The Adeptus Mechanicus is the one Imperial Adepta that as the Cult Mechanicus actually predates the Imperium of Man itself, and was known originally as the Mechanicum of Mars. Though the Adeptus Mechanicus was formally integrated into the Imperium of Man by the Treaty of Mars (known as the Treaty of Olympus Mons to the Mechanicum) over 10,000 Terran years before the “present” of the 41st Millennium at the dawn of the Emperor’s Great Crusade to reunite Mankind in ca. 800.M30, it retains an unparalleled degree of autonomy from the rest of the Adeptus Terra for an Imperial Adepta.
This autonomy was guaranteed to the Mechanicus in the Treaty of Mars to provide the Tech-priests with immunity to the dictates of the atheistic Imperial Truth and to allow the Mechanicus to continue to exercise sovereignty over all of the Forge Worlds it had settled across the galaxy during the Age of Strife. In return, the Mechanicus agreed to aid in the construction of the massive fleets and the provision of the technical aid necessary for the Imperium of Man to launch the Great Crusade.
Whereas nearly all the citizens of the Imperium observe the tenets of one of the various sects of the Imperial Cult that worships the Emperor of Mankind as the God-Emperor, the Adeptus Mechanicus is virtually synonymous with the Cult Mechanicus, another faith that could easily be considered heretical by the rest of the Imperium if the Adeptus Mechanicus was not essential to the survival of the Imperium and if the Tech-priests had not proven their loyalty to the Emperor in countless ways.
The Adeptus Mechanicus is vitally important to humanity because the Imperium, despite its technologically advanced state, has a very limited scientific knowledge of how its technology actually functions. This has only reinforced the prevailing Imperial view that the building and use of advanced machinery is almost a magical or religious act, fraught with ritual and inviolable instructions.
The Adeptus Mechanicus, with its inherent understanding of the Machine Spirit and the Machine God, has a near-monopoly on Standard Template Construct (STC) designs and other advanced Imperial technological knowledge. As a result, the Mechanicus wields a tremendous amount of power in the Imperium as the primary manufacturer, maintainer and repairer of everything from basic farming equipment to interstellar warships.
The birthplace of the Adeptus Mechanicus was the ancient Forge World of Mars. Mars was colonised very early in human history, long before the start of even the Dark Age of Technology, and developed a society different from Terra both culturally and in terms of technological advancement. The arid, rusty surface of Mars was terraformed, and under a man-made oxygen-nitrogen atmosphere, the Martian colony flourished, though it remained politically independent from Terra. When the era of human interstellar colonisation began, both Terra and Mars served as the co-equal mother worlds of countless new human colonies across the galaxy.
During the Dark Age of Technology, the two empires of Terra and Mars co-existed under the aegis of the decentralised human interstellar government of that era, to the mutual benefit of both. At the height of its splendour during that era, and even later in the anarchic Age of Strife, Mars despatched hundreds of colony fleets into the void. Many perished in the terrible Warp Storms that engulfed the galaxy at that time before the birth of the Chaos God Slaanesh, but others survived or made their way forward at sublight speeds in realspace. Those who did founded new Forge Worlds in the name of the Machine God and built on them a likeness of the great manufactorums and temples of their distant homeworld. These Forge Worlds also forged new empires for the Mechanicus among the feudal Knight Worlds and added their unique combat walkers, the Knights, to the Mechanicus’ own powerful arsenal.
The onset of the Age of Strife brought an end to the glory and peace of the ancient interstellar human domain. Across the galaxy, Mankind suddenly turned upon itself as a new breed of Warp-attuned psykers emerged and Warp Storms engulfed the galaxy, rendering interstellar travel and communication dangerous to the point of impossibility. Civil war engulfed thousands of human worlds, even the twin human homeworlds of Terra and Mars.
Many warring factions vied for power on Mars and waged a brutal civil conflict using arcane and unimaginably destructive weaponry, including psychic abilities. The carefully constructed atmosphere of Mars was burned away, and once more the rusty surface of the planet was exposed to the deadly radiations of the Sun. The terraformed Martian environment, which had teemed with Terran life for centuries, was rendered a barren crimson desert again. The Martian combatants now fought in the same blood-hued wastelands that the first human colonists from Terra had found millennia before. Much of the Martian population retreated underground, as any who were not equipped with a radiation and life support suit could not long survive on the Red Planet’s harsh surface.
In time, one faction emerged dominant over all the others that had contended for dominion over Mars — the Cult of the Machine God, the Mechanicum. Believing deeply in a strange theology which held that the expression of the universe’s divinity, the Omnissiah, was embodied in advanced technology and machines, the Cult Mechanicum established its rule over the Red Planet and erected massive new manufactorums and hive cities across the world, divided into different city-states known as forges or forge cities. Each forge was ruled by a high-ranking Tech-priest, and the entirety of the Mechanicum’s hierarchy bowed to the high priest known as the Fabricator-General.
For millennia the Mechanicum ruled over Mars, sending out colony expeditions to spread its faith and its way of life across the galaxy, which led to the founding of the first Forge Worlds. Mars also made war upon the divided techno-barbarian states that ruled Terra at this time, as many of these ignorant savages had access to advanced technologies left over from the Age of Technology that they did not understand or know how to venerate properly. This innate hostility between Mars and Terra lasted for centuries until in the late 30th Millennium, following his victory in the Unification Wars on Terra, the Emperor of Mankind came to Mars and landed atop the great volcano of Olympus Mons.
At their first sight of the Master of Mankind many Tech-priests were overcome with the feeling that they had met the living embodiment of the Omnissiah, the Machine God clad in human form. In return for peace between Terra and Mars, the recognition of the Tech-priests’ right to practice their faith and their right to maintain control over both Mars and the other Forge Worlds they had settled, the Mechanicum agreed to build Imperial starships at Mars’ Ring of Iron orbital fleet yards and provide all of the war materiel necessary for the Emperor’s Great Crusade.
In addition, the Mechanicum agreed to be bound by the Emperor’s commandment to never develop certain forbidden technologies such as artificial intelligence, warp powered machinery. With the signing of this agreement, known as the Treaty of Mars or the Treaty of Olympus Mons within the Mechanicum, the Cult Mechanicum became the Adeptus Mechanicus of the new-forged Imperium of Man, and the Imperial Aquila was refashioned to bear two heads, one for Terra and one for Mars.
Yet the terms of this agreement did not sit well with some within the hierarchy of the Mechanicum. These Tech-priests particularly chafed at the end of Mars’ political independence and the imposition of the Emperor’s restrictions upon what technologies the Tech-priests of the Mechanicum could research and develop. As the Great Crusade progressed into the early 31st Millennium, these simmering discontents would ultimately cleave the Mechanicum just as it would the wider Imperium.
During the Horus Heresy many Mechanicum units declared for the Warmaster Horus and fought against those of their faith who remained loyal to the Emperor, becoming known in later times as the Dark Mechanicus. These Traitor Mechanicum units initiated a civil war on the Red Planet known as the Schism of Mars that mirrored the larger conflict raging across the galaxy. The Fabricator-General himself sided with the Warmaster, but his deputy, the Fabricator Locum Kane, remained loyal to the Emperor.
Horus swayed the Fabricator-General of the time, Kelbor-Hal, to the side of Chaos by promising him a complete STC database from the planet of Drakonis-Three-Eleven and brought the senior Tech-adept in his 63rd Expeditionary Fleet named Regulus over to his side with other STCs recovered from the Imperial conquest of the Auretian Technocracy. Horus promised much else in terms of technological knowledge to the Mechanicum, including the right to develop technologies like artificial intelligence previously forbidden by the Emperor in the Treaty of Mars in return for their allegiance to his cause.
Many Master Adepts like Kelbor-Hal longed to pursue these restricted lines of research and had long believed that the Emperor was not the Omnissiah of the Machine God, for the true Machine God dwelled in the Noctis Labyrinthus deep below the crust of Mars. That this legendary creature may actually have been the C’tan shard known as the Void Dragon is a disturbing possibility.
The Quest for Knowledge
Over the long millennia since its inception, the Cult Mechanicus has been riven, reformed, brought to the brink of catastrophe, and has engaged in conquests that span the galaxy. Calculus Logi labour night and day to catalogue its history, though they disclose it not. Only a handful of events are allowed to reach the annals of Imperial truth:
M15-M25 The Age of Technology
Although accounts of this era are incomplete and unreliable, it is generally considered to be a golden era of development and expansion as Mankind first spreads across the galaxy. The Warp-Drive, Navigators and Standard Template Construct (STC) technology herald this new era of discovery. The first of which will later become known as Forge and Knight Worlds are established during this period. Human psykers appear in ever-increasing numbers.
M25-M30 The Age of Strife
Mankind‘s collapse comes with terrifying swiftness. It is difficult to unravel the truth, but tales abound of anarchy, daemonic possessions, the coming of the Enslavers and the betrayal of humanity by the thinking machines. With the collapse of the Aeldari and birth of the new Chaos God Slaanesh, the galaxy is engulfed with Warp Storms that isolate swathes of the galaxy and those civilisations not destroyed outright are cut off from one another. Many come to know this era as “Old Night,” and it descends like a shroud over the galaxy. During this time, the Forge and Knight Worlds fare best, for they eschew psykers and purposefully regress technologically. They grow superstitious and hidebound in their own traditions while they stand alone in a galaxy besieged by evils.
- Mars Expands (M25-M30) – Mars overcomes strife and disaster to unite beneath the Cult Mechanicus. As lulls between the waves of Warp Storms allow, the fleets of Mars travel outwards, raiding for lost technology and establishing new colonies of Tech-adepts. With a few exceptions, such travels remain limited in scope and stay within the confines of what will later become known as the Segmentum Solar.
- The Treaty of Mars (ca. 798.M30) – The Emperor, fresh from uniting the tribes of Terra, arrives on Mars. Many of the Tech-priests declare him to be the Omnissiah, and so the Emperor forges an alliance with Mars. It is the Adepts of the Cult Mechanicus that equip the Emperor’s Space Marine Legions for the Great Crusade. In recognition of the fact that to achieve His galactic plans, the Emperor needs the technological and scientific aid of the Mechanicum, Mars becomes an ally to Terra rather than her subject, which is cemented by the signing of the Treaty of Olympus Mons, known as the Treaty of Mars on Terra. Of the countless worlds that the Imperium soon claims, only Forge Worlds dedicated to the Cult Mechanicus are esteemed in such a way.
M30-M31 Dawn of the Imperium
- The Great Crusade (798.M30-004.M31) – The Emperor leads the massive Great Crusade outwards from Terra, with the purpose of reuniting the hundreds of thousands of lost worlds scattered across the galaxy. At the fore are the Space Marine Legions, supported by the growing Imperial Army. All are equipped by the factories of Mars. No less important are the Skitarii Legions, the Legio Cybernetica, the Legio Titanicus, and the Imperial Knights that join the expedition. Planet after planet is reconquered and humans offered the same choice — bow before the Emperor of Terra or be destroyed. On and on the Expeditionary Fleets push outwards. The Tech-priests often refer to this time as the Great Expansion, for hundreds of Forge and Knight Worlds are rediscovered during this period alone.
- The Horus Heresy (005-014.M31) – Like all of the branches of the Imperium, the Mechanicum finds itself rife with corruption during the epic civil war known as the Horus Heresy. Many Forge Worlds and Knight Worlds turn from the Emperor. Indeed, the Fabricator-General of Mars, Kelbor-Hal himself, declares his allegiance to Horus, and so begins the Schism of Mars, a bitterly-fought campaign that mirrors those taking place across the galaxy. Skitarii Legions square off against each other while Titan duels Titan. Those of the Cult Mechanicus that turn to the Chaos Gods are forever after known as the Dark Mechanicum. They are hated and feared in equal measure, for they dare to fuse daemons with the Machine Spirits of their war engines, creating twisted things that mock the Machine God and His true laws of order and reason.
- The Birth of the Adeptus Mechanicus (012.M31) – A long-running political deadlock in the Council of Terra back on the throneworld of the Imperium is finally broken, facilitating the formal establishment of the Imperial Adeptus Mechanicus. The Adeptus Mechanicus is recognised as officially separate and distinct from the corrupted Mechanicum of Mars. Fabricator-General Zagreus Kane is appointed its first High Lord of Terra to serve on the council. Final judgement is enacted upon the captive followers of the Traitor Fabricator-General Kelbor-Hal, who are executed in their thousands. Immediately after, the union of Loyalist Titan Orders, under the umbrella of the Adeptus Titanicus or Collegia Titanica, is formed by the Grand Masters of several major Loyalist Titan Legions, although the future of other loyal former Mechanicum divisions such as the Legio Cybernetica and the regular military forces of the Taghmata remains unclear.
- The Great Scouring (014-021.M31) – Wars of recrimination follow the Horus Heresy. Led by Roboute Guilliman and the Ultramarines, the Imperial forces fight battle after battle, driving the remaining Traitor armies back until they finally flee, seeking refuge in the Eye of Terror. The Knight Houses, their honour tarnished by the vile deeds of fallen Knights, are especially vehement in their pursuit of battles of vengeance. Recognising the need for systemic change, Guilliman creates the Codex Astartes, and tasks Archmagos Dominus Belisarius Cawl with a secret task that will align the fates of the newly-forged Adeptus Mechanicus and the Space Marines for centuries to come.
M31-M32 Age of Rebirth
The Mechanicum of old is reforged as the Adeptus Mechanicus following Lord Commander of the Imperium Roboute Guilliman‘s Reformation of the Emperor‘s realm and the new Fabricator-General of Mars is given a permanent position as a High Lord of Terra. Crippled by His wounds during the final Heresy battles, the Emperor is interred within the Golden Throne, a device so complex that only the Adeptus Mechanicus can hope to maintain its systems.
- The Shadow War (Unknown Date.M31-Present) – An intense paranoia drives the Cult Mechanicus to bury their secrets deep. When the Inquisitors of Terra’s new order take their tithe of data-tapestries, they also unwittingly take the countermeasures that will unravel them. Aware of their mistake but unwilling to admit it, the Inquisition devises purge protocols that engage in an unseen battle with the self-replicating deletion-programs of the Cult Mechanicus. Though this shadow conflict flares up into several planet-wrecking wars before fading, battles between them still rage in secret to this day.
- The Giridium Experiment (011.M32) – The Cult Mechanicus builds a fortress around the “haunted” caves of Giridium. During the manifestation which occurs every equinox, the disciples of the Omnissiah blast apart rank upon rank of red-skinned daemons. The process is repeated for nine long standard years. Just as the Adeptus Mechanicus are compiling reports and preparing to withdraw, the sky above yawns wide and disgorges a rain of capering, whirling flame-daemons. The ensuing battle rages for solar months, and when a new wave of blood-horrors bursts from the caves at the next equinox, the combined daemonic onslaught sees the personnel of the Cult Mechanicus present slain to a man.
- A New Breed of Overseer (Unknown Date.M32) – House Taranis begins the practice of sending the Nobles that fail to enmesh properly with their Imperial Knights to the Adeptus Mechanicus. Though unfit for a place in Taranis’ Knight armies, each of these cyborg warriors — known as Psychosis-Neuracanium — are from primaris-grade Imperial stock, and prove to be excellent raw material for the creation of Skitarii overseers. Similar exchanges between other Knight and Forge Worlds occur across the galaxy.
M33-M34 The Forging
As the Imperium solidifies its measures of control across key star systems, including the adoption of the Imperial Cult as the official state religion, the Adeptus Mechanicus becomes ever more secretive.
- The Howling (401.M34) – An Adeptus Mechanicus Explorator fleet clashes with the Cacodominus, an alien cyborg of colossal psychic potential. The horrific creature learns well of Humanity and its agents. Within a standard year it controls the populace of thirteen hundred planetary systems. The resultant heresy is ended by a concerted attack from the Legio Cybernetica and their Black Templar allies. Alas, the Cacodominus’ psychic death scream burns out the minds of a billion Astropaths and distorts the signal of the Astronomican itself. Entire sub-sectors slide into barbarism without the light of the Emperor to guide them.
- The Prophet of Cogs (979.M34) – The long-time rivalry between those Tech-priests who dwell in the north of Mars and those of the Martian south flares up into open war. As the conflict grinds on, both sides are assailed by the feral packs of malfunctioning Servitors and burnt-out war machines that haunt the desert wastes. The war reaches a gory conclusion when the self-proclaimed “Prophet of Cogs” broadcasts a control-chorus that binds millions of long-abandoned machines to his cause. Appalled by the half-living cyberghouls he sets on his foes, both the Martian north and south unite to drive him from the face of the Red Planet. Rumours persist that he haunts the Alpha Centauri System well into the 41st Millennium.
M35-M36 Nova Terra Interregnum
The Time of the Two Emperors during the Nova Terra Interregnum pits many forces of the Imperium against each other, and all Forge Worlds are asked to declare their allegiance.
- The Moirae Schism (ca. Early M35) – During the secession of the Segmentum Pacificus during the Nova Terra Interregnum, the rebel Forge World Moirae is destroyed by retaliatory Exterminatus, but not before the Moirae Schism has split the Adeptus Mechanicus in two. The ensuing conflict draws Titan Legions and even those Space Marine Chapters affiliated with the Adeptus Mechanicus into the turmoil. The schism takes a heavy toll on the Adeptus Astartes, resulting in the destruction of dozens of companies and the excommunication of several Iron Hands clans. It takes over two millennia of desperate warfare before the Moirate doctrines are considered fully purged.
- The Fleet Wars (Unknown Date.M35) – Of all the battles of the Moirae Schism, none are so expansive or long-lasting as the prolonged naval engagement over the nebula space fields of the Gulf of Black Shadows. There, mining wars between rival Forge Worlds escalate to massive fleet battles. It is estimated that the wrecks of over ten thousand voidships — from mining craft to vessels of war — float between the gas clouds. Yet the battle is far from over, for within the floating graveyards, salvage crews continue the war for centuries, fighting each other in desperate boarding actions, each side seeking to reclaim valued technology. Entire robot maniples are recovered by opposing sides, and reprogrammed to attack their former controllers.
M36 The Age of Apostasy
A new age of dissent washes over the Imperium. A growing distrust separates the Adeptus Mechanicus from the Adeptus Ministorum, with each side conspiring against the other. Few records of their internecine battles are ever recorded by the Adeptus Administratum, but each side keeps their own secret tally.
- The War of Recovery (104.M36) – Twelve Knightly houses are led by the Adeptus Mechanicus into the Mortuam Chain system. The campaign lasts over a standard century and many human worlds are freed from xenos rule. The interfering Aeldari are defeated when their own weapons are turned against them. Much ancient technology is rediscovered by the great quest. The fact that one of the conquered worlds had already been converted into a Shrine World by missionaries from the Ecclesiarchy is hastily covered up by furtive Tech-priests, who speak only of the triumphant return to Mars of several first-generation STC databases.
- The Xenarite Schism (335.M36) – The Forge World of Stygies VIII comes under attack from dozens of Deathwatch Kill-teams when news of the Xenarites’ dabblings with alien technology reaches the Ordo Xenos. The Adeptus Mechanicus are forced to employ radical measures in order to survive the ensuing purges.
M37-M40 The Age of Redemption
The Imperial Cult gains political momentum, and countless crusades are launched. As the Space Marines and Imperial Guard are drawn into more and more campaigns, the Adeptus Mechanicus conserve their strength, focusing on their own expeditionary fleets, as well as their manufacturing duties to supply the Imperial war machine.
- Missing from Imperial Records (Unknown Date.M37) – Fearful of the growing record of violations against its Tech-priests, the Forge World of Stygies VIII uses viral programming, machine canticles, and infiltration methods to destroy or alter the documentation of the Adeptus Administratum and even the datastacks of the Inquisition itself. Self-perpetuating programs ensure the obfuscation is continuous.
- The Occlusiad (550-560.M37) – The northwestern fringe of the galaxy is ravaged by the Apostles of the Blind King. Rogue Tech-priests who view Humanity as an affront to the Machine God, the Apostles uncover artefacts lost in the Dark Age of Technology that allow the creation of supernovae from the hearts of living suns. Constellations are forever changed as the Apostles purge the outer sectors of the Segmentum Obscurus. War rages for a solar decade as thousands of heretical macroclades and robotic Cohorts Cybernetica exterminate all human life from world after world with chilling efficiency. The tide turns only when Navigator Joyre Macran discovers the palace-warship of the Blind King hidden in a fold of Warpspace. Macran guides the Emperor-class Battleship Dominus Astra to the palace’s location and the Blind King is slain. Without his prescience, the Apostles are overcome — not least due to the efforts of Mars itself and the founding of the heroic Dark Hunters Chapter of Astartes.
- The Telok Expedition (383.M38) – The Radical Magos Vettius Telok leads a foray into the void beyond the Halo Stars in search of the fabled artefact known as the “Breath of the Gods.” His expedition is reported lost with all knowledge.
- The Shadow of Silica Animus (Unkown Date.M38) – Proof is found of dangerous experiments being conducted by rogue cults within the Mechanicus. As the creation of complex and intelligent artificial minds is strictly outlawed, a search-and-destroy inquest begins that probes every single Forge World for signs of the forbidden technology.
- The War of the Golden Cog (Unknown Date.M39) – The Fabricator-General of Mars claims ownership of the riches of the Fortress of the Soulless, lair of the Culexus Temple. A disastrous civil war between Mars and Terra is averted by a sniper’s bullet, but the artefact known as the Golden Cog is left in Skitarii hands.
- Fires of Conscience (Unknown Date.M39) – The rogue Tech-priest Veriliad, after leading his Skitarii to a stomach-churning victory during the Cremation of Alcadia Secundus, knowingly destroys the STC for Phosphex Weapons.
M40 The Waning
With Imperial armies stretched thin across countless campaigns, the Imperium becomes ripe for invasion. Xenos and Chaos attacks increase tenfold, occurring with alarming frequency all across the galaxy.
- Crushing the Mecha-WAAAGH! (Unknown Date.M40) – Led by House Raven, five different Knightly houses, along with no less than a dozen Freeblades, halt the mechanised hordes of WAAAGH! Gluttok. Across several star systems, the Imperial Knights are able to counter the Battlewagons and looted tanks employed by the wily Gluttok. It is on the factory planet of Blastoom that the Warboss‘ Stompa Mob is at last brought to final battle. Leading his Exalted Court into the thick of the fighting, Grevan, the Iron Duke, smashes into the wall of Ork walkers and uses his Reaper Chainsword to rip apart Gluttok’s Stompa. The Stompa’s head can still be seen, for it was taken for display and remains at the Keep Inviolate.
- Graia Assailed (Unknown Date.M40) – When attempting Warp travel with its “Graian Crown,” Forge World Graia is assaulted by Necrons and nearly destroyed.
- The Forbidden Runes (Unknown Date.M40) – After the disastrous Battle of Elixia, Skitarii survivors are sent to extract the runic inscriptions upon the ancient standing stones of Grave’s End. In doing so, they open a long-forgotten gate into the Warp. Elixia is consumed by a daemonic invasion, its remaining populace eliminated by a necessary Exterminatus within the solar week.
- The Reality Cage (743.M40) – The Tech-priests of Venatoria create cagefields of pure law and reason that magnify the material dimension’s inherent resistance to the energies of the Warp. Forbidden to test the resultant technology in realspace, the Tech-priests lead an invasion fleet into the Ocularis Terribilis — the Eye of Terror. Three Venatorians make it back alive to their Forge World. They devote the rest of their careers to the creation of a “reality bomb” that they believe will seal the Eye of Terror forever more. Sadly, their test run, staged upon the yawning Warp rift known only as the Maelstrom, ends in disaster.
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.
- The 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 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.