Amarok

Amarok is an antagonistic figure found in the mythology of the Inuits and seems to be example of a nocturnal spirit designed discourage people from wandering off alone at night (which would be a dangerous thing to do in the first place).

Amarok is believed to be a gigantic wolf that will track down those who are foolish enough to hunt alone at night and devour them, unlike real wolves Amarok always hunts alone and may either be considered a type of cryptid or a supernatural creature depending on on one's view on the myth.