Segmentum Ultima - Notable Worlds: Anvilus Nine - A Forge World of the Adeptus Mechanicus.Attila - Imperial Feudal World that maintains a late Iron Age civilisation and almost no advanced Imperial technology. This barbaric world is also the homeworld of the famed Rough Riders of Attila mounted regiments of the Astra Militarum.Baal - Arid Desert World and Chapter homeworld of the Blood Angels Space Marine Chapter.Badab Primaris - Dead World that once served as the homeworld of Lufgt Huron and the Astral Claws Chapter of Renegade Space Marines during the Badab War. Once a thriving Hive World, Badab Primaris is now a radioactive cinder as a result of the final assault of the Loyalist Space Marines upon it at the conclusion of the Badab War in 912.M41.Catachan - Death World and homeworld to the famed and deadly Imperial Guard regiments of the Catachan Jungle Fighters.Charadon - Charadon is the capital world of the largest and longest-standing Ork empire, ruled by the tyrannical Ork Warlord Snagrod the Arch-Arsonist, a particularly vicious and sadistic leader of a race noted for its generally vicious and sadistic tendencies.Chemos - The former homeworld of the Emperor's Children Traitor Legion and the Daemon Primarch Fulgrim.Dreadhaven - An Artificial World that contributes soldiers to the Astra Militarum.Eye of Damocles - The Eye of Damocles is a watch fortress of the Deathwatch. This watch fortress monitors the borders of Imperial space with the T'au Empire. Its kill-teams specialise in vertical assault from attack craft like the Corvus Blackstar.Fort Pykman - Fort Pykman is a watch fortress of the Deathwatch. Located in the Ghoul Stars, the watch fortress defends against Barghesi and Necron threats. The Deathwatch Astartes of Fort Pykman favour the tactics of the Ordo Malleus, demolishing ancient ruins and other sites at even the slightest hint of xenos activity.Golgotha - Golgotha is an Ork world, conquered and infested by the Greenskin forces under the command of Ghazghkull Mag Uruk Thraka after the Second War for Armageddon.Gorkamorka - Gorkamorka was once an Imperial world known as Angelis. Without warning, a fiery Space Hulk plummeted onto this parched, dead world from the depths of space, its immense impact took just an instant to all but wipe the presence of Mankind from the face of the planet. A pall of radiation and dust was cast over the world that would not settle for an entire decade. Soon the planet's climate and photography was irrevocably shattered and remade in a new and even harsher image. This massive vessel was not uninhabited, as it was occupied by the remnants of a massive Ork WAAAGH! which emerged from the ashes and rebuilt the harsh world in their own brutish image.Kar Duniash - Kar Duniash is the Segmentum Fortress of the Segmentum Ultima as well as the headquarters for the Imperial Navy's massive Battlefeet Ultima. It is also the site of a major Imperial orbital shipyard which is the primary fabricator of the Dominator-class Cruiser.Macragge - Homeworld of the Ultramarines Chapter and capital of the Realm of Ultramar.Mandragora - Located along the Eastern Fringe, Mandragora is a Necron Tomb World and crownworld of the Sautekh Dynasty. In ancient times, when the War in Heaven ended, the stasis-crypts of Mandragora were filled to capacity with some of the finest Necron warriors. Since their reawakening from their eons-long slumber, the world of Mandragora has once again become a hub of Necron activity. The Necron Overlord Phaeron Imotekh has dispatched Necron legions to the occupied regions surrounding the Tomb World against Ork Warboss Snagratoof and his Greenskin army.Metalica - A major Forge World of the Imperium of Man.Mu'gulath Bay - Mu'gulath Bay is known as the gateway to the Dovar System, and became a key strategic point for further T'au expansion into Imperial territory. Previously an Imperial Hive World known as Agrellan, the planet was captured by Commander Shadowsun and Ethereal Supreme Aun'va during the Third Sphere Expansion. During the ensuing Battle of Mu'gulath Bay, Tau XV104 Battlesuits proved decisive in defeating the Astra Militarum heavy tanks which guarded the world's capital hive city. The battle to capture the planet was the largest of the Third Sphere Expansion. Shortly after the Prefectia Campaign the Imperium launched a major counterattack against Mu'gulath Bay, determined to reclaim it. In the end the T'au managed to resist, but the Imperium subjected the planet to Exterminatus and destroyed it. Elements of Mu'gulath Bay's T'au population managed to survive thanks to a shield erected by the Earth Caste. The esoteric weapons of the Adeptus Mechanicus proved far more formidable than originally thought by the T'au, however. Mu'gulath Bay had to be abandoned as the entire Damocles Gulf was set ablaze, separating the territory of the Imperium from the T'au Empire. Surviving elements from Mu'gulath Bay attempted to flee to the Farsight Enclaves, but were set upon by Commander Surestrike at the order of the Ethereals. Surestrike managed to destroy most of the rebel T'au, but some managed to escape.Mundus Planus (Chogoris) - Feudal World of savage horse nomads who maintain little advanced Imperial technology. Homeworld of the White Scars Space Marine Chapter.Nocturne - This dual-classed Feudal World / Death World is the Chapter homeworld of the Salamanders Space Marine Chapter.Nuceria - The former homeworld of the World Eaters Traitor Legion's Daemon Primarch Angron. The world's population was wiped out during the battles of the Horus Heresy.Ohmn-Mat - Once a Forge World of the Adeptus Mechanicus, the burning grave of Ohmn-Mat is a well-known sight within the Ultima Segmentum. The Forge World descended into civil war at the outbreak of the Horus Heresy, and both factions were reinforced by contingents of Legiones Astartes before the war escalated and led one or both factions to ignite Ohmn-Mat’s atmosphere. All forge-fanes where destroyed by secondary atomantic explosions, further shrouding the planet in fire. The fires still rage to this day.Olympia - The former homeworld of the Iron Warriors Traitor Legion and their Primarch Perturabo.Orask - At the very edge of the Iquathan Deeps in the northern Ultima Segmentum, near the border of the Ghoul Stars, sits the Sentinel World of Orask. In recent times, a terrible assault occurred in 977.M41, when a splinter of the Eastern Hive Fleets of the Tyranid menace appeared, disoriented and twisted by its passage through the Ghoul Stars, and fell on the Orask System like a ravenous beast. A great battle ensued, that proved brief but bloody. The stoic defenders of Orask were backed by a full company of the Red Talons Space Marine Chapter and a Titan maniple from the Legio Magna. Despite horrific casualties in the tens of thousands sustained within a matter of mere days, the valiant defenders were able to push back their monstrous attackers. Eventually they contained the threat and purged the vile xenos from Orask's blasted surface. Evidence persists that some harbinger organisms escaped to the outer systems.Pavonis - A troubled industrialised Hive World located on the Eastern Fringe. The Ultramarines 4th Company under the command of Captain Uriel Ventris was sent to quell the troubles caused by humans and xenos alike. A secret, heretical organisation, known as the Church of the Ancient Ways, plagued the planet with random bombs planted around the various manufactorums. In addition, the world was also continuously raided by Dark Eldar corsairs over the course of six years. Uriel Ventris was successful in defeating both the civil insurrection as well as crushing the Dark Eldar and their human collaborator in the hidden tomb of the C'tan Shard known as the Nightbringer. Unfortunately, this vile entity escaped the confines of its tomb and fled into the galaxy at large. After completing a Death Oath and being cleared of taint, Uriel Ventris was reinstated as the commander of the 4th Company. He was then given the opportunity to prove himself in the eyes of those who still doubted him by returning to the world of Pavonis and defending it from T'au invaders.Prefectia - Prefectia was the site of the Prefectia Campaign fought between the T'au Empire and the Imperium.Prometheus - Large moon which orbits the Death World of Nocturne and serves as the location for the fortress-monastery of the Salamanders Space Marine Chapter.Prospero - The former homeworld of the Thousand Sons Traitor Legion and the Daemon Primarch Magnus the Red. The current homeworld of the Thousand Sons, Sortiarius, the Planet of the Sorcerers, now orbits above the remains of Prospero as the result of a great ritual enacted by Magnus the Red just before the opening of the Great Rift and powered by the deaths incurred during the Siege of the Fenris System in 999.M41.Pythos - Pythos is an Imperial Death World, covered mainly in dense jungles, with occasional areas of scorched grassland. Its jungles and oceans are inhabited by massive saurian predators. Because of the dangers of moving through the lowlands and across the oceans, the human settlers of Pythos settled in mountaintop mining colonies. From these, they derived a precarious and meagre existence mining the precious minerals found in the planet's mountain chains. Hundreds of these strongholds were scattered over the planet, each home to populations of only a few thousand Imperial citizens. Pythos' only major city is the Hive-port of Atika, located on the coast of the planet's largest ocean, and surrounded on its landward side by the aptly-named "deathglades." Atika was a small spire city with its main habitation zones located in its dome-like upper levels, high above the surrounding swamplands. Travel between Atika and the delver-strongholds was carried out in dilapidated lighter-than-air dirigibles known as "sky barges," lumbering through the skies high above the ferocious creatures that inhabited the lowlands in relative safety. It was a major source of the fighting during the Pandorax Campaign and was home to the prison for daemons known as the Damnation Cache.Radnar - An Imperial hive-world near Ichar IV. Infested with Tyranids during the Hive Fleet Kraken incursion, an Imperial Guard Emperor's Shield Regiment used its Armoured Company to destroy them and their nests around Jourmall Hive.Rynn's World - The homeworld of the famed Crimson Fists Space Marine Chapter.Ryza - An important Imperial Forge World.Sotha - Sotha was the homeworld of the Scythes of the Emperor Space Marine Chapter. Although once part of Ultramar, by the 41st Millennium Sotha was the cardinal world of the Sotharan League which included many other planets in the local region. Sotha was destroyed by Hive Fleet Leviathan during the Second Tyrannic War.Stygies VIII - An important Imperial Forge World.T'au - Located to the galactic north of Ultramar, T'au is the racial homeworld and capital of the T'au Empire.Talasa Prime - A Fortress World located along the Eastern Fringe of the Ultima Segmentum, this world is the domain of the Inquisition's Ordo Xenos. Talasa Prime is notable for housing the headquarters of the xenos hunting Deathwatch Space Marine Chapter within a massive Inquisitorial fortress, where they recruit, train and equip those selected Space Marines who join the elite Deathwatch in the art of xenos hunting.Tarsis Ultra - Tarsis Ultra is an Imperial Dead World that was formally a Civilised World. It was unique, in that it also possessed certain features of a classic Agri-World, since it was able to produce food for other Imperial worlds within the Ultima Segmentum. Despite its status as a major exporter of food, the planet suffered from long, harsh winters that gave it the appearance of an Ice World. The world was the site of a great battle between the Ultramarines Space Marine Chapter and the Tyranids of Hive Fleet Leviathan in 999.M41. This conflict left a terrible mark upon the world, but a worse fate befall Tarsis Ultra when it was finally transformed into an uninhabitable Dead World by the actions of the Iron Warriors Warsmith Honsou, who unleashed a terrible biological weapon known as the Heraclitus Virus into Tarsis Ultra's Tyranid-altered biosphere.Triplex Phall - A bustling major Forge World of the Imperium and the homeworld of the Legio Victorum.Valhalla - Frigid Ice World and home to the famed Imperial Guard regiments of the Valhallan Ice Warriors.