The Realm wherein the Spire and the Gate-towns exist. The Outlands is something between a world and a plane. It is not a spherical world, and it is in fact flat, but if you travel long enough, you’ll find yourself ending up in the same spot again, as long as travel in a straight line. This place has no lords, and martial power is most respected here. That said, it is not a weak place, and when rules of the other realms come here, they suffer a severe reduction in might. At the base of the spire, no source of power other than martial function. This flat, 1 mile radius land is called Common Ground.
Lastly, the Lady of Pain rules Sigil, and while she never leaves the city, warriors who weild her blades rome the Outlands. These terrible blades can harm and anything, and cause terrible pain to their victims.