During the latter days of the Great Crusade the Fabricator-General of Mars, Kelbor-Hal, had already thrown in his lot with the Traitor Warmaster Horus and committed to his cause. He had been tasked with the construction of a mighty vessel of unique design, an Abyss-class Battleship, built on a scale never before seen by Man. Kelbor-Hal had allowed the commissioning of vast quantities of material, menials and munitions in the construction of the mighty Battleship because it suited his purposes. Horus had unfettered Mars in its pursuit of the divine machine, countermanding the Emperor’s restrictions on what technologies the Mechanicum could research and develop. For Kelbor-Hal the question of his allegiance and that of the Mechanicum was one of logic, and had required mere nanoseconds of com