Aoskar is the god of portals, doorways and opportunity. He once called Sigil home, but was cast out by the Lady of Pain, who doesn't abide any Powers within her realm. His tale is a cautionary one for any Powers who would claim the City of Doors.
Most people in Sigil have forgotten all about Aoskar. Those that remember dare not utter his name for fear of the Lady. Most followers of Aoskar are killed, or suddenly disappear, mazed by the Lady of Pain, but a few remain, covertly worshipping the fallen deity.
Some of his followers are: