The Horus Heresy Mechanicum: Taghmata Army List collects Mechanicum units and rules from The Horus Heresy Books One to Five in a 120 page, hard back book. It includes background and profiles for all of the units available to the Mechanicum Taghmata, Legio Cybernetica and Ordo Reductor armies as well as support aircraft, seven classes of Knight, the Warhound, Reaver and immense Warlord Titans and introduces powerful new units such as the Ordinatus Macro Engines. —description from the publisher

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