In every world, there exists the fundamental aspects of existence: Time, and Distance. Neither will change for the sake of the other, yet both need the other lest existence itself become unravelled. Order and Chaos, Good and Evil, Rich and Poor, all these are simply concepts that have taken meta-physical form through sentient beings coming through existence at a certain location after a certain amount of time.
Humans came into the world, and fought for their survival, in a desperate attempt for niche in a world where only the strong survive. They fought off rivals, outmanoeuvred their predators and hunted prey. They built tools, and advanced, seeking more knowledge. Knowledge to fight off their ultimate enemy, the antithesis of their very existence: The Grimm.
They raised wooden walls to stop the Grimm from entering their villages, the Grimm simply smashed their way through the flimsy walls and slaughtered the villagers.
They trained young men from farms and hunters to kill the Grimm, but neither mundane blade nor arrow could scratch their shadowy hides. Their families never saw their lovers, sons, brothers, again.
They built stone walls and used sharp steel in their weaponry to guard their people. The Grimm tore through the pathetic attempt with animalistic glee, leaving nought a soul untouched.
All seemed lost, until one day a quarry miner found a glittery substance while digging for more stone to build his home. He collected a bit with some rabbit skins and pocketed it, excited to give it as a gift to his wonderful wife for giving him two more things to love in the world. As he went his half- built home with a wagon load of stone however, he smelled blood, immediately turning his good mood into full blown panic. He reached his home, or rather what was left of it, seeing as three Beowolves had already finished the last of their 'meal'
The miner's inner rage overcame his grief at the loss. He charged in with nothing but his pick axe, the rabbit sack hanging off it and coming loose in his rage. The Beowolves knew the man was coming, they were prepared to 'eat' him. However, as the miner's pickaxe came down, and the claws came up, the rabbit sack came loose, sprinkling the four in a misty air of glittery powder.
The man screamed in rage at his loss. The Beowolves screamed is pain as the glittery substance burned them and weakened their hides enough for a steel weapon to penetrate it.
And so the pick axe then became the first weapon coated in Grimm blood.
Dust was discovered that day.