All the rules needed to field your deadly Mechanicum units in games of Warhammer: The Horus Heresy - It contains all the rules and unit entry profiles for both the generic Mechanicum units, as well as all the bespoke rules for the Titan Legions, Questoris Households and a handful of Radical Techpriests - Regardless of loyality this is a must purchase publication for fans of the Mechanicum in games of The Horus Heresy and an excellent purchase alongside the Knight Questoris (54-15) and Knight Armigers kits (54-20)