Being the masters of the mind, psionicists possess the power to induce it into a special state of trance. When used upon a person this power numbs him to the stimuli, which would in other circumstances make him lose his concentration. However, when the stimulus is strong enough this trickery is hardly enough. Each time the mind is put to a test the mental overlay created by this spell is weakened.

The study of mental strength begins from oneself and therefore the psionicist can control his own thoughts more easily than those of others. Theory of mental power and knowledge of mental defence increase the effect of this spell.