Black Market

The Black Market was an unofficial network among players from the underground community, which was often associated with the trade of contraband items. Majority of these items were illegal, or created through use via hacking or glitching. Many rare items were duplicated and spread to players through the Black Market such as Twilight, Divine, END, Jade Token, AIDA Sample, and Twilight Bracelet.
After the patch was released which removed the ability to duplicate items, the Black Market has since dwindled in supply.