Ork Empire - Ork Empire of Ullanor: During the Great Crusade era, the Ullanor Sector was ruled over by the Ork Overlord Urrlak Urruk from the world of Ullanor Prime. The central foundation of his empire was a dozen planets, originally inhabited by Humans, which had been conquered and enslaved by the Orks. Horus employed the use of the now famous "speartip" tactic to destroy this massive Ork empire by first removing its head and then letting the remaining Ork Warbosses fight each other for supremacy, thus making them easier for the Imperium to divide and conquer.The White Scars and Ultramarines Space Marine Legions, supported by the Excertus Imperialis and other forces such as the Legio Titanicus of the Mechanicum, attacked the outer planets of the Ullanor System. This offensive was a decoy, though it proved quite effective. Many of the Orks' starships rushed to prevent the attacks on the outer planets, leaving the central planet dangerously vulnerable and exposed to the waiting main body of the Imperial forces, led by the Astartes of the Luna Wolves Legion. The Luna Wolves' Legion fleet headed straight for this central world, and more specifically for Urlakk's fortress-palace.The main attack force dedicated to capturing the capital planet of the Ullanor System consisted of the entire Luna Wolves Legion, over 2 million Imperial Army soldiers, and one hundred Titans of the Collegia Titanica, including Titans from the infamous Legio Mortis. All of these forces were later joined by the Human slaves liberated from the Orks' labour camps by the invading Imperial troops. This force was led by the Emperor Himself; though Imperial records do not indicate what role he played in this action. Little is known regarding the actual makeup of the defending Ork forces. However it is known that they outnumbered the Imperial troops by a 5-to-1 ratio.Ignoring the Greenskin masses, Horus and his Legion struck directly at the Overlord and his command coterie of Ork Nobz and Ogryns, leaving the enemy headless and without direction. The attack took place by Drop Pod, with heavy gunships deploying Imperial armoured vehicles to the battle zone. This force attacked the perimeter defences. Horus then teleported to the base of Urrlak's great central keep, the Tower of Ullanor, accompanied by all of the Terminators from the elite 1st Company of the Luna Wolves. Whilst most of the Terminators held off the Greenskin horde, which was rushing back to the tower to defend its master, Horus fought his way up to the pinnacle of that great edifice, accompanied by only the 10 Terminators who were the members of the Justaerin Squad of First Captain Ezekyle Abaddon.At the summit of the Tower of Ullanor was a vast throne chamber where Horus found the Ork Overlord surrounded by 40 of his biggest Nobz. Horus immediately stormed into battle, utilising the twin Lightning Claws of his power armour to rip apart the enemy in close combat. The Terminators were unwilling to fire into this melee, lest they hit their beloved primarch. The Terminators therefore immediately fell upon the Orks with their own close-combat weapons.Eventually, Horus hacked his way through the Overlord's bodyguard, until he came face-to-face with Urrlak, a truly gargantuan Ork Warlord. Despite the fact that Urrlak was an immense, towering, green-skinned brute, Horus managed to cripple the Ork leader in the following duel. Horus held the Ork Overlord aloft above his head and carried him to the battlements of the Tower of Ullanor. Horus threw the screaming, bloody form of the Ork Overlord down to the ground, ending the reign of Urrlak Urruk with a green-blooded splat. When Horus returned to the throne chamber he found all the Terminators and Orks dead...apart from one. The sole survivor he found was none other than the gore-drenched captain of the 1st Company, Ezekyle Abaddon. He was surrounded by a great pile of broken Ork bodies.With the death of its leader, the Ork forces collapsed into infighting as was their wont and the battle for Ullanor soon became a massacre, as the remaining Orks found themselves trapped between the two forces of the Luna Wolves, including the remaining Luna Wolves Terminators at the base of the great central Tower of Ullanor and those who had breached the perimeter walls of the tower complex.The remainder of the Ullanor Sector was ultimately subdued by the forces of the Great Crusade and returned to Imperial rule within the standard year, as the Ork empire had completely fragmented upon hearing of its master's death once the various Nobz declared themselves the new Warlords and fought each other for control. With Urg's termination, the nascent Ork empire self-destructed, and the xenos that were not hounded into the mud of Ullanor's vast battlegrounds would be hunted down across hundreds of star systems, all the way to Chondax, the Kayvas Belt and beyond.