The Ork Power on Thoas

The ork concentration on Thoas is the immediate target of Guilliman’s expedition. The defenders use the monumental ruins and the network beneath them, turning recovered architecture into difficult military terrain. Their movements and interest in particular locations help the Ultramarines infer what the installation conceals.

The discovery of ancient human weapons complicates the enemy’s role. The orks are dangerous occupiers, but they are not the creators of every threat or the explanation for the former civilisation’s disappearance. The final fighting around the ordnance demands precision from Guilliman. This group record stays with the Thoas force represented in the novel and avoids turning it into a general account of ork society unsupported by the two-book scope.