warhammer horus heresy legions imperialis the rise of the dark mechanicumContained within this 128 page hardback book you will find a comprehensive history of the rift that tore the Mechanicum apart, detailing the corrupt technologies employed by the Dark Mechanicum, as they came to be known. You'll learn of the Doom of Magma City, the largest conflict of this internecine war, and the forces that took part. Also included are rules for both the loyal Mechanicum, and the traitorous Dark Mechanicum, plus their Formations, and