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 loyalty 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).