"And branded upon the beast, the mark of his kin. For none shall live whom they have seen."
"Albtraume fur Wesen Kinder" - Wesen cautionary tales (Grimm Fairy Tales for Wesen Children)
This quote was not based on anything outside of the show's own mythology. It was taken from one of Monroe's Wesen cautionary tales, the same one he uses to show Nick the Endezichen Grimm Sterbestunde symbol. It's sort of an inside joke taken directly from the script and is unlike anything else we have done before.