This 48-page softcover supplement contains:

– Dropsite Massacre Background and lore
– Unit Profiles: Rules for the Master of Descent, Augur Command and Control Squad, and Hyperios Missile Tank.
– Additional rules: The Interdiction Cadre Prime Advantage and Battlefield Assets rules add extra dimensions to your games.
– Legendary scenario: The First Wave Mission

You will need a copy of Warhammer: The Horus Heresy – Age of Darkness Rulebook and either Liber Hereticus: Traitor Legiones Astartes Army Book or Liber Astartes: Loyalist Legiones Astartes Army Book, all available separately, to use the contents of this book.