Vostroyan Firstborn

The Vostroyan Firstborn is the name given to the Militarum Regimentum of the Astra Militarum that originates from the Industrial World of Vostroya located near the Halo Stars in the Segmentum Obscurus. The Vostroyan regiments have served the Emperor for countless centuries, though in truth they fight to absolve themselves of a terrible shame incurred by their ancestors over ten millennia ago when, during the dark days of the Horus Heresy, Vostroya failed in its duty to the Emperor of Mankind.