The Void Dragon is inside the Noctis Labyrinth on the Imperial Forge World of Mars. It is believed that during the "Dark Age" of technology the Tech priests found the ancient presence, and worshiping him the Void Dragon saw fit to give them greater technology than they currently possess. From this reasoning many of the Imperium's modern weaponry were inspired by him, under the master strategy formulated by the Emperor who bound the Void Dragon to his will. As a result, the Adeptus Mechanicus has successfully adopted many Necron and other reality and time warping races' technologies, causing them to maintain and supplement the vast stores of Golden Age, DaoT, and STC technology provided by the reforms of the Emperor and the trillions of additional Explorer Mechanicus fleets and Rouge Trader forces.