The Cerebration Mentor (Also referred to as the Cerebraton Mentor) is a device capable of generating strong emotional impulses and most targets.
It's inventor, Proffesor Watkins had devised it originally as a teaching aid for his 'unruly' classes. However, when the Cybermen learned of their existence, they requested their creator, Tobias Vaughn, to destroy the device. But Vaughns lust for power over his army wanted it to be intact. So he kidnapped Watkins and ordered him to perfect the device, however, the cybermen killed him after they found out of his deception and treason.