This 152-page hardback book contains:
Background and lore:Information on the Mechanicum, their organisation, and examples of their forces.
Rules and unit profiles:A guide to army building, plus rules for units, weapons, and Wargear available to the Mechanicum in Warhammer: The Horus Heresy.
High Tech Arcana:Rules and Detachments for the following faction traits: Archimandrite, Cybernetica, Lacrymaerta, Myrmidax, Reductor, Malagra, and Macrotek.
Cybertheurgic Rites:Additional rules that reflect the esoteric ways in which the Mechanicum does battle.
Machina Malefica:Unit profiles for creations infused with the dark energies of the Warp.
Visual showcase:Colour schemes for infantry and vehicles, and a gallery of stunning miniatures photography for the Mechanicum.

You will need a copy ofWarhammer: The Horus Heresy Age of Darkness Rulebook, available separately, to use the contents of this book.