After the defeat of the Manhunter Cult during the Millennium Event, the android race remained in the shadows until a new Grandmaster was installed who led them. This being was Hank Henshaw who commanded the machines from their secret world of Biot with one of the many new creations he introduced were the Willhunters. These were nanites that committed a bio-invasion of a victim's nervous system where they suppressed their consciousness and began reprogramming the individuals mind. This left the victim in a catatonic state where they were unable to act without orders from Manhunters or their leader. They had the ability to read their victim's mistakes and regrets by triggering those memories which flooded the individuals minds with those images in order to break that person's will thus allow