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It is the time of the Great Crusade, a time of legend and myth. The Empress of Mankind has sent her greatest generals, her Primarchs, out into the stars to unify humanity under one banner. After dying an ignoble death, an average college student is transported/isekai''''d into a version of Warhammer 30k were Primarchs and Space Marines have been genderbent. Now possessing the body of the only male Primarch, will he be able to change the grim future with his knowledge of the setting or will the galaxy burn?