Wendigo

Wendigo are the host of the souls of the first 18 werewolves that ate lycaon. They happens because there spirits managed to resist the forces of the morthos and resist the oblivion because they have a hunger grater than any of those forces and that hunger is for flesh. Although they can't eat human flesh because they are not physical anymore so they must find human host. They stayed in north america for the last couple thousand years so they could get away from there descendants.