Board Thread:Speculation House/@comment-25266931-20160116135847/@comment-26872876-20160118072313

Like Moridin says, we have no real clue on Grimm origins. It is even noted in the World of Remnant that mankind has little Intel on them other than their attraction to fear and the fact their bodies dissipate shortly after death. Which, like Moridin says, pretty much means the only real background we have is that they exist with the desire to kill humans.