Horus Heresy: Age of Darkness presents a comprehensive hardcover rulebook with 336 pages of detailed lore, guides, and painting references for Warhammer 40,000 enthusiasts. Published by Games Workshop in 2022, this edition explores the grim history of the Imperium during its darkest era. Designed for the 28mm scale range, it includes extensive background and combat rules to enrich gameplay. Used-Like New.