Board Thread:General Discussion/@comment-26955524-20161126192429/@comment-28288412-20170226215417

Right now Oz's story is the only thing we have on the Grimm's origins. If it's bullshit fine, but without it we have jackshit then, nothing to say Grimm were created besides the song Lusus Naturae I'm fairly sure which itself then proposes they were created in a "Netherworld". The mockery thing is still mentioned nowhere to my knowledge.

Outside of Oz's story, the only thing we know about the Grimm is that they spawn from pools and their currently displayed actions and variations. Nothing about their origins, be they natural or artificial.