Segmentum Tempestus - Imperial Worlds: Amarah Prime - Former capital world of the Orpheus Sector, now left abandoned in the wake of the Orphean War.Bakka - Bakka is the home of the Segmentum Fortress for the Segmentum Tempestus, the primary Imperial Navy orbital fleet base for the mighty Battlefleet Tempestus which co-ordinates all naval forces in the segmentum and despatches starships where needed.Banelund XI - Imperial colony world that was attacked by Drukhari raiders, slaying all 1,200 colonists. Site of an Eldar Warp Gate artefact.Chamos - The world lies 10 light years from Tallarn. A rebellion led by Duke Mormant in the 35th Millenium occurred on Chamos.Danubis - A Dead World. Visited by the Adeptus Mechanicus Explorator vessel Lux Imperator, which disappeared and was later found in the Polonis Nebula bereft of its crew. Danubis is now recognised as a possible Necron Tomb World.Drachus - On this Hive World, von Castellan swindled Guilders.Epsion Octarius - Catachan Jungle Fighters and Konrar Imperial Guard Regiments fought on this Ork-controlled world. Its mangrove swamps are home to savage Crotalids and its mineral rich regions are home to ferro-beasts. The center ring of planets was lost to the predations of the Tyranid Hive Fleet Leviathan.Forsarr - The Hive World of Forsarr is the capital of the Forsarr-Sector, recently invaded by the Orks of WAAAGH! Garaghak.Geratomro - In 389.M41, this once-loyal Industrial World was the theatre of the Geratomran Reconquest, a brief but savage military campaign which saw the forces of the Imperium narrowly avoid a full-fledged daemonic incursion.Gryphonne IV - This was a Forge World and the home of the Titan Legio Gryphonicus. This forge world was recently lost to the attack of the Tyranid Hive Fleet Leviathan.Kiavahr - A Forge World near orbiting moon of Deliverance, homeworld of the Raven Guard Space Marine Chapter.Krieg (Death World) - Homeworld of the Death Korps of Krieg Imperial Guard Regiments.Kurzon's Fall - Kurzon's Fall is an Imperial Jungle World. Drukhari attacks upon its settlements prompted the cardinal of the neighboring Cardinal World of Sanctus Prima to call for a War of Faith against all aliens in the Orpheus Sector.Luther Macintyre IX - This arid Death World is notable for being the home of several deadly species of fauna, including Ambulls, Crawlers, Sunworms, and Micah Dragons. This world may also be a possible Necron Tomb World.Ophelia IV - This world is one of the oldest of the Cardinal Worlds, second in sanctity only to Terra itself. This Cardinal World was an alternate home to the Ecclesiarchy prior to the Age of Apostasy. The rich Convent Prioris of the Adepta Sororitas is located here.Ophelia VII - This densely populated world became the home of the Ecclesiarchy under the Ecclesiarch Benedin IV in 200.M35, and is home to the Convent Prioris of the Adepta Sororitas' Order of Our Martyred Lady. It is also the home to the Schola Progenium Seminaries where the Eccleisarchy priests and Sororitas Sisters who run the Imperium's orphanages are trained.Posul - This Feral World is shrouded in perpetual darkness and is the Chapter homeworld of the Mortifactors Space Marine Chapter.Pranagar - Chapter homeworld of the Sky Sentinels Chapter.Phobian - Chapter homeworld of the Dark Hunters Chapter.Raas Bisor - This is an Astra Militarum Foundry World.Rynn's World - Rynn's World is an Imperial Agri-world that is also the homeworld of the Crimson Fists Space Marines Chapter. It and the Rynnstar System of which it is a part were both named for the Imperial Reclamator Saldano Malverro Rynn who first led Imperial colonists to the system, reclaimed Rynnsworld for Mankind and settled it as another Imperial Agri-World. The planet is sparsely populated, mountainous, and devoted to intensive agriculture. Due to its distance from other Imperial worlds and its proximity to Ork-controlled space, it is somewhat isolated from the rest of Imperium, with the closest neighbouring human planet being Badlanding. The Crimson Fists' Fortress-Monastery Arx Tyrannus has stood on Rynn's World for over a thousand years since their great Battle-Barge Rutilus Tyrannus was dismantled to build it after the Crimson Fists were granted Rynn's World as their fief and ceased being a Fleet-based Chapter in 740.M40. Though serving as the Chapter's homeworld, Rynn's World is not owned as a Chapter fief by the Crimson Fists, and has its own Planetary Governor. Before a devastating invasion by Orks, the planet was protected by a formidable missile defence system, designed to deter invaders and a relatively skilled Planetary Defence Force called the Rynnsguard. Unfortunately, Rynn's World is not so far from the Ork Empire of Charadon. As the Ork empire grew, Rynn's World began to present a tempting target to Charadon's ruler, Snagrod the Arch-Arsonist. The planet was finally invaded in 989.M41 by Charadonian Orks under the orders of Snagrod. In a freak accident, the Crimson Fists' fortress-monastery was destroyed in the initial invasion by one of the Chapter's own defence missiles that went rogue and the Chapter was all but wiped out. Without the protection of the Crimson Fists, the humans of Rynn's World were quickly slain, and their settlements, with the exception of New Rynn City, the planet's capital, were completely overrun. Rynn's World was eventually liberated by the Imperium, although it took years of fighting to reconquer the worlds in Loki Sector under Ork domination.Targis VIII - This Hive World is locked in perpetual night and lies on the fringes of the Halo Stars in the galactic south. A large WAAAGH! of several Ork Warlords were defeated here by the Astartes of the Raven Guard. Notable Shadow Captain Kayvaan Shrike first rose to prominence for his actions during this Imperial campaign.Tarsis Ultra - This planet was assaulted by the Tyranids, but the Ultramarines, assisted by Captain Brannon of the Deathwatch, fought them off.Solstice - This world is notable for the victory of the inspirational Imperial missionary Uriah Jacobus over a cult of Genestealers. Jacobus was notable for converting a number of worlds in a remote area of the galaxy. He earned a reputation for facing the worst odds and still emerging victorious.Tallarn - This Desert World which circles two orange suns was fertile until it was virus-bombed by the Iron Warriors during the Horus Heresy, but is now covered with sulpherous sand, with its inhabitants living in domed cities or underground caverns. At the Ka'an Salient during the Iron Warriors' invasion, 50,000 tanks clashed in largest tank battle on record in Imperial history. Tall vapor-trap towers rise over the settlements. Human discovery of the Warp Gate known as the Cursus of Alganar brought on an Eldar attack before the Warp Gate could be opened to a Chaos horde. The humans of Tallarn and the Eldar united against the common foe and resealed the Cursus, locking away its daemonic protectors. The Imperial Guard's Desert Raiders regiments fought the forces of Slaanesh at the site of the Cursus as did the Titans of the Legio Mortis.Tethrock Quay - Imperial Naval Outpost. There are reliable reports of increasing Necron activity in this region of the segmentum.Volistad - Volistad is a Human-settled world that was first colonised by the Imperium in 979.M35. However, the history of Volistad at this point is unknown. Warp Storms isolated the planet while still in its sociological infancy, and it was left to develop on its own for the next 3,500 Terran years. Volistad was only re-discovered by the Imperium in 437.M39.