Grissla, a bariaur Sensate, informs the heroes that the Bleak Cabal has a madhouse called the Spider Asylum there. She also instructs the heroes to follow a portal to an area underneath Sigil, which also connects to the Hive.

At the same time, Aus is hired by the Sensates to deliver a wooden box to a Harmonium outpost near the Armory. Hints of a war between the Factions begin to take on a reality of their own.

The area under Sigil is infested with various spidery denizens, and the heroes risk poison and pain to get to the Bleaker contact...