Ullanor Prime - War of the Beast: Nearly 1,500 standard years later, in 544.M32, a massive Ork WAAAGH! led by a mysterious Warlord known only as The Beast rampaged across the Imperium, growing in size until it became the greatest Greenskin invasion that the galaxy had known to that date, eclipsing even the one defeated by Horus upon Ullanor Prime at the height of the Great Crusade. The Beast centred his empire upon the long-forgotten world of Ullanor Prime, which by that time had become heavily urbanised by the industrious Greenskins, who covered nearly the entire planet in surprisingly well-organised settlements. The seat of The Beast's empire was the Ork capital city of Gorkogrod, built within a massive temple-Gargant on the exact location where the Emperor and the Primarchs had gathered during the Triumph of Ullanor over a millennia earlier. It was The Beast's intent to use Ullanor Prime as the template to perfect the Ork's Attack Moon concept. Converting the entire planet into a mobile battlestation capable of teleporting itself through the multidimensional realm known only as "subspace," The Beast intended to use Ullanor Prime to destroy Terra itself, eliminating the home of the species that had long been the greatest enemy of the Greenskins.After the world of Ullanor Prime was identified as the original home of The Beast and his massive WAAAGH!, Vulkan, the immortal Perpetual and long-missing primarch of the Salamanders Legion, led the First Invasion of Ullanor. Together, the Astartes Chapters of Rogal Dorn's lineage who comprised the Terra defence initiative known as the "Last Wall" invaded The Beast's capital world, focusing upon the capital city of Gorkogrod. At the battle's conclusion, Vulkan charged into The Beast's massive temple-Gargant, intent on facing the Ork Warlord alone. During their confrontation, Vulkan destroyed the temple-Gargant in a massive explosion, which seemed to obliterate both Vulkan and The Beast. This shattered the cohesion of The Beast's Greenskins, whose resistance collapsed in the wake of the defeat of their powerful Warlord. However, unknown to the Imperial forces, the Greenskin presence secretly endured on Ullanor Prime.A Second Invasion of Ullanor was eventually launched by the Imperium which included several battered Adeptus Astartes Chapters, the newly created Deathwatch, several Astra Militarum regiments, Frateris Templar, Skitarii and Legio Cybernetica cohorts, several Imperial Knight Houses, Inquisitorial Storm Troopers, a small cohort of the Sisters of Silence and a Warlord and Warhound Titan. During the second attack on the city of Gorkogrod, an elite assassination force comprised of several Astartes and other supporting Imperial forces discovered that there were in fact six "Beasts" -- each a "Prime-Ork," a Beast in their own right, and a commander of their own Greenskin "Legion," in mockery of the Emperor and His Primarchs and the ancient Space Marine Legions. When Koorland, the Lord Commander of the Imperium and the sole surviving member of the original Imperial Fists Chapter was killed, the Imperial forces were forced to flee with their fallen commander's body and withdraw from Ullanor.Not long after this defeat, Maximus Thane, the Chapter Master of the Fists Exemplar, led the final desperate Imperial campaign of the War of the Beast during the Third Invasion of Ullanor. The Imperial forces unleashed redirected asteroids as weapons of mass destruction to devastate the Ork-held planet. With the help of the Sisters of Silence and a captured Ork Weirdboy, the null effect of the anti-psyker Silent Sisters joined with the Weirdboy's powers and created a reverse-WAAAGH! effect that utterly devastated the Greenskin hordes of The Beast. During this final confrontation, The Beast was slain.After the War of the Beast concluded, Maximus Thane assumed command over the Imperial Fists. He was elected the new Lord Commander of the Imperium by the Senatorum Imperialis and ordered the Adeptus Mechanicus to enact an Exterminatus upon Ullanor Prime to erase its memory from history and prevent a new Beast from ever arising. However, the Adeptus Mechanicus was reluctant to carry out the order, as its Tech-priests knew that Ullanor was rich with unclaimed alien technology that had nearly brought the Imperium to its knees.For the servants of the Machine God, the acquisition of knowledge superseded all other considerations. Coveting Ullanor Prime and its xenos secrets for himself, Fabricator-General Kubik instead acted in direct contravention of the Lord Commander's orders. By reverse-engineering Ork "telyporta" technology that had been used to move the Ork Attack Moons through "subspace" during the recent conflict, the Adeptus Mechanicus was able to secretly teleport the entire world of Ullanor Prime through the Warp to a new location on the edge of the Segmentum Solar. The uninhabited star system where Ullanor was moved had already been marked for colonisation by the Imperium.The Fabricator-General reported back to the High Lords of Terra that the Ork World had been cast into the heart of the nearest blue supergiant star -- Ullanor was no more. The Fabricator-General then set out to have Ullanor Prime stripped to its core of useful xenos technology. No trace of the Orkish presence upon the world would be left to reveal the truth of the Mechanicus' deception if the planet was later explored or settled by the Imperium.Within only a few standard centuries, the world once known as Ullanor became a prime location for Human settlement due to its virgin status and strategic location in the Segmentum Solar. Once colonised, Ullanor eventually came to be known by a new name, one that would echo down the millennia and become a pivotal point of contention between the Greenskin races and Mankind -- Armageddon.