Genestealer Cult - Prior to Formal Imperial Classification, ca. M40: The Pyropurge (Unknown Date.M40) - The Pyropurge of Jauseth Septima is thought to be exhaustive. Using psychic means, the Puritan Inquisitor Dethrec Balthagar and his Deathwatch allies root out every last trace of Genestealer infection on the planet. However, a fourth generation cultist with the germ-seed of the alien left the infected world three solar weeks earlier aboard a cryopod shuttle, and he later returns to his home planet. Within three Terran years of Inquisitor Balthagar's death in service, Jauseth Septima is overrun once more.The Infested (Unknown Date.M40) - The capital world of New Gidlam falls to the Hivecult. The underworld brotherhoods first take over the lower portions of each teeming hive city, then infect the Imperial aristocracy that live a privileged life in the spires above. The gangs that have carved out territory in the lower levels fight to the last bullet, uniting as one in the face of the greater alien threat, but are eventually overcome. New Gidlam's principal human exports -- skilled roachworm silkers and recruits for the Astra Militarum -- spread the infection of the Hivecult from the outworlds of the Imperial domain and into its heartlands. Before the solar decade is out, the largest Hive World in the Segmentum Solar is assailed by the burgeoning Genestealer Cult, and the cycle of war begins anew.Death In the Jungle (Unknown Date.M40) - Moraz III, a Death World swathed in carnivorous jungle flora, is struck by the wreckage of a Rogue Trader's menagerie-ship. The Genestealer that breaks free from the ship's hold infects the local populace, giving rise to the nascent Cult Veridian. However, every human and hybrid member of the dynasty is killed when a regiment of Catachan Jungle Fighters uses Moraz III as a training world for their hunt-and-slay tactics. Only the Genestealers escape. Once the Catachans have left the planet, the xenos emerge once more, swiftly becoming the alpha predator of the jungle and reclaiming Moraz III for themselves before beginning the cycle anew.The Last Hierarch of Evergrind (Unknown Date.M40) - Robbed of both its Genestealer Patriarch and Magus after a pinpoint strike by the Imperial Navy, the Cult of the Star Saviours misreads a week-long meteor shower as a sign of imminent salvation. Taking the shooting stars in the skies of Evergrind as confirmation that celestial rapture is close at hand, the self-proclaimed "Last Hierarch," Primus Adamant, puts into motion his plans of conquest. On the night of the grand insurrection, every breeder city and dust farm upon Evergrind's surface is lit by the fires of revolution as the cult insurgency rises to impressively destructive heights. The cult's ascendance is like a flame to dry tinder. Riots break out in every quadrant as the local citizens take the opportunity to loot, kill and burn, exacting revenge for endless Terran centuries of oppression by their taskmasters. During the fighting, Primus Adamant is slain by an entrenched heavy weapons team, and with his demise the cult loses much of its cohesion. By the time the new moon rises, the planet has devolved into a post-apocalyptic bedlam populated by warring tribes, lone scavengers and scuttling half-xenos predators. Those craft whose captains are foolish enough to make planetfall upon Evergrind are soon brought low and claimed by the leaderless and atavistic cult -- and the ships' passengers with them.A Doom Unstoppable (Unknown Date.M40) - A strike force of Black Guardians from Craftworld Ulthwé descends upon the gyroscopic space station of Delugen. The prophetic Farseer Anathroelle Starseeker leads her warriors into Delugen's corridors. There they slay the Cult Tendricul in the most thorough fashion, putting every human they find to the sword. The station's astropathic distress signal reaches a Black Templars fleet, and whilst the Asuryani are rooting the last of the humans from the station's corridors, the Boarding Torpedoes of the Space Marines strike home. The Ulthwé force is driven off, and the last few survivors of Delugen escape. Within a standard year, the symbols of the Cult Tendricul are seen on a dozen planets, including the Aeldari Maiden World Virgose.