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- Rules and unit profiles covering every unit, weapon, and piece of wargear available to the Taghmata Mechanicum, Titan Maniples, and Knight Houses in Warhammer: The Horus Heresy
- Warlord Traits, a unique Reaction, Cybertheurgy, and Orders of High Techno-arcana
- Rules for fielding two Divisio Tactica: the Titan Legions and the Questoris Households
- Profiles for three unique characters
- A visual showcase for a variety of Mechanicum forces