If you talk to Ratbone, and then speak to Rakechaser without speaking to anyone else, you get prompted to kill him, possibly without any other options other than leave; I'm not sure. If you then go to the two Ba'atezu in the bar, they act as if you've made a deal with them.
Really? Surprising. Xaositects certainly -seem- mad, and they howl a lot, which seems in keeping with the spell's nature. But I'll defer to your apparent greater knowledge of Sigilian lore. (that's one faction I don't recall ever having heard of)
Qwinn
Torment's setting deviates from 2. ed AD&D Planescape on some points.
The Factions and their role in Sigil was downplayed in Torment , in order for its personal story centered around The Nameless One to flourish. Thus it is a somewhat simplistic or just limited view, we get of the factions, some more than others, and some we don't hear about at all, such as The Bleak Cabal (Though we, IIRC, are not told when, at what point in Sigil's history, the story of TNO takes place). According to 2 ed. Planescape the Xaositects were not mad at all (according to themselves that is); albeit they do seem mad to non-faction members, often, and the Xaositects use this for their advantage by acting even more crazy, when they are around non-faction members, in order to hide their true agenda(s).
Hey, first post.
I do believe the Bleak Cabal are mentioned in Torment. It's in one of the dialogues related to the quests for joining the Believers of the Source, specifically involving the Godsman that has locked himself in his room.