Dive deeper into the brutal betrayal of the Dropsite Massacre with this thrilling 48-page softback expansion. Revisit one of the Heresy's most iconic battles through fresh perspectives, while adding three brand-new units for your Legiones Astartes to unleash on the battlefield.

Also included is a gripping Legendary Mission that puts you in the boots of the first wave striking at Horus fortified position relive the desperate fight in the Urgall Depression and see how your forces measure up!