Changes

|[[Warp Storm]] ''Gae-sann'' envelops the [[Kai]] system and absorbs it into the [[Eye of Terror]].{{Fn|[[Codex: Chaos Space Marines (3rd Edition, 2nd Codex)]]1}}

|The [[Blackstar Crusade]]. [[Chaos]] forces emerge from the [[Eye of Terror]] to mount a crusade into the [[Ganglax Sector]]. [[Khorne]] champion [[Ekrak]] conquers [[M'laan XIII]] and turns it into a [[Daemon World]].{{Fn|2}}|-|Late M34{{Fn|5}}|[[Obscuran Uprising]]s. The [[Sons of Vengeance]] crush the [[Free Council of Hannedra II]] and then turn renegade.{{Fn|5}}|-|Late M34{{Fn|6}}|[[White Dwarf 246 (UK)Ecclesiarchy]] pgpower wanes. 64{{Fn|6}}|-|Late M34{{Fn|7}}|The [[Pale Wasting]]. Eleven [[Space Marine]] [[Chapter]]s are lost to an unknown enemy originating from the [[Ghoul Stars]].{{Fn|7}}

|001.M34{{Fn|1}}{{Fn|3}}|The [[4th Black Crusade]]. Destruction of the [[Citadel of Kromarch]] on [[El'Phanor]] before crushed.{{Fn|1}}{{Fn|[[Liber Chaotica: Khorne]], [[Codex: Chaos Space Marines (3rd Edition, 2nd Codex)]]3}}

|085.M34{{Fn|4}}|The [[Terrorforming of Atasca IV]] is carried out.{{Fn|[[Codex: Skitarii (7th Edition)]], ''The March of Time''4}}

|101.M34{{Fn|8}}|[[Dark Angels]] Supreme Grand Master Armaros contracts Bloodpox while leading the fight against the [[Death Guard]] and the [[Brotherhood of Plague]]. He immediately passes the [[Lion Helm]] to his successor and steps into [[The Rock]]'s main reactor, killing himself before he can spread the disease.{{Fn|[[Codex: Dark Angels (6th Edition)]] pg. 238}}

|118.M34{{Fn|9}}|In the Hour of Shadow, [[Chapter Master]] [[Khardin Gol]] of the [[Black Wings]] and numerous Imperial lords are assassinated, plunging [[Lorin Alpha]] into civil war. The Black Wings pursue the [[Tenebrae]] Chaos renegades into the [[Veiled Region]].{{Fn|[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes]] pg. 179}}

|216.M34{{Fn|10}}|While enforcing the quarantine zone around the [[Pale Wasting]], [[Raukaan Clan]] ruthlessly exterminates fleeing [[xenos]], as well as the entire Yormethi 26th [[Imperial Guard]] regiment.{{Fn|[[Clan Raukaan - A Codex: Space Marines Supplement (6th Edition)]]10}}

|230.M34{{Fn|11}}|The [[Trachesai Massacre]]. [[Blood Angels]] [[Devastator Squad]]s are noted to rush the enemy to engage in close combat.{{Fn|[[Index Astartes II]]: [[Blood Angels]]11}}

|303.M34{{Fn|4}}|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)]], ''The March of Time''4}}

|401.M34{{Fn|12}}|The Howling: A strikeforce of [[Black Templar]] [[Space Marines]] kill the Cacodominus, a powerful [[alien]] [[psyker]]; the resultant psychic death-scream burns out the minds of a billion [[astropaths]] and disrupts the [[Astronomican]]. Millions of ships are lost and entire [[sub-sectors]] lose contact with the wider [[Imperium]].{{Fn|[[Warhammer 40,000 5th Edition Rulebook]]12}}

|438.M34{{Fn|9}}|A single strike cruiser bearing [[Black Wings]] livery returns from the outer void. The handful of survivors refuse to speak of what they had endured to anyone save agents of the [[Ordo Malleus]]. As they rebuild from their stocks of [[gene-seed]], the Black Wings declare an eternal oath of vendetta against [[Tenebrae]].{{Fn|[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes]] pg. 179}}

|456.M34{{Fn|8}}|Inquisitor Halleck captures the notorious heretic known as the Angel of Truth. He claims to have broken the Angel but disappears en route back to [[Terra]]. The [[Dark Angels]] strike cruiser ''Black Sword of Vengeance'' investigates and finds no trace of the Inquisitor, his vessel, or his prisoner.{{Fn|[[Codex: Dark Angels (6th Edition)]] pg. 238}}

|490.M34{{Fn|9}}|The [[Rampagers]] 6th Company topples the rebel theocracy of [[Dabenlar III]] in a single night before brutally purging the population of heresy and asserting recruitment rights over them. See also - [[The Dabenlar III Campaign]]{{Fn|[[Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes]], pg. 179}}

|498-601.M34{{Fn|13a}}|Following the campaigns that are later called the [[Berillia Massacres]], the Shining Blades' methods are called into question. They attack their allies and the [[Red Scorpions]] are sent to bring them to justice. The Shining Blades reveal their true allegiance to [[Slaanesh]] in the ensuing war and declare themselves the [[Flawless Host]].{{Fn|[[Imperial Armour Volume Thirteen - War Machines of the Lost and the Damned]] pg. 2113a}}

|ca. 500.M34{{Fn|14}}{{Fn|15}}|The Eighth [[Founding]]. Space Marine Chapters created in this Founding include the [[Mantis Warriors]] and the [[Angels Revenant]].{{Fn|14}}{{Fn|[[Imperial Armour Volume Ten - The Badab War - Part Two]] pg. 64; [[Imperial Armour Volume Twelve - The Fall of Orpheus]] pgs. 32-3315}}

|600-730.M34{{Fn|13b}}|The [[Iron Warriors]] on [[Medrengard]] come to civil war, shattering into numerous warbands. As abruptly as the fighting began, it stops. Some attribute the violence to the plans of their daemon [[Primarch]] [[Perturabo]], in order to cull the weakness from his legion.{{Fn|[[Imperial Armour Volume Thirteen - War Machines of the Lost and the Damned]] pg. 2213b}}

|647.M34{{Fn|16}}|The [[Remembrancer|Documentarian]] [[Lasko Pyre]], the only known slave to have escaped the [[Dark Eldar]] city of [[Commorragh]], commits suicide.{{Fn|[[Codex: Dark Eldar (3rd Edition)]]16}}

|666.M34{{Fn|17}}|The first sighting of a [[Warp Star]] after a fierce storm bursts out from the [[Eye of Terror]].{{Fn|[[Warhammer 40,000 6th Edition Rulebook]], pg. 17017}}

|764.M34{{Fn|18}}|[[The Shattering]]. [[Craftworld]] [[Lugganath]] comes under vicious attack from a psychically-shielded fleet of the [[Emperor's Children]].{{Fn|[[Codex: Chaos Space Marines (6th Edition)]] pg. 2218}}

|843.M34{{Fn|19}}|The Imperial frigate ''Hand of Mercy'' responds to a faint distress call originating from [[Grendel's World]]. There they find the entire planet dead, the work of the [[Night Lords]]. Observations of the genocide lead to an understanding of how the Night Lords operate.{{Fn|[[Index Astartes]]: [[Night Lords]]19}}

|934.M34{{Fn|17}}|The [[Warnings of Ulthwé]].{{Fn|[[Warhammer 40,000 6th Edition Rulebook]], pg. 17017}}

|The [[North-South Mars Conflict]]||-|Late M34|[[Obscuran Uprising]]s. The [[Sons of Vengeance]] crush the [[Free Council of Hannedra II]] and then turn renegade.|[[Codex: Chaos Space Marines (4th Edition)]] pgs. 17-18, 24)|-|Late M34|[[Ecclesiarchy]] power wanes.|[[Codex: Sisters of Battle (2nd Edition)]]|-|Late M34|The [[Pale Wasting]]. Eleven [[Space Marine]] [[Chapter]]s are lost to an unknown enemy originating from the [[Ghoul Stars]].|[[Imperial Armour Volume Nine - The Badab War - Part One]], pg. 118{{CME}}