Sigil, City of Doors

Sigil is located atop the Spire in the Outlands. It has the shape of a torus; the city itself is located on the inner surface of the ring. There is no sky, simply an all-pervasive light that waxes and wanes to create day and night. Sigil cannot be entered or exited save via portals; although this makes it quite safe from any would-be invader, it also makes it a prison of sorts for those not possessing a portal key. Thus, sometimes Sigil is called "The Cage".

Though Sigil is pseudo-geographically located "at the center of the planes" (where it is positioned atop the infinitely tall Spire), scholars argue that this is impossible since the planes are infinite in all dimensions, and therefore there can never truly be a center to any or all of them; thus, Sigil is of no special importance. Curiously, from the Outlands one can see Sigil atop the supposedly infinite Spire.

>> MAP OF SIGIL <<

Visited Planes

The Inner Planes

- Fire
- Negative Energy

The Prime Material Plane

- Toril
- Oerth
- Kellinnon
- Ranais
- Tyrrah

The Outer Planes

- Abyss (Plain of Infinite Portals)
- Acheron (Avalas)
- Arborea (Ossa, Pelion)
- Baator (Avernus, Stygia)
- Beastlands (Krigala, Brux)
- Carceri (Colothys, Othrys)
- Gehenna (Khalas)
- Gray Waste (Oinos)
- Limbo
- Mount Celestia (Lunia)
- Outlands
- Pandemonium (Pandesmos, Phlegeton, Agathion)

Transitive Planes

- Astral
- Yggdrasil

The Great Modron March

The Great Modron March is an event that occurs once every Great Cycle (a period of time equal to 289 years, or 17 cycles of the largest gear of Mechanus, each one taking 17 years). During this time, a horde of over 10,000 modrons emerges from the gate of Automata, making its way around the Great Ring until eventually returning to Mechanus, usually numbering a mere few dozens upon its return. Though the specifics behind the purpose of this event are unknown, most believe it to in some way involve the collection of information from across the planes. The method of their collection, however, remains a mystery, as they never seem to ask questions or collect samples, merely march and observe.

Though predictable, this event is still quite hazardous to those in its path, as the modrons simply cannot be reasoned with. Though agreements have been made about the chosen path between marches, once the march begins they cannot be diverted from the path that has been determined for them before their outset. Entire towns have been known to be crushed underfoot as the modrons make their journey through the planes, not to mention the individuals who have suffered the same fate.

The general route of the Modron March has been fairly well recorded over the centuries, though the specific path they choose to take during any one march tends to vary a bit, never following the exact same course. Most believe that the best path for a given year is chosen for them to take before they leave, though the characteristics of "best" are unknown.

Though attacks on the March are common, they're rarely successful. The March may be susceptible to quick hit-and-run tactics, but once prepared for the fight, they're a well-ordered fighting unit, able to repel all but the most deadly of threats. Modrons, being creatures of pure law, are never cruel nor merciful in their defense of the march, merely cold and logical.

When on the March, modron death is met with promotion from within the ranks of the March. Thus, the monodrone forces are the first to be depleted, followed by the duodrone forces, and so on up the hierarchy. This ensures that those who finally reach the end of the March to report back to Primus are the highest-ranked modrons of the group, even if they may not necessarily be the same superiors that started the voyage.

The Cant

Planescape has its own slang, known as the cant.

HERE you can find a list of the most commonly used terms