Originally Posted by
enderlord99
Was that the guy who managed to gain power over the maze he was trapped in, as well as letting other people in and out, and even giving it Harbinger-House—esque anti_lady properties, all by writing "I rule this place, not the Lady" and "This place exists in Sigil's place, but it is not Sigil" and several similar things into a book that was magically always accurate? Or am I thinking of something else?
EDIT: The thing I'm half-remembering has some connection to Umbril, I think.