Velk'Han - Notable Sept Worlds: Ag'Ni - Originally seen by the T'au Empire as a world perfectly suited to settlement, this was not to be the case. Ag'Ni is home to aggressive microbial life forms that are devoted to repelling any and all off-world presence, as was the case with the unfortunate T'au colonists. The Earth Caste has now devoted their technology and time to terraforming Ag'Ni for a chance at a more hospitable environment. In the meantime, Fire Caste commanders have used Ag'Ni as a testing ground for powerful experimental weapons.Amenophis IVEa - Ea is a sort of "T'au Pleasure World" used by the Ethereal Caste as a place of meditation, retirement, and relaxation. The planet is composed of tiny islands fixed atop a vividly colored violet sea. When the T'au discovered that mankind had never set foot on this paradise, they quickly colonised it.Highlock IV - High gravity and plains of ice and snow have produced a hairy, large race of Abhumans not too dissimilar from the massive Ogryns. The population of Highlock IV have since been used by the T'au Fire Caste as skilled, dedicated shock troops known as the Highlock Freemen who are often used to break open entrenched enemy infantry formations.Innana - Desirable minerals and ores are beneath the surface of this coveted, Human-settled world. Upon being encountered by the growing T'au Empire, the native Humans were offered two choices: to serve as a labour force in their homeworld's new mines or be transferred off-world to other areas of the Velk'Han Sept. The Humans agreed to leave Innana, and the planet's resources are being used by the T'au to repel the Imperial presence on the Greyhell Front.Iphigenia - Seven billion Humans have made their home on Iphingenia, living in relatively advanced, Iron Age barbaric tribes. The tribes are somewhat feudal in structure, each led by a tribal king, who are in turn ruled by a high king. However, this high king pays fealty to the T'au who are referred to as the "Grey Kings." Every so often, the high king sends the most technologically adept of the population to the T'au living in orbit on void stations as a sort of tithe. The T'au reeducate them, and these Humans are eventually assigned to Earth and Air Caste work teams.Jaya - Naturally abundant in resources, Humans had colonised this planet many standard millennia ago forming a culturally and technologically advanced society. The "Jayans" had gone through the Jericho Reach's "Age of Shadow" with little incident, but their homeworld was seen by the T'au as a perfect planet for colonisation. The initial diplomacy went well, but Jaya's Humans ultimately resisted the attempt at incorporation in the T'au Empire with war once they realised the T'au wished to annex their world. Six solar months after the outbreak of hostilities, the T'au had more or less subdued the Humans and integrated them as reluctant Gue'vesa allies. Solar decades later after more or less stable T'au rule, Hive Fleet Dagon encroached upon the Velk'han Sept and made their way to Jaya. Infection by the hive fleet's Genestealer outriders among isolated pockets of Humans did occur, but the T'au were luckily able to "rec-code" them to prevent mental and genetic corruption.Justertii - Justertii is a barren world found within the portion of the Jericho Reach under T'au control. Lying in the otherwise starless depths trailing the Black Reef, Justertii represents an undiscovered enigma. Once an Aeldari "Maiden World" -- a planet seeded long ago by the Aeldari for future settlement -- Justertii is now a desolate waste studded with the blasted remains of Aeldari wraithbone structures. None can tell what fate befell the world and caused it to become a rogue far from whatever star must have birthed it. To date, both Imperial and T'au scouts have logged the existence of the world, yet it appears to be subject to some unfathomable process that causes it to vanish from the void and to reappear elsewhere.Krrk'tikit - Initially dismissed as a barren, featureless rock by T'au observers, the Vespid would beg to disagree. Upon traversing underground, the insectoid aliens discovered massive, crystal-filled caves. After this discovery, the T'au were more or less happy to give this world to their allies. The Vespid proceeded to build massive hives beneath the featureless surface of the planet.Tsua'Malor - The capital world of the Velk'han Sept and a source of pride for the Earth Caste, Tsua'Malor is the headquarters of the Mal'caor Shi. Originally Tsua'Malor was settled by Humans, but the Earth Caste has since transformed it into a "shining example of civilisation and enlightenment."Va'Jiya - A Feral World covered in jungles, swamps, and dark forests, Va'Jiya has a peculiar ecosystem. Va'Jiya's plant life rapidly blooms and grows during the day, but quickly rots and deteriorates after nightfall. A Human population present on the world long ago collapsed into tribal warfare in which the now-primitive tribes ceaselessly raid each other.Vallia - Vallia is an uninhabitable Death World sharing a peculiar ecosystem with its "sister planet" Va'Jiya. However, in the case of Vallia, every plant, animal, and microbial life form is connected by a massive, hostile gestalt intelligence utterly devoted to preventing alien, off-world colonisation.Zurcon - The Humans who long ago settled the Civilised World of Zurcon were once held in high regard by the Imperium of Man. Zurcon weathered the the Jericho Reach's Age of Shadow mostly intact, but became a prime target of the T'au Empire's drive for conquest after its expansion into the Jericho Reach. Infiltration of the world's Human ruling class by Gue'vesa agents has succeeded and now the T'au direct Zurcon's elite to unknowingly wage war against their former masters in the Achilus Crusade.