Board Thread:Speculation House/@comment-11188061-20131008154955/@comment-15108745-20131011041941

Well, the possibilities, as you said, are endless. They could be guardians tasked with holding the Grimm at bay like those of the Night's Watch in Game of Thrones. Or it could be like Avatar and be only one person. It could be something taught or something passed down from parent to child. It could be the result of some "Chosen One" prophecy.