Board Thread:Episode Discussion/@comment-23712247-20160203074906/@comment-209.182.120.87-20160311090923

I'm guessing that Dust and Grimm are a cycle. When Dust is used the particles congregate and create or spawn Grimm and when Grimm die their particles create Dust or when the "feed" on aura it creates Dust.

I think it is weird that that Grim take on animal forms (although obvioustly not all Grimm do) but we have yet to see a Grimm take the form a human (unless that is what Salem is). Maybe Grimm don't take on aspects of animals exactly but of what most people fear so.. when they came into being most people feared wolfs and bears in an area -> Beowolfs and Ursa. And now since Grimm are around they create more of the same type since people fear those types of Grimm. And the strange types of Grimm were created by "someone" with a fear of dragons or gryphons or whatever and they then propogate now that others fear them.