During the Laeran campaign, the IIIrd Legion's Chief Apothecary Fabius discovered upon examining some of the corpses of the Laer that the serpentine creatures had been engaged in extensive genetic engineering to perfect their species, creating a multitude of different castes who were genetically designed to best serve their intended function in Laer society. Bringing his findings to his Primarch, Bile explained that the Laer were not so dissimilar to the Emperor's Children in their approaches to perfection. He put forward the hypothesis that what the Emperor had crafted when he had created the superhuman enhancements of the Astartes was incredible, but he believed that it might be possible to go beyond what the Emperor had accomplished. Fulgrim inquired if Bile truly believed that he could