as banishment, do not function within the city limits because those spells create a different, usually small, plane of existence and allow creatures or objects to teleport to that created plane. The demiplane is not on the same plane of existence, therefore, they cannot be reached within Sigil.

Portals to and from Sigil
Sigil is home to the most portals in the multiverse. They are controlled by the Lady of Pain who will open new ones or close old ones without warning. These portals are the only way in or out of the city. Here is a list of portals currently known to the players and how to access them: