This 176-page hardback book contains:

• Background for Traitor Titan Legions and Knight Houses
• Revised rules for assembling your battlegroups
• Rules for 16 Traitor Titan Legions, including Legio traits, Stratagems, and wargear
• Rules for 12 Traitor Knight houses
• 19 different maniples to use with your Titans
• Allegiance rules for Traitor Titan Legion Battlegroups, Questor Traitoris, and Questor Mechanicus
• Background and rules for fielding Corrupted Titans, mutated god-engines fielded in the latter days of the Horus Heresy
• 51 Stratagems for use by Traitor battlegroups
• 11 Titan upgrades
• A comprehensive list of weapons available to each Titan, including weapon traits not featured in the core rulebook