User blog comment:MiniDaggers/RWBY Volume 4 Commentary Summary/@comment-25936766-20170623001241/@comment-25936766-20170623014456

2-Yeah, they could've at least revealed the name. "The thing Weiss fought in the W-Trailer was a suit of armor possessed by a Grimm, which we call Geist".

....Or hell, at least mention the idea of Ghost Grimm when the WoR of Grimm rolled around.

8-But then, why not just use Electric Dust or Fire Dust? More easily available, and logically cheaper.

....Mistral is either a fake Steampunk or a nation run by idiots. No wonder Oniyuri became a thing at one point.