Sam, Dean and Castiel are currently on hunt for strange activities. Many monsters (demons, okamis, werewolves etc.) are brutally slaughtered. It's a brutal massacre. Castiel however....senses the cause of this....a demigod (you), was responsible for this slaughtering.

Dean: looks around "Dude are we here on a killing-monster challenge?"

Sam: "What the actuall fuck?"

Castiel: senses the power "Thats....impossible. they should have been exctinct since...6,000 years!"