You are a nephalem, one of the rarest creatures, as there are only seven in existence - you, Armal, Balial, Calix, Cerdon, Cyrius, and Damriel. Lucifer had escaped Hell, and was trying to raise the four horsemen of the apocalypse, and the archangels sent you and your brothers on the case. However, when you arrived in Greybull, Sam, Dean and Castiel were searching for Lucifer, and hundreds of reapers were in the street, just staring into space.