When the Adeptus Mechanicus invokes an ancient pact with the Dark Angels, Ezekiel, Grand Master of the Librarians, must lead the 5th Company to liberate the planet of Honoria from a vast ork army. Even reinforced by the regiments of the Astra Militarum, the Dark Angels face a tremendous challenge, and the Adeptus Mechanicus appear to have their own reasons for becoming involved in this conflict...