Board Thread:Speculation House/@comment-11188061-20131022124840/@comment-15049228-20131023022836

Maybe they are similar to the flood? I stated on the Grimm Sentieance Thread about this, saying that their might be a Gravemind esque charecter, either the Grimm's creator or leader, or something like that. The extraction of a soul would, going by Harry Potter, would render the human as a shell, or similar to an animal, with no feelings and such. A living puppet, if you will. Or perhaps a soul is corrupted by the power of Grimm, converting it to the Grimm version. For more info on my Flood theroies, or about Grimm speculation in general, I suggest just looking at the other threads on Grimm Sentience and such. Also, maybe Aura manipulation, therefore soul manipulation, could result in the Grimm being made, also why they retain knowledge or intelligence, as a soul wouldn't store knowledge.