Guildhall barracks the reserve sluggalos converted into something Imani refuses to describe.
The small reserve group of Sluggalos left behind while the rest fight with the 101st Crocodiles and the 105th has taken over the guildhall barracks and turned it into some sort of slug clubhouse. Imani went in there earlier, immediately noped out, and said she didn't want to talk about it. As the crawlers strip The Guildhall before sealing The Bait Shop, Were Castors usher the loudly complaining slugs out of it and into The Castle, where they are apparently right at home in the tunnels beneath the walls.
A guild barracks room repurposed by giant slugs into something unspeakable enough to drive visitors straight back out.
The reserve slugs' den inside the guild, evacuated with the rest of the hall.