M42

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A date prescribed to this article or event within the article pertains to events that occur during the 13th Black Crusade and/or Era Indomitus. Both in-universe, as well as out-of universe, per Games Workshop, the exact millennium (whether it is truly M41 or M42) cannot be determined. As an item of convenience, within Lexicanum, you may see "M42" used as placeholder to track events pertaining to Era Indomitus, but does not always purport that it is M42 in-setting, unless it is explicitly stated in source to be M42. See M42 for more information.

000 - 099.M42

Year Event
~001.M42 The Blackness sweeps across the Galaxy due to the formation of the Great Rift. Much of the Imperium is cut off from Terra as communication and Warp Travel is rendered nigh-impossible. Daemonic legions assault much of the Galaxy. Eventually, the effects will wear off and the Indomitus Crusade will reclaim much of the Imperium.[12a]
The Battle of Lion's Gate. Terra is assaulted by the forces of Khorne in its first major invasion in 10,000 years.[12a]
The Indomitus Crusade is waged by Roboute Guilliman.[16]
001-025.M42 The War of Beasts on Vigilus for control of the Nachmund Gauntlet.[37] It eventually escalates into the War of Nightmares when Chaos arrives.[38]
The Nachmund Rift War begins as the war on Vigilus stabilizes.[39]
005.M42 To Serve the Emperor: A Commissar's Life, written by Commissar Ciaphas Cain is published. The writing of his memoirs spurred him to gather and write a full archive of his glorious career. However, this more candid memoir never sees the light of day, being immediately put under Inquisitorial seal by order of Inquisitor Amberley Vail. The archive simply contains far too much sensitive and restricted information. She organises the archive, naming it the Cain Archive, and publishes it "for Inquisitors" only. A high number of Inquisitors read it. She is even persuaded to expand it considerably, making it somewhat of a bestseller among the Inquisition.[21a]
007.M42 Last Stand at Glazer's Creek II - A force of Ventrillian Nobles hold off an overwhelming ork attack on Montar VII.[53]
ca. 010.M42 Battle for the Orestes System (Indomitus Crusade)[22]
ca. 012.M42 The Mantis Warriors and an Imperial Navy taskforce come to the aid of the planet Herodian IV, which is under attack from a Tyranid splinter fleet. Despite taking heavy losses they begin to turn the tide of the battle against the Tyranids, when Inquisitor Lord Brutius Parthon orders the Mantis Warriors to perform an Exterminatus on the planet; after a Deathwatch Kill-Team was extracted from a hidden Ordo Xenos weapons laboratory on Herodian IV's surface.[23]
200 members of the Space Wolves 13th Great Company displaced from the Horus Heresy are recovered from Warp Portals on Prospero.[24]
Like a Phoenix on the Wing: The Early Campaigns and Glorious Victories of the Valhallan 597th, written by Lady General Jenit Sulla (retired) is published. Amberley Vail uses extracts from it multiple times within the Cain Archive.[25]
The Battle of Raukos (Indomitus Crusade)[16a][26]
The Invasion of Ultramar (Plague Wars) - The armies of Nurgle invade Ultramar from the Scourge Stars.[16]
The Fall of the Tartella System (Plague Wars) - The Great Unclean One Ku'gath with an army of deamons conquers the Tartella System.[12d]
The Battle of Iax (Plague Wars) - Unknowing, a group of refugee carried Nurgle's taint and transforms them into Plaguebearers allowing the daemons of Nurgle to manifest on the planet.[16]
The Invasion of Konor (Plague Wars)[17]
The Recapture of the Spandor System (Plague Wars)[12d][16b]
The Battle of Parmenio (Plague Wars)[16]
The Relief of Iax (Plague Wars)[16]
The War in the Rift[28]
The Recapture of the Tartella System (Vengeance Campaigns)[14b]
The Devastation of Baal - Hive Fleet Leviathan invades Baal, homeworld of the Blood Angels Chapter. Guilliman and the Indomitus Crusade arrive at the end of the battle to aid the Blood Angels and their successors. Afterwards, Guilliman appoints Dante as Regent of Imperium Nihilus.[12b]
ca. 015.M42 The Battle of Ulvheim. The Attilan Gap into Imperium Nihilus is stabilized.[43]
The Arks of Omen Campaign is launched by Abaddon and Vashtorr. Angron and Lion El'Jonson return to the mortal realm[10]
The Fourth Tyrannic War begins with a massive tendril of Hive Fleet Leviathan arriving in Segmentum Pacificus.[31]
037.M42 The Return of the Liberator: Ciaphas Cain and the Second Siege of Perlia by Orten Bassit is published. It is later used by Amberley Vail as an extract within the Cain Archive.[29b]
058.M42 The Crusade and After: A Military History of the Damocles Gulf by Vargo Royz is published. It is later used by Amberley Vail as an extract within the Cain Archive.[40]
085.M42 Purge the Guilty! An impartial account of the liberation of Gravalax by Stententious Logar is published. It is later used by Amberley Vail as an extract within the Cain Archive.[21b]
087.M42 Just Visitin': The Life of a Naval Hero by Nelson Lawford is published, a biography of retired Imperial Navy Commodore Hubert Visiter. It is later used by Amberley Vail as an extract within the Cain Archive.[29c]
095.M42 The Abominable Chitin: a Concise History of the Tyrannic Wars by Arten Burrar is published. It is later used by Amberley Vail as an extract within the Cain Archive.[30]
097.M42 Like a Phoenix From the Flames: The Founding of the 597th, written by Lady General Jenit Sulla (retired) is published. Amberley Vail uses extracts from it multiple times within the Cain Archive.[21c]

100 - 199.M42

Year Event
127.M42 In Blackest Night: The Millennial Wars Appraised by Ayjaepi Clothier is published. It is later used by Amberley Vail as an extract within the Cain Archive.[29a]
By logical necessity, this would also be the earliest date that Amberley Vail could have written the Memoirs of Ciaphas Cain, at least those pertaining to Cain's Last Stand. This would be, by her reckoning, at least 125 years after the events of the Second Siege of Perlia and the 13th Black Crusade.[29d]

Era Indomitus

Due to the large amount of undated events in M42, and confusion on the dating system in universe (see below), unknown dates that occur in M42 or the Era Indomitus are listed below.

Event
The Battle for Korvon II - The Ultramarines, led by Lieutenant Calsius, defend against a Death Guard invasion.[1]
The Battle for Meto - The Ultramarines fight against the Orks on the planet of Meto.[2]
The Battle for Mira III - The Ultramarines fight against the Orks on the planet of Mira III.[3]
The Cleansing of Ybrannis - The Salamanders fight against the Death Guard[4a]
The Battle of Warsylask[4b]
The Waaagh! Wazkrumpa[4c]
The Battle on Torquar[4e]
The Battle of Monai Landing[4d]
The Dark Eldar Civil War begins[5c]
The (Talledus War) - Kor Phaeron of the Word Bearers lead an assault to the Talledus System alongside forces of the Night Lords and Iron Warriors.[6a]
The Battle for Benediction (Talledus War)[6b]
The Battle of Ghreddask (Talledus War)[6c]
The Battle of the Tears of the Emperor (Talledus War)[6d]
The Angel's Halo - The Blood Angels initiate the reconquest of the Red Scar Sector against the remained tendrils of the Hive Fleet Leviathan[7a]
The Battle of Kheru (Angel's Halo, Red Scar Campaign) [7b]
The Battle of Ashallon (Angel's Halo, Red Scar Campaign)[7c]
The Battle of Bhelik Alphus (Angel's Halo, Red Scar Campaign)[7d]
The Dark Eldar Raid Saim-Hann[5b]
The Saga of the Beast
The Revenge for Ceibhal (Saga of the Beast)[8a]
The Storming of Leckides (Saga of the Beast)[8b]
The Purging of Gaivos (Saga of the Beast)[8c]
The Ambush at Gnarion Reef (Saga of the Beast)[8d]
The Siege of Gottgaard (Saga of the Beast)[8e]
The Cleansing of Brakhutos (Saga of the Beast)[8f]
The Battle of Krongar (Saga of the Beast)[8g]
Metalica is corrupted in the Charadon Campaign[33]
The Ork Empire of Octarius is devastated in the Octarius War[34]
The Cleansing of Ganymede (Indomitus Crusade)[9]
The Battle of Machorta Sound (The Crusade of Slaughter, Indomitus Crusade)[11]
The Dark Eldar Civil War - Asdrubael Vect attempts to counter the power of the Ynnari[5c]
The Psychic Awakening begins[5a]
The Salamanders prevent the summoning of Angron on Armageddon.[12b]
Ghazghkull Mag Uruk Thraka leaves the Octarius War at the head of a fleet of 5 million Greenskin warships to lead against the Imperium.[13]
After the 13th Black Crusade and formation of the Great Rift, Perturabo unleashed a thousand armies and coordinated them in a grand strategy against the most heavily defended worlds in Segmentum Obscurus.[14c]
The Invasion of the Stygius Sector - Magnus the Red and his forces invade the Stygius Sector[12e]
Second Relief of Mordian (Invasion of the Stygius Sector)[17]
The Siege of the Rock - sees Luther freed.[18]
The Cerberax Wars - Forces of Khorne fight against the Necrons near Ymga Monolith.[19]
The Battle of Iathglas - The Ynnari battle the forces of Slaanesh in the Battle of Iathglas[5d]
The Battle of Ulthwe.[42]
The Sky Sentinels are destroyed by Magnus the Red and his Thousand Sons.[12c]
The Invasion of Iyanden - N'Kisha invades Craftworld Iyanden.[12f]
The Tau Empire wage their Fourth Sphere of Expansion, which is thought lost. Several decades later, contact is re-established through the Startide Nexus and the Fifth Sphere of Expansion is launched.[20] A Sixth Sphere of Expansion is further planned.[32]
Imperial and Ork forces temporarily unite to battle Daemons during the Third War for Armageddon.[12b]
Catachan defeats a Daemonic invasion.[14a]
Asdrubael Vect is "assassinated", only to be reborn as a Living Dark Muse.[15]
The Pariah Crusade begins between the Imperium and Necrons under the Silent King Szarekh.[35] It eventually escalates into the Necron Civil War.[36]
Several years after the opening of the Great Rift, a Dominion Genesis vessel is discovered by Explorator Talin Sherax, Idranvel of Biel-Tan, and Necron forces. The ancient Aeldari vessel is fought over and ultimately sent crashing into the surface of the unnamed world it was terraforming by the Adeptus Mechanicus explorator.[50]

Trivia

TriviaScrollTrans.png

The following information is not to be regarded as officially sanctioned and/ or is not written from an in-universe point of view. A detailed explanation of the term "Trivia" as used in the Lexicanum can be found here.

  • Earlier publications of Dark Imperium (Novel) took place roughly 100 years after the start of the Indomitus Crusade, and concluded at the Battle of Raukos. However in 2021 Black Library explicitly revised certain aspects of the novels, including setting the events to roughly 012.M42 as well as adding events from the Dawn of Fire series.[47]
  • It is feasible that, given the secretive nature of the Inquisition, the doubt as to whether or not the Indomitus Crusade takes place in M42 or M41 is knowledge that is limited to the Ordo Chronos and Roboute Guilliman, and that the Galaxy at large simply moves on as if it were M42.[16c] This would explain how other historians and even Inquisitors such as Amberley Vail would date events that occur during and after the 13th Black Crusade as M42.
Spoiler!
The following paragraphs contain spoilers for: Kill Team (Novel)
  • Even Inquisitors themselves are not always adequately informed about galactic events at large. In Kill Team (Novel), T'au envoys are surprised when Inquisitor Oriel expresses that he and his retinue have no knowledge of the Damocles Crusade.[48] Amberley, despite being an Inquisitor herself, may not be awares of the Chronostrife.

"M42"

The millennium of M42 has been used by Games Workshop in various works, both from an out of character and in character perspective.
For an example of an in-character use, the events of the Second Siege of Perlia as part of the 13th Black Crusade are confidently stated by Amberley Vail as having occurred between the years of 002.M42-005.M42.[29d] Similarly, she references multiple historical writers within the Imperium who have recorded the events of the siege from a later M42 date. These include:

Given that Cain was also alive to fight the Second Siege of Perlia in the early years of M42, it would also, logically, lead to the reasonable assumption that his burial as referenced by Amberley[44] would also have occurred in M42. Similarly, in order to reference In Blackest Night: The Millennial Wars Appraised in her writings, Amberley herself would need to be alive as of the year 127.M42 at least.[29a]

For an out-of-character example, narrative events have also been hosted by Games Workshop subsidiaries, such as Operation Storm Falcon by Games Workshop Germany as explicitly taking 26 years after M42 and The Jollis Raid (which occured "at the end of the 41st Millennium".[45][51]text-middle[GW Germany]

A timeline of some major battles involving Marneus Calgar. Note that the Siege of Ultramar explicitly takes place in 999.M41.[49]

Furthermore, multiple sources confidently put several dates pertaining to the 13th Black Crusade as being explicitly 999.M41. A non-exhaustive list of this includes:

It would logically follow that any event that takes place a year or more after 999.M41 would be at least 001.M42 (or 000.M42) according to the Imperial Dating System.

However, GW has also introduced the notion of doubt as to whether the events of the Era Indomitus truly are the 42nd Millennium or not. The emergence of the Great Rift has caused uneven temporal shifts across the galaxy, with time itself being affected.[46] Twelve years after the start of the Indomitus Crusade[16d][See Trivia] the Primarch Roboute Guilliman made an attempt to determine the true date based upon the Imperial Dating System as laid out by the Emperor during the Great Crusade. This was, he notes, made ever difficult by over 10 millennia worth of both dogmatic adherence and thoughtless revisionism, as well as various rivalling dating systems which had evolved from the original Calendar, which made a true chronicle of the galaxy almost impossible to construct. To his consternation, he calculated that year to be "anywhere between early M41 and a millennium later." It would be the contentious issue of the Imperial date over which the Ordo Chronos would wage the internal Chronostrife amongst itself.[16c]

Aaron Dembski-Bowden on his personal Twitter account had this to say regarding the notion of M42:

  • Aaron Dembski-Bowden on Twitter

  • Aaron Dembski-Bowden on Twitter

Certain battles that have confirmedly taken place post Great Rift, such as the 2025 Grand Narrative battle for Mordian, which would include forces of the resurgent Leagues of Votann and also of Primaris Marines, are described by Games Workshop as "in the 41st Millennium."[52] In the 2017 version of Dark Imperium (Novel), the time period was explicitly described as the 41st Millennium, though this would be changed to "Era Indomitus" in the second edition of the novel.[41]

For the purposes of convenience, in order to create some semblance of chronological event ordering and not to confuse certain events with others that have confirmedly occurred early in M41 and well before the 13th Black Crusade, M42 is used by Lexicanum for certain dates. Some of these dates, as mentioned previously, have themselves been stated by Games Workshop as occurring in M42. Others are conjectured extrapolations based upon the notion of setting the events of the 13th Black Crusade in 999.M41 as stated by Games Workshop.

See also

Sources

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This article is based on information Games Workshop Germany created on their own behalf and may conflict with more general background material.


M41 Timeline
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