AD&D - New World
Boogeymen. Particularly in frontier areas and unsettled lands, the Night Wolves are the black-cloaked strangers that ride through town just before something bad happens, the flittering shadows seen ahead of a strangled scream, the cause and effect and every bad thing that has happened, or will.
Some conspiracy theorists insist the Night Wolves are not just myth, but are agents of chaos dedicated to winning a war that most thought ended with the great disaster. But to more civilized and learned individuals, the Night Wolves are unreal. There are true terrors out there in the wild, but the Night Wolves are nothing to be afraid of.