>High above the Fang, the masterfully built spacecraft of the Grey Knights Chapter remote-scryed the location of the Daemon Primarch, calibrated their weapons batteries, and fired. Searing ruby-red beams shot from the heavens, all four converging upon the same point as the gunners of the Grey Knights fleet brought their deadliest weapons to bear. By rights they should have reduced Magnus to a steaming crater. In truth, they did little more than drive him to his knees; a hemisphere of invisible force protected him from physical attack, no matter how powerful.  (Wrath of Magnus, 7e)