Maybe? Mate, I'm not trying to give you the runaround or anything, but "voice in your head when you're stressed" could be any number of things. A demon, a curse, schizophrenia -- whatever this hardware is.

[ There must be something, though. She's trying to think back through various traditions. ]

A spell to calm the mind ... Maybe a binding? Is he aware of it? Can he control it at all on his own?