Synza

Synza is an invisible essence that takes creatures as hosts to have them do it's will. His host, although retaining his or her ability to think their own thoughts and see from their own eyes, is under complete physical control of Synza. This means that if Synza wished it, it could have someone kill his or her own comrade and the host would see and think about it the whole time, unable to stop him or herself. Synza wishes to end all life.