Belisarius Cawl - Sedayne Soul-Merge: Cawl and Friedisch successfully fled the Trisolian System and sought refuge on Terra, where Cawl had been recalled under a pretext by Ezekiel Sedayne, the brilliant geneticist and the second director of the Biotechnical Division whose main task was creating and improving the genetic lines of the Legiones Astartes.In truth, Sedayne had grown so old that even rejuvenat treatments were no longer enough to keep him alive. Desperate to achieve immortality so that he could continue his work for the Emperor, Sedayne simply wanted Cawl's knowledge of cloning and soul-merging in the belief that if his psyche was added to Cawl's mind, his personality would reemerge as the dominant one. To achieve his end, Sedayne had his servant Altrix Herminia shoot Friedisch. The geneticist promised to restore Cawl's companion to life only if the Tech-priest agreed to use his soul-merging technology to combine their psyches together within Cawl's own body so that Sedayne could live forever.However, after the merger was completed, Sedayne's personality within their merged gestalt consciousness was overwhelmed by Cawl's own. Upon awakening following the procedure, Cawl relived an old memory of Sedayne when he had first met the Emperor of Mankind early in the Unification Wars. When the Emperor first saw Sedayne, He addressed the scientist as Belisarius Cawl rather than by his own name, for with His potent psychic prescience, the Emperor had foreseen Sedayne's ultimate fate hundreds of standard years in the future.The Emperor explained to the future Cawl in the memory that it would be his responsibility to continue His work, and must continue to do so even on the day that Cawl came to believe that he had betrayed all that the Emperor stood for. The very idea of betraying the Emperor horrified the young Cawl.After the end of the Horus Heresy, Cawl was charged by Roboute Guilliman, then the first lord commander of the Imperium and the new Imperial Regent, to oversee two responsibilities should the primarch fall, one of which was the construction of the life-sustaining suit of Artificer Armour known as the Armour of Fate. The other was the preservation of the Emperor's Sword, the blade given to Guilliman by the Master of Mankind Himself and which contained a fragment of His divine power.Cawl's knowledge of genetics gained from his soul-merger with Sedayne, along with the potent genetic material contained within the device known as the Sangprimus Portum, allowed Cawl to successfully complete the creation of the Primaris Space Marines and implement the Ultima Founding in ca. 999.M41, using candidates kept in stasis deep beneath Mars from the time of the Heresy until the 41st Millennium. This was the culmination of ten millennia of work intended to perfect the Emperor's creation.But over the course of his ten thousand Terran years of work, Cawl changed dramatically. Once a Tech-priest who had disdained the extensive cybernetic augmentation used by other Tech-adepts, Cawl slowly transformed his body until he was far more machine than man.He began to combine more psyches within his own cybernetic intelligence core using the soul-merging technology. Over the centuries, the archmagos was slowly transformed into a gestalt being who is now best described as a mesh of souls rather than a combination of minds. As the millennia passed, Cawl also began to lose much of his memory as he was forced to dump data from his intelligence core's limited storage capacity approximately every 500 standard years.