Editing 2557

{{Status|Canon}}
{{Yearnav
|century=26th century
|image=File:H4-ComposerFiringOnPhoenix.jpg
|caption=The [[Ur-Didact]] fires the Composer at [[New Phoenix]].
|previous1=2555
|previous2=2556
|next1=2558
|next2=2559
}}
'''2557''' was a year in the 2550s in the 26th century.

==Events==
===January===
'''January'''
*[[Rion Forge]] and her crew aboard the ''[[Ace of Spades]]'' discover the wreckage of the {{UNSCShip|Roman Blue}} on [[Eiro]].<ref name="F289">'''[[Halo: Fractures]]''', ''[[Into the Fire]]'', ''page 289''</ref>
*The ''Ace of Spades'' and her crew investigate the wreckage of the ''[[Radiant Perception]]'' and rescue [[Ram Chalva]] from [[Gek 'Lhar]] on [[Laconia]].<ref name="SAS">''[[Halo: Smoke and Shadow]]''</ref>
*Rion's crew faces off with Gek 'Lhar and his [[Sangheili]] in the debris field of [[Trove]]. [[Cade]] is killed and [[Little Bit|what remains]] of the [[shield world]]'s [[ancilla]] is recovered by the ''Ace of Spades'' crew.{{Ref/Reuse|SAS}}

===February===
'''February 2'''
*''[[Shadow of Intent]]'' leaves the [[Urs system]] for a diplomatic mission in former [[Covenant]] territory.<ref name="Catalog">[https://forums.halowaypoint.com/yaf_postsm2969315_Catalog-Interaction.aspx#post2969315 '''Halo Waypoint''': ''Catalog Interaction - Page 14'']</ref>
'''February 21'''
*{{UNSCShip|Infinity}} is commissioned into service.<ref>'''Halo 4''', ''[[The Commissioning]]''</ref><ref name="packet">'''[[Halo 4 Limited Edition]]''' — ''[[Infinity Briefing Packet]]''</ref>

===March===
'''March 3'''
*An accident involving experimental weaponry aboard ''[[Argent Moon]]'' causes a gaseous toxic substance to spread throughout the ship via its air systems, killing nearly all aboard. Those closer to the accident are killed instantly and, depending on distance from the accident, the rest of the vessel's personnel begin suffering symptoms from the chemical minutes or hours later.<ref name="blue team intel">'''Halo 5: Guardians''', campaign level, ''[[Blue Team (level)|Blue Team]]'' - [[Mission Intel]]</ref> 
'''March 17'''
*All ''Argent Moon'' crew is killed by the biological agent, with only the shipboard AI, [[Rooker]], still active. As a result, ONI loses contact with ''Argent Moon'' and Rooker sends a message that warns any ONI personnel who board the station of the situation, then puts the ship on a course that keeps it away from all inhabited systems and jettisons what remains he can into open space.{{Ref/Reuse|blue team intel}}

===May–June===
'''May 6 to June 1'''
*''Shadow of Intent'' participates in naval exercises with the [[UNSC Navy]] in a [[Joint Occupation Zone]]. After this, the ship is tasked with the protection of [[Sanghelios]] and [[Sangheili]] colonies.{{Ref/Reuse|Catalog}}

===June===
'''June 8'''
*At 0221 hours, the {{UNSCShip|Taurokado}} [[Mission to the Korinth Prior system|arrives]] in the [[Korinth Prior system]] near the accretion disk created by the remains of [[Trove]].<ref name="lootcrate4">'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #4]]''</ref>
'''June 21'''
*At 0550 hours, [[After Action Report Q74S295-LR]] concerning the mission to the Korinth Prior system is sent by the [[artificial intelligence]], [[Turkish]], to [[Hugo Barton]].{{Ref/Reuse|lootcrate4}}

===July===
'''July 2'''
*{{UNSCShip|Rubicon}}, an ONI vessel sent to reconnoiter [[Installation 00]] in late [[2553]], is officially declared lost.{{Ref/Reuse|Catalog}}
'''July 21'''
*Having tried in vain for [[2554|three years]], [[Jul 'Mdama's Covenant faction]] finally gain access to the [[shield world]] [[Requiem]]; [[Shipmaster]] [[Jul 'Mdama]] orders his forces to board {{UNSCShip|Forward Unto Dawn}} to keep the ship from landing on Requiem.<ref name="terminal">[http://www.halowaypoint.com/en-us/Universe/detail/halo-4-terminal-jul-mdama/0f378de5-e0e3-4f31-a1e1-2a363af4094d '''Halo Waypoint:''' ''Halo 4 Terminal: Jul 'Mdama'']</ref> Aboard the ''Forward Unto Dawn'', [[Cortana]] wakes [[John-117]] from his [[cryotube]] and warns him of the intruders. Once off the [[UNSC frigate|frigate]], they are forcibly pulled into the artificial planet.<ref>'''Halo 4''', campaign level ''[[Dawn]]''</ref>
*John-117 and Cortana engage 'Mdama's Covenant forces on Requiem while attempting to find a way back to UNSC-controlled space. Meanwhile, {{UNSCShip|Infinity}} is approaching Requiem, oblivious of the [[Gravity well (physics)|gravity well]] which pulled the ''Dawn'' and many Covenant ships inside. While attempting to clear the communications interference preventing them from contacting ''Infinity'', John-117 and Cortana are attacked by mechanical [[Promethean]] forces. Activating a supposed broadcast relay in Requiem's core, John-117 instead accidentally releases the [[Ur-Didact|Didact]] from imprisonment. Bent on preventing human ascendance, the Didact leaves immediately and joins forces with Jul 'Mdama's Covenant.<ref>'''Halo 4''', campaign level ''[[Forerunner (level)|Forerunner]]''</ref>
*UNSC ''Infinity'' crashes on Requiem. The Didact makes for the crash-site, followed by the Master Chief, who reunites with the UNSC for the first time in years and assists in the defense of the stranded ''Infinity'', eventually driving back the Didact and 'Mdama's Covenant forces. Afterwards, [[Captain (Navy)|Captain]] [[Andrew Del Rio]] has a difference of opinion with the Master Chief on whether or not they should leave Requiem, or stay and deal with the Didact.<ref name="infinity">'''Halo 4''', campaign level ''[[Infinity (Halo 4 level)|Infinity]]''</ref><ref name="DD7">'''[[Halo Legendary Crate]]''' ''- [[Halo Legendary Crate/Data Drops|Data Drop #7]]''</ref>
*Del Rio orders the Chief to join [[Gypsy Company]] and destroy Requiem's [[Gravity well|gravity well generator]] so that the ''Infinity'' can depart.<ref name="reclaimer">'''Halo 4''', campaign level ''[[Reclaimer (level)|Reclaimer]]''</ref>
**During the mission, John-117 encounters a vision of the [[Librarian]], who warns him of the Didact's true plan: to use a machine known as the [[Composer]] to neutralize humanity once and for all. To fight the Didact, the Librarian provides the Spartan with additional genetic enhancements, including an immunity to the Composer. Once the gravity well is destroyed, Captain Del Rio orders the ''Infinity'' to leave Requiem immediately. Disobeying orders, the Master Chief stays behind in an effort to stop the Didact.{{Ref/Reuse|reclaimer}}
'''Between July 22-July 23'''
*After the ''Infinity'' returns to [[Earth]], [[UNSC Fleet Command|FLEETCOM]] immediately relieves Captain Del Rio of his duties as captain of the ship due to his actions on Requiem; [[Thomas Lasky]] is promoted in his place.<ref name="midnight">'''Halo 4''', campaign level ''[[Midnight]]''</ref>
'''Between July 22-July 24'''
*The Didact repeatedly contacts [[Catalog]] and requests authorization to take control of the [[ecumene]]; Catalog rejects his requests.{{Ref/Reuse|Catalog}}
'''July 24'''
*[[Raid on Ivanoff Station]]: John-117 pursues the Didact as he travels to ''[[Ivanoff Station]]'' to acquire the Composer. The Didact is eventually successful and uses the Composer to digitize the occupants of ''Ivanoff'', save for John-117 who is saved by the Librarian's enhancements.<ref>'''Halo 4''', campaign level ''[[Composer (level)|Composer]]''</ref><ref name="escalation8">'''[[Halo: Escalation]]''' - ''[[Halo: Escalation Issue 8|Issue #8]]''</ref>
*SPARTAN-II [[Black Team]], assigned as security for a science camp on Installation 03, loses contact with ''Ivanoff Station'' immediately after the attack.<ref name="HE9">'''Halo: Escalation''' - ''[[Halo: Escalation Issue 9|Issue #9]]''</ref>
'''July 25'''
*[[New Phoenix Incident]]: As the Didact plans to attack Earth and wipe out humanity using the Composer, John-117 follows him in close pursuit. When the Didact reaches Earth, the ''Infinity'' and the [[UNSC Home Fleet]] engage his ship immediately. Armed with a [[HAVOK tactical nuclear weapon|nuclear device]], John-117 makes his way into the ship and confronts the Didact, but not before the Forerunner uses the Composer to digitize the entire population of [[New Phoenix]], [[United Republic of North America|URNA]]. With the aid of a rampant Cortana, the Master Chief is eventually able to defeat the Didact, who falls into a slipspace rupture generated underneath the Composer. The Master Chief then destroys the ship with the nuclear device. Cortana sacrifices herself to save John-117 from the explosion and the Spartan is recovered from the debris field soon after.{{Ref/Reuse|midnight}}
*Unknown to everyone, Cortana survives with the debris of the ''Mantle's Approach'' and is pulled through slipspace to the Forerunner installation designated [[Genesis]]. There, she gains access to the [[Domain]] which "cures" her rampancy. Cortana meets with the [[Warden Eternal]] and both begin to plan to take the Mantle of Responsibility for the AIs.<ref>'''[[Halo 5: Guardians]]''', campaign level ''[[Reunion]]''</ref>
*After falling into the Composer's slipspace rupture, the Didact is thrown to the surface of Installation 03 along with other detritus from ''Mantle's Approach''. On Gamma Halo, the Didact awakens and brutally kills Team Black and the nearby UNSC science team.{{Ref/Reuse|HE9}}
*A group of [[SPARTAN-IV program|SPARTAN-IV]] recruits is deployed offworld at the time of the attack.{{Ref/Reuse|VIS}}
*A service [[portal]] opens between the [[Composer's Abyss]] on [[Installation 03]] and the [[Composer's Forge]]. The latter's monitor, [[859 Static Carillon]], attempts to contact the Halo's caretaker, [[049 Abject Testament]], but receives no response. Static Carillon travels through the portal to Installation 03, where he meets the Didact who asks to be taken to the Composer's Forge.{{Ref/Reuse|HE9}}
*John-117 is debriefed by the [[UNSC Security Council]] about the Didact and the loss of Cortana. The Council decides to tell the public that the attack was carried out by the [[Covenant remnants]] and it was stopped by Master Chief.{{Ref/Reuse|escalation8}}
*[[Terrence Hood|Fleet Admiral Terrence Hood]] informs John-117 about the loss of contact with the Installation 03 science team an hour earlier, and that the attackers may have been Prometheans. John reunites with [[Blue Team]] — [[Frederic-104]], [[Kelly-087]] and [[Linda-058]] — and deploys immediately to Gamma Halo.{{Ref/Reuse|escalation8}}
'''July 26'''
*After arriving at Gamma Halo, Blue Team find the bodies of the deceased science team and Team Black. After a short firefight with [[Promethean Knight]]s, Blue Team discovers the former location of the Composer. Upon entering the structure, the Spartans discover the [[Composer's Abyss]], at the end of which they find the slipspace portal leading to the Composer's Forge.{{Ref/Reuse|escalation8}}
*Blue Team enter the portal to the Composer's Forge where they discover six Composers. The Didact confronts the Spartans along with a newly-created army of Promethean constructs.{{Ref/Reuse|HE9}}
*During the ensuing battle, Static Carillon transports Installation 03 above the Composer's Forge as part of an agreement between himself and the Didact. The Didact takes one of the Composers and departs for Gamma Halo, planning to use the ring to wipe out humanity. However, the monitor feels betrayed by the Didact bringing his "abominations" to the Composer's Forge and helps Blue Team return to the portal in pursuit of the Didact, intending to close the portal behind them.{{Ref/Reuse|HE9}}
*As Blue Team returns to the surface of Gamma Halo, they are attacked and easily subdued by the Didact. Before the Forerunner can execute the Spartans, 859 Static Carillon appears, disables the Didact and teleports him into the Halo's [[Control Room (Installation 03)|control room]]. John-117 follows the Didact into the control center where he enables Static Carillon to eject the segment of the ring housing the control room. The detached section of the Halo plunges into the Composer's Forge; the Didact is consumed by the ensuing blast while the Master Chief is safely teleported aboard Blue Team's Longsword in orbit.<ref name="escalation10">'''Halo: Escalation''' - ''[[Halo: Escalation Issue 10|Issue #10]]''</ref>
'''July 24-July 26'''
*[[Battle of Installation 03]]: Jul 'Mdama's Covenant assault Installation 03 and take control of the site known as the [[Altar]] in order to use the [[Conduit]] to enable a massive Promethean invasion of the Halo through slipspace portals. However, a Spartan [[unidentified Headhunter|Headhunter]] assaults the Altar and obtains the Conduit.<ref>'''[[Halo: Spartan Strike]]''', ''[[Operation C: Valiant Hammer]]''</ref>
*[[Battle of New Phoenix]]: Shortly after the composition of New Phoenix, 'Mdama's Covenant open portals in [[New Phoenix ONI facility|an ONI base]] in the city through a [[unidentified Forerunner machine|Forerunner artifact]] stored there with the intent of launching an all-out invasion of Earth. The UNSC is able to stop the attack using the Conduit.<ref>'''Halo: Spartan Strike''', ''[[Operation D: Adamantine Shield]]''</ref>
*859 Static Carillon takes Installation 03 to an unknown location for repairs.{{Ref/Reuse|escalation10}}
'''July 27'''
*Blue Team returns to Earth; John-117 is debriefed by Admiral Hood, who congratulates him on defeating the Didact. However, the Master Chief believes the Didact is not dead, but merely "contained". While Hood suggests that he and Blue Team stand down and have some rest, the Master Chief instead leads the team on a new mission.{{Ref/Reuse|escalation10}}

===September===
'''September 12'''
*Rooker begins to suffer from rampancy due to being six months past his "expiration date". Feeling he can no longer manage the ''Argent Moon'', he initiates his own destruction.{{Ref/Reuse|blue team intel}}
'''September 26'''
*Two months after [[Cortana]]'s supposed death, [[Beta-5 Division]] operative [[Sapphire Three]] interviews [[John-117]] regarding his visions of and interactions with the [[AI]] in late [[2552]].<ref name="DD">'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #9]]''</ref>

===November===
'''November 15'''
*The holiday known as "[[Yanumas]]" is celebrated for the first time.<ref name=misc1>[http://onisection3.enjin.com/forum/page/9/m/9298795/viewthread/4839253-irc-chatlog-feel-free-to-update-periodically/filter/most-views '''Section 3 Old Chat Record''' ''Page 99'']</ref>

===December===
'''December 5'''
*[[Roland]] becomes ''Infinity''<nowiki>'</nowiki>s primary shipboard [[Artificial intelligence|AI]].<ref name="VIS">'''[[Halo 4: The Essential Visual Guide]]'''</ref>{{Ref/Book|Id=Enc22P108|Enc22|Page=108}}
*[[Gek 'Lhar]] carries out a [[Terrorism|terrorist]] attack on Earth; he is detained and sent to [[Midnight Facility]] for interrogation.<ref>[https://www.halowaypoint.com/en-us/forums/db05ce78845f4120b062c50816008e5d/topics/i-wish-343i-would-of-done-more-with-gek-lhar/89828287-a7a6-4b7d-ad31-a7f985eed1c0/posts?page=1#post12 '''Halo Waypoint''': ''I wish 343i would of done more with Gek Lhar'']</ref>
*An ONI analyst sends a warning memorandum to [[UNSC High Command]] regarding growing threats of Kig-Yar pirates near key trade routes. The UNSC disregards ONI's repeated requests for official action against the Kig-Yar.<ref>'''[[Halo: Escalation]]''', ''[[Halo: Escalation Issue 12|Issue #12]]''</ref>

===Unknown date===
*The [[CYPHER-class Mjolnir]] enters mass production by [[Imbrium Machine Complex]].<ref>'''[[Halo 5: Guardians]]''', ''CYPHER-class Mjolnir (Body description)''</ref>
*A [[Composer]] is extracted from [[Installation 03]] by the {{UNSCShip|Infinity}} and taken to [[Ivanoff Station]].<ref>[https://www.youtube.com/watch?v=kFMOC8cak0k '''The Sprint''': ''Season 3 - Episode 5'']</ref>
*The [[List of REQ cards/Weapon Skins|Ruptive]] skin for the [[M395B DMR]], [[MA5D assault rifle]], [[BR85N battle rifle]], [[M20 SMG]], and [[M6H magnum|M6H2 magnum]] is approved by the [[UNSC Ordnance Commission]].
*The [[M820 Scorpion]] main battle tank is introduced.<ref name="universe">[https://www.halowaypoint.com/en-us/universe/VEHICLES/SCORPION '''Halo Waypoint''': ''Scorpion'']</ref>
*The ''[[Eden Rising]]'', transporting a UNSC research team, arrives at [[Installation 00]] via the Forerunner [[Portal at Voi|portal]] in [[Voi]]. Soon after their arrival, the UNSC establishes a [[Henry Lamb Research Outpost|new outpost]] and activates dormant [[Retriever Sentinel]]s in order to start repairing the damaged Ark.<ref>'''[[Halo Wars 2]]''', ''[[Phoenix Logs]]'', "Henry Lamb Research Post"</ref>
*The [[D79-TC Pelican]] began to replace the aging [[D77-TC]] airframes.<ref name="waypointarticle">[https://www.halowaypoint.com/en-us/universe/vehicles/pelican '''Halo Waypoint''': ''Pelican'']</ref>
*The [[Alluvion Research Center]] is lost to the waves of the [[Sundark Sea]] on [[Alluvion]].<ref name="halowayp">[https://www.halowaypoint.com/en-us/universe/locations/alluvion '''Halo Waypoint:''' ''Universe - Locations - Alluvion'']</ref>
*[[Veta Lopis]]'s [[Ferret]] team is declared [[Missing in action]] and presumed dead around this year.{{Ref/Novel|Id=Chapter 21|HSoR|Chapter=21}}
*The [[Swords of Sanghelios]] launched an assault on [[Hesduros]] with the intent of killing 'Mdama and destroying his Covenant for good, devestating multiple redoubts and forcing Mdamas covenant to abandon Hesduros.{{Ref/Novel|Id=LoO5|LoO|Chapter=5}}

==Sources==
{{Ref/Sources}}