Not to mention being set in the most trans formative period in history. This event is literally the death of the most powerful empires in history. Forever. The Ottoman Empire died in the sands of Arabia. The Russian Empire died in the bogs of the pripet marshes. The Austro-Hungarian Empire died in the Carpathian…

Ya mustard gas can be... disturbing That said it produces a yellow cloud. That said the green cloud is actually chlorine. But it’s got nothing on Phosgene. Many of the more advanced and lethal chemicals are transparent in air.

ummm....