Orks - The Gorro Hollowing: When the Emperor of Mankind revealed Himself to Humanity following the Long Night of the Age of Strife in the early 30th Millennium, He shaped war-torn Terra into a single unified world for the first time in long millennia. Once he had conquered Terra, He looked to taking His Great Crusade to the stars.Having created the foundations of the Imperium of Man, He launched His massive armies out into the galaxy, seeking to bring all of Human-settled space back under the control of a unified stellar empire. During these early conquests, many Imperial expeditionary fleets encountered the Greenskin menace -- a violent xenos species designated as the "Orks" by the early Imperium.Within the Telon Reach was an Ork empire that rivalled that centred on Ullanor, and at its heart was the scrap world of Gorro. The Ork tech-caste, the Mekboyz, dominated the Orks of Gorro and had made the world their own.The dominant tech-caste on Gorro seemed to be fascinated by a form of plasma technology never encountered before or since. Capable of generating destructive yields of terrifying potency, these plasma weapons had done much to blunt the Great Crusade's advance across the Telon Reach. The Emperor decreed that Gorro must be destroyed.When a thousand-strong fleet of warships dropped out of the Warp above Gorro it was the Emperor Himself who gave the order to begin the assault. Horus, Primarch of the vaunted Luna Wolves Space Marine Legion, and ever the dutiful and favoured son, stood at the Emperor's side and watched as tens of thousands of assault craft spread out from the fleet.The Luna Wolves teleported into the scrap layers beneath the planet's surface, forced to hollow out Gorro from within due to the planet's high resistance to orbital bombardment. In the vanguard was the Emperor and by His side was Horus and a guard of black-armoured Justaerin Terminators from the Luna Wolves' 1st Company as well as the golden-clad warriors of the Legio Custodes.As the Space Marines attacked, the Ork resistance they faced was near-overwhelming. The Orks of Gorro were huge and augmented with scavenged bionics. Some stood taller than Dreadnoughts and their weaponry burned through Astartes Power Armour easily.At the height of the battle, the fury of the Orks split the Emperor from His guards. Alone He slew hundreds of them until a blast from an Ork plasma weapon weakened His defences and one of the Ork leaders seized Him. The creature's strength was so great that it took hold of the Emperor and buckled His golden armour.As the creature's grasp closed to throttle the Master of Mankind, Horus stormed through the press of battle and cut the Ork's arms from its body with a single blow. Together father and son led their forces deeper into the vast sphere of scrap until they reached the centre of Gorro.The Emperor worked to collapse the self-sustaining plasma sphere that powered much of the world's scavenged Ork technology and that contained a Warp-fold envelope, so that Gorro would implode into the Warp.The Emperor proved successful, and without its power source, the scrap world collapsed in on itself. A hollow skin of rusted metal around an empty void was all that remained to mark the death of the great Ork empire of Gorro.