In Break-In At Bleak End, Don Coriander used former members of the Whistledrop Crew to retrieve information about the Fold's treasure stashed behind the Undermire Dwarf-Door. Following their robbery of Bleak End, the Don realized that their contact was likely distributed throughout the organization, and decided he had to act quickly. He took the entire Glitterati through the Undermire and attacked the Fold in a full-on gang war, but as he feared, his opponents were ready.
They were ambushed, and a short but incredibly chaotic battle followed. Vex and Volition brought the fairies to heel with a small platoon of scouts and Wild Magic from hidden symbols of Virathul. The vast majority of the Glitterati were killed, and Don was forced into retreat with only a dozen members left of his once-prestigious gang.