Steel Men

The Steel Men are the Xth Legion of the Legiones Astartes raised by the Emperor during the First Founding. Once considered amongst the most loyal and vaunted legions, boasting a record matched only by the Sun Angels, they were to become the single most infamous and reviled legion in Imperial history. Under their Primarch, Atlas, they would intitiate the Atlas Apostasy via their betrayal at Taracanis and plunge the Imperium into a brutal civil war.