|Colours||Light-Grey with Yellow Helm|
An obscure chapter, ie, no fluff. These guys are sadly confused with another Chapter named "Harbingers". Since people would assume that the "Harbingers" and the "Imperial Harbingers" are the same chapter, this has led to many sources for both Chapters to be swapped back and forth. It's like the Iron Hands and the Iron Warriors all over again, except made even more unclear. This is made all the more confusing with the existence of the Harbinger super-heavy bomber employed by the forces of Chaos.