T'au Empire - Other T'au Worlds and Settlements: Since the T'au first left the atmosphere of their birth world, their empire has grown, spreading across the stars in three distinct phases known as "Spheres of Expansion."In addition to the settled star systems, or septs, the T'au realm is rife with all manner of spatial phenomenon, T'au-made orbital structures, fortress stations, orbital cities, lesser void stations and important alien homeworlds. There are also more sparsely populated T'au colonies that are not accepted into the empire as full septs. Only a few names of such T'au colonies are known to the Imperium:Arkunasha - The planet of Arkunasha was settled during the Second Sphere Expansion. Despite the aridity of the oxide deserts that made up the world's surface, the T'au had settled the red planet with a sizeable population. This they had achieved through the tireless work of the Earth Caste's scientists and engineers. By their efforts, the T'au Empire had girded the planet with two necklace-like strings of biodomes that ran around the most temperate latitudes, each a mirror distance from the equator. From orbit, the world appeared as a blood red globe adrift in the ocean of space, banded with two rows of bioluminescent lights that pulsed bluish white like the flanks of some deep-sea organism. In their preliminary investigations, during the earliest expeditions to Arkunasha's surface, the Earth Caste had made a disturbing discovery. Whilst determining the source of the oxide deserts that covered the world, they found a great variance in the metallic composition and even origin of the various particulates. It was as if the world had been entirely covered in metal structures at some time in the distant past, which had long since been utterly ground to dust. Given the depth of the oxide residue, that ancient civilisation must have included several artificial cities the size of mountain ranges. Theories abounded throughout the Earth Caste about the planet-wide catastrophe that had torn everything upon the planet's surface apart. Though the T'au had no idea what might have caused Arkunasha's spectacular death, or who the inhabitants might have been, they had taken their first glimpse of the world-destroying power of the Imperium's Exterminatus actions.Dal'yth - Before the coming of the T'au, the indigo planet of Dal'yth was a wild ecosystem of deep blue foliage and slithering, segmented beasts. It was tamed long ago, during the First Sphere Expansion, and has been brought into compliance with prime-level colony standards ever since. Because of the high proportion of Water Caste members upon its surface, Dal'yth has enjoyed extremely beneficial trade agreements, and has recently been counted as one of the Nineteen Wonders of the T'au Empire. Much of the planet's surface is covered with a tessellating hexagonal net of cities and sub-cities, each connected to the nearest conurbations by a splaying and perfectly regular network of transit tubeways. Clean, white magnorail trains whisk the populace to and fro, detaching and picking up carriages with slingshot efficiency so that they never have to stop. Though the planet has landscaped hills and even gigantic hexagonal reservoirs dotted across it, from orbit, it looks as if the T'au have settled it with the precision of an Earth Caste scientist modelling a new atomic phenomenon.Es'Tau - Es'Tau was settled during the Second Sphere Expansion.Ho'sarn - The T'au colony of Ho'sarn was evacuated in 902.M41 as Hive Fleet Gorgon approached, but the evacuation fleet was ambushed by the hive fleet's bioships and completely slaughtered.Isla'su - Isla'su is the watery homeworld of the Greet, often considered part of the Fal'shia Sept.Ka'mais - Ka'mais was invaded by the Tyranids' Hive Fleet Gorgon in 902.M41. A hidden Necron fleet emerged from Ka'mais' dead moon and destroyed the outnumbered Tyranid bioships, but then continued to land on Ka'mais and eradicate the planet's population to retake the world for the Necrons' own.Kor'vattra (T'au Protection Fleet) and Kor'shuto (Orbital Cities) - Incorporated into every sept are dozens of major docks for the T'au Protection Fleet (Kor'vattra), but in addition to these immense void stations, many septs have also developed vast orbital cities (Kor'shuto). These can be moved to provide stable "jumping off" points for large T'au research endeavours, military campaigns or major colonisation efforts.Me'lekRed Sun Systems - T'au probes have marked the dense cluster of planets around a string of six distinct red suns; however, the massive Ork population has deterred any further T'au colonisation of the region. The star systems are ringed with T'au sensor buoys, in hopes of offering early warning should the Greenskins ever cease their internal fighting and seek to menace neighbouring systems.Sha'draig - Sha'draig was invaded by the Tyranids of Hive Fleet Gorgon in 900.M41. The Tyranids were eventually driven off the world, but not before it was almost completely consumed by Ripper swarms.T'ros - T'ros was recently settled during the Third Sphere Expansion. This was an Imperial world that was willingly annexed by the T'au after opening commercial relations with the xenos empire. The resulting Imperial attempt to retake the world was defeated by the T'au during what became known as the Taros Campaign.Ta'shiro (Fortress Stations) - Positioned in the deep space between septs are T'au Ta'shiro bases -- fortress stations capable of enough thrust to resist gravitic drift and maintain permanent interstellar positions. Several patterns of development have been followed in the construction of these enormous floating fortresses -- with the largest comparable in population to a continent-sized city.Zone of Silence - A devastated region where Hive Fleet Gorgon left behind many barren planets scoured of all life forms.