There are men out there cursed by beasts of darkness.
Their tongues red with blood, and their minds addled by evil. They were normal once, but night after night, creatures born of shadows slithered into their homes and dripped their blood into the men's lips, blackening their brains bit by bit.
Though seemingly normal, now these men are in control of themselves only until the beasts decide to call upon them. In that moment, all of the men's reason is lost, and they forever turn to witless puppets, following the will of darkness.