The 417th Cadian is a unit of Cadian Shock Troopers of the Astra Militarum. They are also known as the "Hellbringers." The 417th Cadian Regiment were veterans of the Damocles Gulf Crusade but met their fate at the hands of an Ork WAAAGH! on Seperus Prime where the regiment was almost completely wiped out by the Greenskins.
- Codex: Imperial Guard (5th Edition), pp. 14, 38