User blog comment:Zathronas/Speculative Author - What's the deal with Salem?/@comment-10390252-20160218132739/@comment-7622429-20160221142214

Perhaps we can modify parts of this. Maybe all living things that possess Aura come from Dust, just as Humanity did, and the Grimm are living things born without it. And given how Dust is tied to the planet of Remnant somehow, your theory of Dust literally being the whole of Remnant's existence certainly has credence.