Talk:Grimm/@comment-25110963-20151214180525/@comment-1458758-20151214211749

How it could happen? Well for one, Ironwood built a machine to do it, but if you mean naturally, I assume being a monstrous piece of shit even worse than the likes of Torchwick may do it. After all, we tend to describe terrible people as 'soulless monsters'. Now how we might spawn thousands of these creatures, there was a massive war less than a century ago that might have produced a boom in the Grimm population and it's been noted that Grimm don't need to eat, sleep etc. They're attracted to negative emotions and exclusively assault people. World of Remnant tells us that there's been Grimm as long as there's been people, which all together seems to imply a tacit relationship between the two.

As for spitting in the face of thermodynamics, the last episode literally introduced magic soul power that passes from person to person for centuries. I think we can assume there's shit in RWBY, like the mass of Grimm that vanishes into the aether without a trace, do not adhere to the strict laws of physics.