Board Thread:Speculation House/@comment-25857155-20150116082950/@comment-3146930-20150210205817

I don't feel that the Grimm are in any way a combination of Dust and anything else, at least not the Dust we have seen. The Dust in the show seems to allow people to control the forces of nature, like ice or lightning. We also know from a WoR that Dust can be activated with the use of Aura. However Grimm have no power over the elements and if they were made in some way from Dust, they could explode the second they may contact with Aura or even from a spark from a bullet. It would also be strange if a creature with no soul was made from a material they can't use without one. It is like when animals will overlook plants not in their diet in favor of things they can eat.

It is however possible they are made from Dust, but the kind mentioned in the opening narration that humans are said to be born from. This Dust could be like a primordial soup and they Grimm were the first beings to form from it; but without souls to guide them they turned violent. Humans came into being from the planet's will, giving people souls as a way to counter the darkness spreading across the planet.

Another idea is that at the birth of humanity, a person so full of darkness found Dust and learned how to use it (like he was exiled from his tribe or something, turning him dark). The Grimm were then forged from this destructive impulse explaining why they are drawn to humans and their creations. However over time they went beyond his control and simply kept multiplying, spreading to all corners of the world.