Primus Medicae - Notable Primus Medicae: Fabius - Fabius was a primus medicae of the Emperor's Children Legion during the Great Crusade and Horus Heresy and later its Chief Apothecary. Fabius repeatedly attempted to use his extensive knowledge of cloning and genetic engineering to create superhuman beings under his control. Now known as the independent Chaos Lord Fabius Bile, the former Emperor's Children Apothecary continues in his quest for knowledge to match and eventually exceed the Emperor's original scientific achievements in creating the primarchs and the transhuman Legiones Astartes, in the hope of creating a truly perfect Human form. Travelling the galaxy more widely than any other Chaos Lord of the Traitor Legions, Bile has earned a number of epithets and aliases from those who have suffered the effects of his vile experiments.Mawdrym Llansahai - Llansahai was a primus medicae of the Night Lords Legion during the Great Crusade and Horus Heresy. Llansahai was known as "The Smiling One" and "Bloody Bones" by his fellow Legionaries. He had been pushed past the bounds of sanity due to committing ever darker acts in the performance of his duties which included interrogation and torture. Deemed insane, even beyond the measure of a typical Night Lords Legionary, Llansahai found himself being punished for performing illicit experiments in pain upon his victims after it was discovered that he was carrying out numerous unsanctioned vivisections and surgical experiments. He was dragged before his Primarch Konrad Curze in chains for censure and possible execution. His life was temporarily spared, but he was forced to bear the mark of his shame by wearing gauntlets painted arterial red, a Nostraman gang tradition that was carried over into the Legion practices of the Night Lords. This punishment indicated that Llansahai was deathmarked, but as a condemned individual living on borrowed time, he still had labours to perform before he would be allowed to die. During the Drop Site Massacre of Isstvan V, Llansahai worked sadistic tortures upon the Loyalist Astartes who lay wounded and dying in the Urgall Depression. The insane Apothecary managed to survive both enemy action and attempts on his own life by his fellow Legionaries. His devil's luck for surviving these attempts only seemed to further cement his sinister reputation.Vicente Sixx - Vicente Sixx was a short-lived primus medicae and Chief Apothecary of the XIX Legion, the Raven Guard, in the wake of the terrible losses sustained by his Legion during the Drop Site Massacre. A novice at the arts of medicae by most standards, Sixx's promotion was dictated by dire need as the Raven Guard's primarch, Corvus Corax, had been granted technological and arcane knowledge by his father the Emperor on how to improve the XIX Legion's gene-seed and thus enable the Raven Guard to rapidly recover from its terrible losses at Isstvan V far more quickly than the Traitor Legions would readily expect. The Emperor provided Corax with undifferentiated primarch genetic material taken from His own laboratories, and the Raven Lord assigned Sixx the task of using it to perfect a new way to create Astartes rapidly. Unfortunately, the Raven Guard had been infiltrated by members of the Alpha Legion during the Drop Site Massacre and these Traitors proceeded to sabotage the project. Sixx was slain by the infiltrators even as he sought to rectify his errors.