The Gatehouse is the last refuge in Sigil for the lost, the hopeless, the insane.
The multiverse is dangerous, not only to the body and mortality, but also to the mind and soul. Dark secrets and horrible truths of a thousand planes can crush the spirit and the snap the thread of lucidity. Many the multiverse does not slay, but instead leaves broken, or mad.
"New blindfold, Shist? Nice new treads too, heh heh heh."
"Welcome back, Indigo. You weren't gone long this time." The medusa is in a secure straight jacket, and also wears a turban in addition to the silk blindfold.
"Yea, some berk tried to nick me, and I blasted her. The Sons responded, and wouldn't you know it'd be Brightwing, again. So they sent me back here. Oh well, it beats a Hive gutter, I guess."
"This place has changed a bit. Looks like just you and I. How are they going to run a 'reintroduction to civil society' dorm with two occupants? And they call us barmy."
"We won't be alone for long ... "
"You know I hate it when you say stuff like that"