The void is a criminal organization founded and headed by Cylor Nall.
They operate out of The Ankh, a casino and gentleman's club in the Alderia sector of Ultimare. This is how Cylor makes most of his money, but for extra money and power, they work in everything from drug trafficing to prostitution rings to labor racketeering to loan sharking. Cylor treats his gang as a business and won't hesitate to eliminate anyone or anything who is a threat to his business.
The void itself is based on the Sicilian Mafia of the 1930s, so the fashion that these characters wear often reflects that. They are very high class compared to all of the other gangs in the area. The Void is the gang that nearly every criminal in the Alderia sector wants to be in, so Cylor has become very selective about who he lets join the void.