The Lady of Pain
The Lady of Pain is a mysterious entity regarded as the ruler of Sigil. Everyone seems to have a different theory as to her origin and purpose, but all agree that to draw Her ire is to invite death.
While sightings of the Lady are few and far between, Her dabus servants can be found carrying out various tasks around the city at all hours of the day. When the Lady herself does appear however, all but the thickest, Styx-washed leatherhead are likely to remember it. Some say She appears to personally punish those who threaten the sanctity of Sigil, tossing the fool into one of Her mazes or flaying them alive as a warning to others.
Among the events attributed to the Lady of Pain are the ordering of the fifteen Factions in the Great Upheaval; the destruction of the portal god Aoskar and his entire priesthood; and the fall of the Expansionists, the Communals, and the Incantifiers.