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The Vostroyan Firstborn are Imperial Guard Regiments. Vostroya is a world in the Halo Zone beyond the Eye of Terror, which swore allegiance to Mars during the Age of Strife. It is now ruled by a committee of Techtriarchs, a mix of Mechanicus Magi and more traditional Imperial planetary government. During the Horus Heresy, Vostroya refused to provide regiments to the Emperor, preferring instead to reserve the population in the manufactoria blanketing the world. After the Heresy, the Vostroyans, out of guilt, agreed to supply every family's firstborn son to service with the Imperial Guard