Adeptus Mechanicus - M41-M42 The Time of Ending and Era Indomitus: As the galaxy darkens, new threats arise all across it.The Exhubris Portal (029.M41) - The rune-sealed portals upon the world of Exhubris II's grand archipelago are hidden within a landscape of leech-infested pyramids, but the Stygian Cult Mechanicus makes it their mission to open them. The excavation is well under way when a large force of Eldar from Craftworld Ulthwé arrive without warning to assail the Cult Mechanicus work teams. Stygies VIII requests aid from a nearby Martian fleet. So determined is their defence that the reinforcements have time to make planetfall in great number, and the Eldar ground forces are hammered to ruin. The runic portal is broken open, and Tech-priests from both Stygies and Mars enter the lambent labyrinth beyond.Gothic War (139-160.M41) - The Gothic War, also called the 12th Black Crusade, was a vast military campaign against the Imperium of Man launched by the Warmaster of Chaos Abaddon the Despoiler of the Black Legion in 139.M41 which lasted until 160.M41. The conflict consisted of hundreds of planetary invasions and naval battles within the Gothic Sector and only ended when Abaddon was forced to retreat to the Immaterium with the arrival of Imperial reinforcements. It saw the destruction of several planets and four of the six known Blackstone Fortresses, as well as the deaths of billions of Imperial citizens.The Baited Beast (173.M41) - The Cult Mechanicus deliberately triggers WAAAGH! Kragga in the tightly-held Urdeshi System. Though the WAAAGH! boils out of control planetside, the Imperial Navy keeps it contained to Urdesh and its neighbouring worlds. The Tech-priests greedily harness every screed of information; so much data is gathered their overheating archives have to be relocated to the cool of Urdesh’s underground catacombs. Eventually the greenskins are methodically exterminated clan by clan. The next three centuries are spent cleansing and rebuilding the Urdeshi System. In the process, the invaluable data-catacombs are filled with rockcrete to form foundations for a grenade manufactorum.The Macharian Conquests (392-399.M41) - Led by Mars, Graia and Gryphonne IV, many Forge Worlds send armies to aid the massive crusade of Lord Commander Solar Macharius, the Imperium's greatest Astra Militarum commander of all time and a recognised tactical and strategic genius on a par with the primarchs themselves. This Imperial Crusade took place on the far western edge of the galaxy within the Segmentum Pacificus, reaching as far as the border of the galaxy with intergalactic space and even reaching into the unknown regions of the Halo Zone. The furthest extent of this crusade reached just beyond the edge of the Segmentum Pacificus, where not even the blessed light of the Astronomican could penetrate the dark void.The Death of Tyran (745.M41) - A terrible new foe looms from the void. On the far reaches of the Eastern Fringe, the Adeptus Mechanicus research station of Tyran Primus comes under attack. Despite a stalwart defence by Skitarii cohorts and an entire regiment of Astra Militarum, the planet is conquered and its biomass devoured. Magos Varnak compiles a data-codex that reveals the dread truth of the planet's last few solar hours and fires it into space before triggering the outpost's runes of ending. The Tyranids enter the galaxy.Rain of Fire (Unknown Date.M41) - After the Battle of Macragge, a splinter fleet of Hive Fleet Behemoth winds its way into the Skitarii-held Daugel Helix. Using the knowledge recovered from the Tyran data-codex, the Skitarii fight back. The cohort commander Alpha 9-Thyrrc tuns the tide by saturating a stratum of the atmosphere with gas from the planet's Promethium refineries. After his Onager Dunecrawlers' neutron lasers set the skies aflame, each new rain of Tyranid Mycetic Spores incinerates those xenos planetside instead of reinforcing them. A triumphalist data-codex is compiled and sent to the nearby Forge World of Accatran, where it is swiftly filed away in the Archive Anomalis and forgotten.The War of Neotech (Unknown Date.M41) - The T'au settlers of Vesh'yo find themselves fighting for their lives against three Skitarii Legions. The ancient weapons of the Adeptus Mechanicus are pitted against he clean, cutting-edge technology of the T'au Empire. Many additional Skitarii reinforcements are deployed before victory is finally secured. Six star freighters full of T'au war materiel find their way back to the Forge World of Tigrus.WAAAGH! Grax (Unknown Date.M41) - The brutal juggernaut of WAAAGH! Grax terrorises the star systems near Ryza. Legions of Skitarii counterattack alongside Catachans and liberated human slaves. Word of the intense fighting attracts WAAAGH! Rarguts, which breaks through the Imperial Navy cordon to invade Ryza for the third time since the conflict began. The fate of a string of Imperial star systems hinges upon the Forge World at their heart.The Curse Entropic (865.M41) - A Chaos Warfleet of Iron Warriors and Daemon Engines unleashes a destructive machine curse upon Cypra Mundi. Soon the Forge World runs with rivers of molten metal, its surface dotted with a million burnt-out machines. Just as all seems lost, the Cult Mechanicus coordinate a psalmic banishment that lifts the curse, leaving the Chaos Space Marines bereft of their daemon allies. The planet is cleansed within a solar week.The Caverns of Calth (979.M41) - Rumours circulate of a unique Tyranid bioform unearthed from the ice of Calth's polar crust. Magos Locard leads an Explorator army into the Realm of Ultramar, delving deep under the planet's cold skin within solar minutes of planetfall. The Torsion Cannons of hundreds of Battle Servitors grind a path towards unsanctioned life signs in Calth's ancient tunnel networks. They do not find the legendary Carnifex they were expecting, but nest upon nest of burrowing, serpentine horrors. A desperate subterranean battle breaks out in the darkness, and Magos Locard is forced to leave empty-handed.To Punish the Usurper (983.M41) - Upon the lodestone world of Knuthor, a nation of feral humans worships their Ork slavers as prophets of the primitive deity King Thug. When the nearby Forge World of Graia learns one of the Ork Roks is built around a fabled Ark Mechanicus, it sends forth its legions on a priority intercept. Within a standard year of the travesty coming to light, both xenos and human alike have been scoured from the planet, and the salvaged pieces of the Ark Mechanicus borne reverently back to Graia.The Unknowable (Unknown Date.M41) - Skitarii from Stygies VIII are sent to the diluvian-class world of Magogue when the planet's industry dries up its oceans to reveal Necrontyr architecture. The Skitarii fight valiantly against the Necrons of the awakening tomb complexes, allowing the planet's islander people to evacuate. Only the commanding Tech-priests, hunting for knowledge behind the lines, escape the ensuing carnage. However, in doing so they clash with Trazyn the Infinite. One by one the Tech-priests are collected in stasis fields and displayed as part of a monument to Magogue's fall.The Omnitask Blashemy (988.M41)Scouring of Johan's Eden (992.M41) - An ancient data-cache is unearthed upon the Jungle World of Johan's Eden. The Cult Mechanicus descends, only to find the planet's modest populace slain by Necron Canoptek constructs. Several Mechanicus war congregations launch a simultaneous attack. Eight standard years of war follow before the Cult Mechanicus recovers the data-cache. Three intact STC database files are recovered as a result -- one for self-heating cookpots, one for parchment autoquills, and one for stable flux-core bolt rounds that can melt ceramite as if it were wax.Tyrannic Wars (992.M41 and 997-999.M41) - The Tyranid invasion wreaks havoc across scores of Forge Worlds, with several, including the powerhouse of Gryphonne IV, utterly destroyed by the ravenous xenos.Return to Abheilüng (674.999.M41)Ultimate Power (ca. 900s.M41) - Clues to the location of the Omnicopaeia are uncovered upon Hell's Teeth, a Daemon World on the edge of the Maelstrom. The Omnicopaeia, an arcane device that contains every STC with a psychic component, is of immeasurable value. Many billions of Skitarii are dispatched to Hell's Teeth with all haste. The entire Adeptus Mechanicus across every Forge World takes notice -- should the legendary Omnicopaeia be found, they will finally have a way to control, precipitate and even weaponise Humanity's psychic dawn.Desperate Measures (986.999.M41) - The Tech-priest custodians at work in the Imperial Palace uncover irrevocable failures in the mechanisms of the Golden Throne. A dozen contingency expeditions are immediately launched, including a Xanthite war procession of the Inquisition sent through the Exhubris Portal into the Webway. The Xanthites fight through Harlequin troupes and daemon hordes alike before reaching their intended destination. In the grave-cold oubliettes of the Haemonculi beneath the Dark Eldar city of Commorragh, a sinister bargain is struck...Fall of Cadia (995.999.M41) - The 13th Black Crusade devastates much of the Cadian Sector and spreads disaster across the whole of Segmentum Obscurus. Despite heroic fighting, Cadia falls. Many refugees from the numerous campaigns find temporary safety on the Forge Worlds of Agripinaa and Stygies VIII, where their numbers help repel the Chaos attacks that soon follow. The loss of dozens of Titans, fleets, robots, and entire armies is a devastating and irreplaceable blow. In the wake of the disaster, the High Lords of Terra themselves decree that all Forge Worlds are to increase production by any means necessary.A Primarch Awakens (ca. 999.M41) - In news that ripples across a galaxy riven by war and splintering with Warp disasters, the Ultramarines Primarch Roboute Guilliman is awakened. Although xenos are rumoured to be involved, the Adeptus Mechanicus claim sole responsibility for the deed that brings back the Avenging Son.Great Rift Opens (ca. 999.M41) - Warp Storms of a magnitude not seen since the Age of Strife wrack the galaxy. Every Forge World is cut off from its Explorator fleets and, for a time, from each other. All suffer invasions and raids as emboldened xenos and Chaos forces test them, probing for weaknesses, eager to destroy the bastions of Mankind's empire. No fewer than seven Forge Worlds are destroyed altogether and several more remain missing, buried beneath fierce and impenetrable storms.The Secrets of Cawl (ca. 999.M41) - Upon the orders of Primarch Roboute Guilliman, now the lord commander of the Imperium and the Imperial Regent, Archmagos Dominus Belisarius Cawl begins to unlock the secret vaults and awaken from stasis the many armies of the Primaris Project. An entire new Founding of Space Marines is born.Storm of Metal (ca. 999.M41) - All across the Imperium after the birth of the Great Rift, primary Mechanicus holdings -- from mining colonies to Knight Worlds to Forge Worlds -- found themselves under attack from Necrons. The massive influx of Chaos energies had triggered anti-Warp protocols in every Necron Tomb World, and things that had lain dormant for aeons stir once more. The infamous Technomandrites of Magistrakh, struck down by the ruling Necrontyr Silent King eons before, returned. Panic rose amongst the Tech-priests, for they were already besieged from without, and the Necron threat was coming from within.The Indomitus Crusade (ca. 999.M41-111.M42) - The initial blackness that blanketed the galaxy after the Great Rift was torn open finally lifts. In the aftermath of the Noctis Aeterna, many Imperial Crusades are launched. Although there were several successful campaigns, none could claim more triumphs than the Indomitus Crusade. From Terra, Roboute Guilliman mustered a coalition. In addition to Archmagos Belisarius Cawl, Mars sent many Skitarii Legions, maniples of the Legio Cybernetica and several lances of Knights from House Taranis. Over a dozen other Forge Worlds send supporting fleets as the expedition crosses the galaxy, and many Knight Worlds prove eager to join -- none more so than the vengeful House Krast. The Crusade's many victories bring a glimmer of hope to the darkened Imperium. However, once Guilliman leaves, returning to aid Ultramar during the Plague Wars, the remaining forces splinter, the campaign losing impetus as factions return to protect their own homeworlds.Duels Without Honour (Unknown Date.M42) - The fallen Knights of House Black, not seen since they escaped into the Eye of Terror during the Great Crusade, return. The fell Knights are seen across hundreds of battlefields, appearing as if from nowhere to ambush the forces of the Imperial Knights.War of Slime and Metal (Unknown Date.M42) - Metalica is besieged by the Plaguehosts of Nurgle, the 3rd and 7th Plague Companies of the Death Guard, Renegade Chaos Space Marines, the corrupted Titans of Legio Morbus, and no fewer than seven fallen Knight houses. Only the arrival of the entire House Raven staves off defeat, and only with the aid of a war fleet from Deimos is the attack finally broken and the daemons banished.The Adeptus Mechanicus Unleashed (Unknown Date.M42) - With the Imperium reeling from the disastrous effects of the Great Rift, Mars commands all Forge Worlds to ramp up production to unprecedented levels. They churn through raw materials and servitors as never before, and vast armadas are launched to strip entire star systems of resources. The forges must be fed at impossible rates in order to supply the endless war materiel required.Rust Fields War Begins (Unknown Date.M42) - To fuel their factories, a coalition of Forge Worlds led by Mars and Graia sends mining fleets to exploit the vast belt of asteroids known as the Rust Fields.Although its interior has never been explored, its exterior is incredibly rich in all manner of metals, minerals and promethium seas -- a tumbling horizon of asteroids that stretches across three sectors. Soon after operations are begun, however, it is discovered that Greenskin tribes rule the interior of the Rust Fields. So begins a great war that draws in untold numbers of additional Imperial forces as the Adeptus Mechanicus fights to retain its foothold.Bane of the Forge Worlds (Unknown Date.M42) - Although there are many theories, none understands the reason for the Necron attacks upon Forge World territories as well as Archmagos Belisarius Cawl. Both sides are seeking deposits of the strange material -- blackstone -- from which the Cadian Pylons were fashioned, and many Adeptus Mechanicus strongholds have been erected upon sites containing this precious resource. Cawl sends his own agents -- armies of Mars and House Taranis -- across the stars in an effort to combat the growing danger, and hundreds of battles are fought as more and more Forge Worlds are drawn into the conflict to aid their beleaguered brethren. Even those Tech-priests that begin to understand the reality of the dire situation are loath to call upon their Imperial allies for fear of being branded Hereteks.Plague Wars (ca. 111.M42) - At the urgent call of Roboute Guilliman, over a dozen Forge Worlds, including Mars, Ryza, Metalica, and Triplex Phall, send reinforcements to Ultramar. There they aid the Avenging Son's armies in defence and counterattack against Chaos Renegades and the Death Guard.