Traitors (道場破り, Torētā) are humans whom were subjected to experimentation and/or injected with Shaula's poison and act as the witch's personal soldiers.
According to Clay Sizemore, Traitors are normal human beings who've been brainwashed into the service of Shaula Gorgon. These humans have been infected presumably by her venom, which has elements of mind control, endowing those with no combat training and/or unremarkable physical ability with a huge spike in potential. In addition, they all experience insomnia and are unable to sleep. By preventing the subject from sleeping, the leader can remove the fear within an individual, creating a "soldier" who never rests or sleeps. This would, in turn, be an ideal fighting force.
High Physical Abilities (高い身体能力, Takai Karada Nōryoku): As mentioned earlier, being subjected to Shaula's poison, Traitors are endowed with greater physical ability and possess a huge spike in potential.
Fearless: Due to the poison, Traitors experience insomnia, in which eventually causes them to lose their fears at the expense of being easily controlled by specific manipulation magic.
Martial Arts (武道, Budō): Certain traitors may take up a number of martial arts. Due to the effects of Shaula's poison, it stands to reason that their skill and potential in such would be increased because of it.