Mindtrap
From A Wheel of Time Wiki
A Cour'souvra, or mindtrap, is a device used to trap a victim's soul. It is constructed of crystal and wire. This is probably the most effective tactic to use on a channeler. It is only possible to activate it in Shayol Ghul, using the blood and saliva of the channeler, due to the malleability of reality there. Using a Cour'souvra the victim's soul -- or at least the essence of it -- is trapped and that person can feel it trapped in the Cour'souvra and know when someone is touching it. The holder of the person's Cour'souvra has complete control over that person and, should the Cour'souvra be crushed, that person will become a mindless puppet, subject to the will of the holder.
