This book is an essential guide for anyone who wants to command Titans and Knights in games of Warhammer: The Horus Heresy. It contains the rules you need to field the various deadly and esoteric machines and troops of the Questoris Familia and Legio Titanicus, whether they are loyal to the Emperor or the Warmaster. It includes Detachments, Wargear, and special rules which make these war machines a unique force on the tabletop.
This 128-page hardback book contains:

Background and lore: Information on the Questoris Familia and Titan Legions, their organisation, and examples of their forces.
Rules and unit profiles: A guide to army building, plus rules for units, weapons, and Wargear available for knights and titans in Warhammer: The Horus Heresy.
Engine Kill: Special missions designed specifically for Titans.
Visual showcase: Colour schemes for your mighty war machines, and a gallery of stunning miniatures photography.

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