The Shattered Temple

The faction headquarters of the Athar stand at the heart of a zone of destruction several blocks across, known collectively as The Shattered Temple. They've only repaired what little they had to in order to make the temple useable, preferring the broken look of the place. (They are the Lost, after all.) The area's been a ruin for a long time, as anyone who knows anything about Sigil can testify, but there's no clear hint as to what caused it. The best guess is that it involved the Lady of Pain and a conflict with a rival power. That would explain the broken temple, once belonging to the power Aoskar, which is now the Athars' home. Whatever the cause, the area's considered ill-omened by most, and nobody has ever built there since.

Note: The Shattered Temple originally appeared in the Planescape AD&D campaign setting from TSR. Additional information can be found in In the Cage: A Guide to Sigil. Its use here is for the purposes of providing context for the campaign only.