This guy apparently has found something very interesting in a curio shop and made the mistake of trying it on without consulting his occultist. He’s just about to kill everyone because of the evil power residing in the mask. Judging by his expression, he is not totally attracted to the proposition.
The idea is not completely my own. Fantasy literature is filled with evil weapons, trinkets, gorilla’s paws and so on. Too attractive not to paint.
Find a larger version here.