The Horus Heresy Journal Tactica: Skitarii - The Steel Hand of Mars 31-146 New is a core rules book for Warhammer 40K by Games Workshop. It focuses on the Skitarii army, providing players with in-depth tactics and strategies for their gameplay. Written in English, this book is a valuable addition to any Warhammer 40K collection, offering bulk content for players to enhance their gaming experience. Perfect for enthusiasts looking to expand their horizons in the Warhammer 40K universe.