Sanguinius dies but The Emperor salvages his dead son's soul, or at least as much of it as possible and send it to Remnant. 10.000 years later Jaune Arc is born and he grows up wishing to become a hero. Pity that The Emperor's soul-salvaging plans didn't quite work out. See how the young knight deals with mutations, personal issues, love, duties and old memories of a dead Primarch.