Changes

|The [[Grimoire Hereticus]], a list with information on the Space Marine [[Legions]] which turned during the [[Horus Heresy]], is written.|[[Codex: Space Marines (4th Edition)]]{{cite thisFn|1}}

|The [[Commorragh Raid]], the [[Salamanders]] [[Strike Cruiser]] ''[[Forgehammer]]'' was disabled and transported to [[Commorragh]]. In retaliation the [[Salamanders]], [[Howling Griffons]], and [[Silver Skulls]] invaded Commorragh rescuing the Strike Cruiser and destroying nearly all of the noble houses of the Dark City. A power vaccuum emerged that was only filled by [[Asdrubael Vect]] and his [[Kabal]] of the [[Kabal of the Black Heart|Black Heart]].{{Fn|[[Codex: Dark Eldar (5th Edition)]], pgs. 13-152}}

|An [[Explorator Fleet]] out of [[Triplex Phall]] discovers the [[Tiamet System]]. All seven planets support life that is aggressively carnivorous, hostile to human explorers, and appears to share a single intelligence. The explorators are forced to quarantine themselves to prevent Tiamet's lifeforms from leaving the system, transmitting data for one hundred sixty-two hours before succumbing to Tiamet's ecosystem.{{Fn|[[Codex: Tyranids (4th Edition)]], pg. 243}}

|The [[Ork]] [[Warboss|Warlord]] [[Arrgard the Defiler]] overruns the [[Tigrus]] [[Forge World]], destroying the original designs for the [[Leman Russ Vanquisher]].{{Fn|4}}|-||The [[Moirae Schism]], concurrent with the Nova Terra Interregnum, splits the [[Imperial Armour Volume One Adeptus Mechanicus]] and closely- Imperial Guard associated [[Collegia Titanica|Titan Legions]] and Imperial Navy[[Space Marine Chapter]]s. The [[Raukaan Clan]] of the [[Iron Hands]] remains unified in doctrine. The [[Mars|Martian]] fleet destroys [[Moirae]] [[forge world]]to purge its heretical doctrines, pgwhich will take over two thousand years to complete. 31{{Fn|5}}{{Fn|6}}{{Fn|7}}

|[[Ecclesiarchy]]'s power wanes.|[[Codex: Sisters of Battle (2nd Edition)]]{{cite thisFn|8x}}

|[[Nova Terra Interregnum]]: The Ur-Council of [[Nova Terra]] denounce the [[High Lords of Terra]] and secede from the [[Imperium]], taking the entire [[Segmentum Pacificus]] with them. For 900 years, the Imperium is a bisected empire.{{Fn|[[Warhammer 40,000 5th Edition Rulebook]], pg. 1249a}}

|Early M35|The [[Moirae SchismIcaria Crusade]], concurrent with . Near the end of the Nova Terra Interregnumthirty-year campaign, splits the a [[Adeptus MechanicusFrateris Templar]] and closely-associated force secures an ancient factory on [[Collegia Titanica|Titan LegionsFornoth]] and discovers a [[Space Marine ChapterDark Age of Technology]]sdatabase. The [[Raukaan Clan]] of only new design culled from the [[Iron Hands]] remains unified in doctrinefactory concerned a half-designed flamethrower tank. The data is combined with Imperial technology to produce the [[Mars|Martian]] fleet destroys [[MoiraeImmolator]] for the [[forge worldAdepta Sororitas]] to purge its heretical doctrines, which will take over two thousand years to complete.|[[Warhammer 40,000 6th Edition Rulebook]] pg. 170;<br>[[Imperial Armour Volume Ten - The Badab War - Part Two|Imperial Armour Volume Ten{{Fn|]] pg. 96;<br>[[Clan Raukaan - A Codex: Space Marines Supplement (6th Edition)]], pg. 1708b}}

|The [[Dark Angels]] dispatch the [[Ravenwing]] to [[Nova Terra]] to follow a lead on [[The Fallen]], but return without prisoners.{{Fn|[[Codex: Dark Angels (6th Edition)]], pg. 2310}}

|[[Achernar Invasion]] - The [[Blood Angels]] [[3rd Company (Blood Angels)|3rd Company]] is reassigned to counter [[Ork]]ish raids in the [[Achernar system]], perilously close to [[Terra|Holy Terra]]. The Sons of [[Sanguinius]] wipe them out so effectively that no Orks will be seen within a dozen light years of Achernar for millennia.{{Fn|[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes|Imperial Armour Volume Two - Second Edition]], pg. 1711}}

|[[Benedin IV]] orders the [[Holy Synod]] moved from [[Terra]] to [[Ophelia VII]]. Separated from the [[Senatorum Imperialis]] by ten thousand light years, the [[Ecclesiarchy]]'s power increases, forming the [[Frateris Templar]] forces that rival the size of the [[Imperial Guard]].{{Fn|[[Codex: Sisters of Battle (2nd Edition)]], pg. 16<br> [[Dark Heresy: Blood of Martyrs]] pg. 98a}}{{Fn|-|Early M35|The [[Icaria Crusade]]. Near the end of the thirty-year campaign, a [[Frateris Templar]] force secures an ancient factory on [[Fornoth]] and discovers a [[Dark Age of Technology]] database. The only new design culled from the factory concerned a half-designed flamethrower tank. The data is combined with Imperial technology to produce the [[Immolator]] for the [[Adepta Sororitas]].|[[Codex: Sisters of Battle (2nd Edition)]], pg. 4612}}

|The [[Grand Hunt]]. [[House Raven]] and [[Skitarii]] fight [[Eldar]] [[Exodite]]s and [[Craftworld]] [[Biel-Tan]] on [[Geminex]]. After securing every bit of hard data they can the Skitarii withdraw, leaving the [[Knight]]s of House Raven to their doom.{{Fn|[[Codex: Skitarii (7th Edition)]], pg. 21 — ''The March of Time: The Grand Hunt''13}}

|Initial Imperial surveys of tomb complexes on [[Angelis]] (Gorkamorka). Later in [[M35]], an [[Ork]] [[Space Hulk]] crash lands on Angelis, burying the humans alive around the temples. The survivors descend into savagery, becoming the [[Diggas]]. [[Necron]]s possibly ally with some members of the Diggas to subjugate the other tribes and repulse the [[Orks]].|{{cite thisCME}}

|The [[Blood Angels]], [[Astra Militarum]], and [[Imperial Knight]]s of [[House Griffith]] defeat [[Waaagh! Starsmasha]] in the [[Redhaven System]].{{Fn|[[Codex: Blood Angels (7th Edition)]] ''A Chronicle of Heroes''14}}

|The [[Deathwing]] deploys in its entirety to capture [[Obidiah Hrakon]], supporter of Nova Terra and a [[The Fallen|Fallen Angel]].{{Fn|[[Codex: Dark Angels (6th Edition)]], pg. 2310}}

|[[Greigor XI]] becomes [[Ecclesiarch]] and declares that the [[Ecclesiarchy]] will return to [[Terra]]. The [[cardinal]]s oppose his proposition, citing the institution's heavily-entrenched position on [[Ophelia VII]]. Tithes are increased in order to finance the decade-long relocation to and improvement of the Ecclesiarchy's palaces on Terra.{{Fn|[[Codex: Sisters of Battle (2nd Edition)]]8x}}{{cite thisFn|12}}; [[Dark Heresy: Blood of Martyrs]] pg. 9

|Five companies of the [[Black Wings]] [[Chapter]] turn on their brothers at the height of their centennial Ritual of Remembrance. Hundreds are slain, several strike cruisers are destroyed, and much of the fortress-monastery is destroyed before the renegades are driven off. The Chapter halves its crimson armour with black until they can hunt down their renegade brethren.{{Fn|[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes|Imperial Armour Volume Two - Second Edition]], pg. 1711}}

|[[Tallarn Desert Raiders|Tallarn]] scout squad [[Lurenz's Gravediggers]] harass [[Eldar]] forces on [[Holon Prime]].|{{cite thisCME}}

|The [[Adeptus Mechanicus]] explorator vessel ''[[Land's Vision]]'' discovers [[T'au]] and its [[Tau|Stone Age inhabitants]]. Subsequent [[Warp storm]]s prevent all Imperial colonization attempts.{{Fn|[[Codex: Tau (3rd Edition)]] pg. 4; [[Codex: Tau Empire (4th Edition)]] pg. 415}}{{Fn|16}}

|[[The Barbarus Incursion]] - [[Black Templars]] fought with [[Daemons]]. Later all records of this Incursion were expunged.{{Fn|[[Imperial Armour Volume Two - Space Marines and Forces of the Inquisition11}}{{Fn|Imperial Armour Volume Two]], pg. 75;<br>[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes|Imperial Armour Volume Two - Second Edition]], pg. 17}}

|[[Daemon]]s infiltrate the [[Eldar]] [[Exodite]] world of [[Menimshemash]] through its "[[World Spirit]]" and burn it with the fires of change.{{Fn|[[Codex: Chaos Daemons (6th Edition)]], pg. 2118}}

|The [[Decimator (Daemon Engine)|Decimator]] [[daemon engine]] is first recorded in Imperial space during the [[Grief of Herodin]]. The machine is traced back to the works of the heretical Sepketraal cult, thought destroyed in the Scouring.{{Fn|[[Imperial Armour Volume Thirteen - War Machines of the Lost and the Damned|Imperial Armour Volume Thirteen]], pgs. 22 & 12619}}

|The [[Cataclysm of Souls]]: the [[Ecclesiarchy]] begins to rebuild the sundered [[Imperium]] as a religious state, entering into wars of faith with the forces of Nova Terra. The [[Dark Angels]] take part in order to pursue the Fallen.{{Fn|[[Warhammer 40,000 5th Edition Rulebook]] pg. 125; [[Codex: Dark Angels (6th Edition)]] pg. 239b}}{{Fn|10}}

|The [[Ultramarines]] [[battle barge]] ''[[Excelsior (Battle Barge)|Excelsior]]'' fails to rematerialize following failure of its [[Gellar field]] in Warp-transit.{{Fn|[[Codex: Chaos Daemons (6th Edition)]], pg. 2118}}

|The [[Dark Angels]] abandon their mission to cleanse Imperial space of [[Hrud]] infestation. The [[Chapter Master]] of the [[Ultramarines]] files a complaint with the [[High Lords of Terra]], but action is never taken.{{Fn|[[Codex: Dark Angels (6th Edition)]], pg. 2310}}

|The [[21st Founding]]. Most, if not all, the [[Space Marine]] [[Chapter]]s established in this Founding suffer catastrophic misfortunes. The [[Grey Knights]] are called to expunge the failures of the '''Cursed Founding'''.{{Fn|[[Warhammer 40,000 6th Edition Rulebook]], pg. 1705}}