User blog comment:Zathronas/Speculative author: The Grimm and the next season/@comment-78.42.186.25-20141011144507/@comment-67.1.120.162-20141013062520

but itdidn't say dust is only triggered by aura; that's simply how mankind was able to use it originally, before they invented the machines and such that use it now. I agree that only beings with aura can use dust like how Cinder or Weiss use it, but since airships and mechs don't have auras but are powered by dust (along with all of Remnant's tech) I think it's possible for there to be ways for the Grimm to use it. This is pure speculation, yes, but I don't think it's conflicting with what's established