Board Thread:Speculation House/@comment-11188061-20131022124840/@comment-81.156.133.205-20160804215017

Personally I think of the Grimm as part of a 'Gaia' theory where Remnant itself belived that the existance of being's like the four maidens are too powerful and created the Grimm to combat them, this could explain why Cinder was able to make a Grimm come from out of her hand and the Grimm never seem to stop appearing.