Editing Requiem Campaign

{{Status|Canon}}
{{Battle infobox
|name=Requiem Campaign
|prev=[[Assassination of Avu Med 'Telcam]]
|next=[[Attack on Ealen IV]]
|image=[[File:HM-Requiem Campaign.jpg|300px]]
|conflict=[[Post-Covenant War conflicts]]
|date=[[2558#February|February 7]] – Sometime between [[2558#February|February 14]]-[[2558#February|18, 2558]]{{Ref/Generic|Id=IFB|[[Halo 4 Limited Edition]]|[[Infinity Briefing Packet]]}}
|place=[[Requiem]], [[Epoloch system]]
|result='''Indecisive'''
*Requiem and its system destroyed.
*Remaining Covenant vessels and UNSC ''Infinity'' escape.
*Each side acquires a separate half of the [[Janus Key]].
*Doctor Halsey defects to Jul 'Mdama's Covenant.
*The [[Librarian]]'s [[mind transfer|imprint]] sent to the [[Absolute Record]].
|side1=*{{Icon|UEG}} [[Unified Earth Government|UEG]]
**{{Icon|UNSC Post}} [[United Nations Space Command|UNSC]] 
*{{Icon|Forerunner}} [[Librarian#The Janus Key and the Absolute Record|Librarian Imprint's]] [[Sentinel]]s
|side2=*{{Icon|Didact}} [[Didact|Didact's]] [[Prometheans#Mechanical Prometheans|Prometheans]]
*{{Icon|Mdama}} [[Jul 'Mdama's Covenant]]
|commanders1=*[[Captain (Navy)|CAPT]] [[Thomas Lasky]]
*CAPT [[Cyrus Shaw]]
*[[Spartan Commander]] [[Sarah Palmer]]
*[[Librarian#The Janus Key and the Absolute Record|Librarian]]
|commanders2= *[[Supreme Commander]] [[Jul 'Mdama]]
*[[Commander (Covenant)|Commander]] [[Gek 'Lhar]]†
*[[Sangheili Warrior|Warrior]] [[Parg Vol]]†
|forces1=*[[Expeditionary Strike Group 1]]
**{{UNSCShip|Infinity}}
***10 internally docked {{Class|Strident|heavy frigate}}s
**3+ {{Class|Vindication|light battleship}}s{{Ref/Reuse|key}}
**[[F-41 Broadsword]]s
**[[D79H Pelican]]s
***[[G79H Pelican]]s
**Numerous stolen {{Pattern|Ru'swum|Phantom}}s
**[[M808C Scorpion]]s
**[[Mantis]]es
**[[M12G1 Gauss Warthog]]s
**[[M12R Rocket Warthog]]s
**[[M12 Chaingun Warthog]]s
**[[M274R Mongoose]]s
**~300 [[SPARTAN-IV program|Spartan-IV]]s
**[[UNSC Marine Corps|Marine Corps]] expeditionary personnel
**[[UNSC Army|Army]] expeditionary personnel
**[[UNSC Air Force|Air Force]] expeditionary forces
**[[Aggressor Sentinel]]s {{c|under [[Librarian]]'s influence}}
|forces2=
*Jul's Covenant fleet
**1+ {{Class|CAS|assault carrier}}
**2+ {{Pattern|Maugen|armored cruiser}}s
**Numerous {{Pattern|Zanar|light cruiser}}s
**1+ {{Pattern|Kmiro'sish|Lich}}
**Numerous {{Pattern|Ru'swum|Phantom}}s
**Numerous {{Pattern|Morsam|Seraph}}s
**Numerous {{Pattern|Is'belox|Banshee}}s
**1+ {{Pattern|Za'zayara|Harvester}}
**Numerous {{Pattern|Zurdo|Wraith}}s
**Numerous {{Pattern|Karo'etba|Ghost}}s
**Numerous [[Sangheili]]
**Numerous [[Unggoy]]
**Numerous [[Kig-Yar]]
**Numerous [[Lekgolo]]
*Thousands of Promethean infantry
**[[Promethean Crawler]]s
**[[Promethean Knight]]s
**[[Promethean Watcher]]s
|casual1=*At least 11 SPARTAN-IVs
**[[Fireteam Castle]]
**[[Cara Costabile]]
**[[Mountain Squad]]
*Many Marines
**[[Boa Squad]]
**[[Hawk Squad]]
*Many Army troopers
*At least [[Ryan Frank|one]] Air Force pilot 
*All Aggressor Sentinels
*3+ [[D79H Pelican|Pelicans]]
*1+ captured {{Pattern|Ru'swum|Phantom}} {{c|friendly fire}}
|casual2=*Many Promethean forces
*Many Covenant forces
**[[Parg Vol]]
**[[Gek 'Lhar]]
**Heavy infantry losses
**1+ {{Pattern|Maugen|armored cruiser}}
**Several {{Pattern|Zanar|light cruiser}}s
**Numerous {{Pattern|Ru'swum|Phantom}}s
**Numerous {{Pattern|Zurdo|Wraith}}s
**Numerous {{Pattern|Karo'etba|Ghost}}s
**1+ {{Pattern|Kmiro'sish|Lich}}
**1 {{Pattern|Za'zayara|Harvester}}
}}
{{Quote|The [[Jul 'Mdama's Covenant|Covies]]... they believe this is the home of [[Ur-Didact|one]] of [[Forerunner|their gods]]! Way I see it, if those freaks wanna meet God, it's our duty to help them along!|Sarah Palmer discussing Jul 'Mdama's Covenant presence on Requiem with the SPARTAN-IVs}}

The '''Requiem Campaign''',{{Ref/Comic|Id=esc|HE|Issue=13}} also known as the '''Second Battle of Requiem'''{{Ref/Site|URL=https://www.halowaypoint.com/en-us/universe/characters/henry-glassman|Site=Halo Waypoint|Page=Henry Glassman|D=13|M=04|Y=2016}} or the '''Requiem Conflict''',{{Ref/Site|URL=https://www.halowaypoint.com/en-us/universe/characters/tedra-grant|Site=Halo Waypoint|Page=Tedra Grant|D=13|M=04|Y=2016}} was the second, larger-scale [[battle|engagement]] fought on the [[Forerunner]] [[shield world]] [[Requiem]] in [[2558#February|February 2558]]. It was waged between the [[Promethean]]s and their [[Jul 'Mdama's Covenant]] religious followers and the returning [[United Nations Space Command]].

==Background==
{{Main|Battle of Requiem}}
Six months before the onset of the battle in [[2557#July|July 2557]], the [[Forerunner]] [[Promethean]] supreme commander known as the [[Ur-Didact|Didact]] had been inadvertently awakened from his [[Cryptum]] on Requiem and immediately initiated a campaign against humanity, which he saw as unworthy of taking on the [[Mantle]]. Revering the Forerunner as a living god, a [[Jul 'Mdama's Covenant|new "Covenant" faction]] under the leadership of [[Jul 'Mdama]], allied themselves with the Didact and his mechanical Promethean armies. The Didact was eventually [[New Phoenix Incident|defeated]] by [[SPARTAN-II program|Spartan]] [[John-117]] above [[Earth]], leaving the Prometheans without a leader, yet still hostile to humanity.

As the UNSC recovered from the attack on New Phoenix, Jul 'Mdama retained some control over the Prometheans and Requiem thanks to his alliance with the Forerunner Commander. As the Didact's Hand, Jul 'Mdama used his newfound authority to push aside any and all competing Sangheili warlords, manging to sway a significant number of formerly neutral Sangheili colonies to his side as Jul made preparations for a push for Sanghelios itself, hoping to take it from the Arbiter.{{Ref/Book|Id=Mythos|Mythos}}

With his Covenant now involved in several conflicts, Jul finally turned his attention to Requiem and prepared to return to the [[Shield World]] in full force, not only to pillage Requiem for weapons and technology, but use it to draw humanity into a fatal trap. The Covenant supreme commander leaked word of his plans for Requiem to human intelligence services, and prepared to draw the UNSC into a grinding war of attrition. Jul also seeked to use the war against the UNSC to cement his hold over his newfound Covenant, while also allowing him the opportunitu to sacrifice those whose loyalty was suspect. As a result, the {{UNSCShip|Infinity}}, the most advanced warship in the [[UNSC Navy|Navy]], was dispatched to establish research facilities on the Forerunner construct and eliminate any opposition from the occupying Promethean and 'Mdama's Covenant forces.{{Ref/Reuse|Mythos}}{{Ref/SpOps|Id=s1e1|Departure}}

==Battle==
===''Infinity's'' return===
In [[2558#February|February 2558]], the {{UNSCShip|Infinity}} returned to Requiem, destroying an {{Pattern|Maugen|armored cruiser}} immediately upon arrival. {{Class|Strident|heavy frigate}}s were deployed to protect the ship and establish a position in orbit. SPARTAN-IV fireteams were sent into Requiem to support the Marine, Army, and Air Force assets deployed within the shield world.{{Ref/Reuse|s1e1}} UNSC forces set up several research bases: [[Copernicus Base]], [[Galileo Base]], and [[Magma Base]]. Other locations, such as areas designated "[[Quarry]]", "[[Fortress (location)|Fortress]]", and "[[Sniper Alley]]", were often contested for control.

During an interception on one of 'Mdama's Covenant archaeological dig sites, [[Fireteam Crimson]] discovered one of the three [[Requiem slipspace artifacts]] on Requiem in "[[the Cauldron]]".{{Ref/Reuse|s1e1}} The artifact was brought onboard ''Infinity'', where it was examined by [[Henry Glassman]].{{Ref/SpOps|Id=s1e2|Artifact (Spartan Ops)|EpisodeLinkText=Artifact}} Glassman, who accidentally activated it, was translocated to Requiem and became a prisoner of 'Mdama's Covenant. There, he was brought to Jul 'Mdama and was forced to find a method to activate the device containing the Librarian AI in "[[Librarian's Rest]]". Captain Lasky requested Doctor [[Catherine Halsey]] to be brought onboard ''Infinity'' to study the artifact. Halsey found out that the artifact was communicating with the ship's system's, notably the engine, and transmitting signal to a location in Requiem. On Requiem, Sangheili terrorist [[Parg Vol]], an associate of 'Mdama, was hunted and eventually [[Assassination of Parg Vol|assassinated]] by Fireteam Crimson. During [[Skirmish at Two Giants|another engagement]], a {{Pattern|Zanar|light cruiser}} was destroyed by ''[[Infinity Sub-Vessel 3]]'' while it was meeting Crimson who were investigating a Forerunner structure at "[[Two Giants]]".{{Ref/SpOps|Id=s1e3|Catherine}}

===Jul 'Mdama's plan===
During their flight to [[Copernicus Base]], [[Fireteam Castle]] was shot down by Covenant forces led by Jul 'Mdama. This attack drew ''Infinity's'' attention to hunt down 'Mdama. UNSC scientists had discovered that 'Mdama's Covenant were using Requiem's portal systems, and Fireteam Crimson was deployed to assist in the investigation. Incidentally, 'Mdama was detected traversing through the portals, so Fireteam Majestic and Crimson were sent to give chase. After discovering a way to activate Requiem's portal systems, Crimson followed 'Mdama to "the Cauldron", where he purposely left an artifact known as the "[[Didact's Gift]]" for Crimson, prompting the team to bring the artifact to [[Galileo Base]].{{Ref/SpOps|Id=s1e4|Didact's Hand}}
[[File:Majestic - 3.png|thumb|250px|left|Fireteam Majestic recovering the "Didact's Gift" from Galileo Base.]]
Jul 'Mdama's Covenant then staged [[Battle of Galileo Base|an attack]] on the base to show that they were attempting to recover the artifact. While Fireteam Crimson defended the base, Fireteam Majestic extracted "the [[Didact's Gift]]" and brought it back to ''Infinity'', where it was analyzed by Halsey. By giving Halsey the "soul of a Promethean Knight", 'Mdama had gained Halsey's interest in cooperating to find the Librarian. Their partnership, however, was discovered by Captain Lasky and Commander Palmer, who then took Halsey into custody. Spartan [[Gabriel Thorne]], during his examination of the artifact, was taken to Requiem like Glassman. On Requiem, 'Mdama's Covenant and Promethean forces [[Battle at The Refuge|attacked]] UNSC research bases "[[The Refuge (Requiem location)|the Refuge]]" and Magma Base, but both of these attacks were successfully repelled by [[Fireteam Crimson]] with the assistance of [[Fireteam Shadow]] in "the Refuge," resulting in the destruction of another cruiser. Additionally, the UNSC gained vital intelligence on Requiem's portal system and was able to control it before Crimson destroyed a device at "the Refuge" that allowed the portals to open in order to limit the movement of 'Mdama's Covenant and Prometheans. During their search for Spartan Gabriel Thorne in the Quarry, members of Crimson were captured by 'Mdama's Covenant forces.{{Ref/SpOps|Id=s1e5|Memento Mori}}

Spartan Thorne was captured by Jul 'Mdama's Covenant and was brought to where Glassman was. Glassman, on the other hand, managed to activate the Librarian's device, and used the opportunity to escape. Glassman's escape distracted the Sangheili who took Thorne prisoner, giving Thorne the chance to retaliate. Together, the duo ran away, heading for Galileo Base, being chased by a vengeful [[Gek 'Lhar]]. At the same time, Fireteam Crimson also [[Escape from Lockup|escaped]] 'Mdama's Covenant and hijacked a Phantom in the process. Using the captured Phantom, Crimson was able to infiltrate Covenant bases [[First Raid on Control|at]] "[[Control]]" [[Raid on the Warrens|and]] the "[[Warrens]]" where they hacked into 'Mdama's Covenant systems and uncovered vital intel on a nearby Covenant supply depo and [[Harvester (location)|an archeological dig]]. Crimson [[Raid on Cyclone|attacked]] and destroyed the supply depot at "[[Cyclone]]," discovering in the process [[HAVOK tactical nuclear weapon|HAVOK nuclear missiles]] missing their warheads while [[Fireteam Switchback]] was sent to disable a  [[Za'zayara-pattern Harvester|Harvester]] at the archeological dig site. After Switchback disappeared, Crimson was sent to [[Raid on Harvester|investigate and ensure that the Harvester was permanently disabled]]. Crimson only found Switchback's blank [[IFF]] tags and destroyed two consoles aboard the Harvester to ensure its permanent disabling.{{Ref/SpOps|Id=s1e6|Scattered}}

===Second attack on the ''Infinity''===
{{Main|Invasion of the UNSC Infinity}}
[[File:Infinity - Prometheans.png|thumb|250px|left|Promethean Knights boarding ''Infinity'']]
Meanwhile, as Dr. Halsey sat in the brig of the {{UNSCShip|Infinity}}, Roland appeared and asked why she attempted to communicate with an unknown intelligence about classified material. After a brief interchange, Halsey used the passphrase override "undid iridium" to gain control of the AI and then use him to move unsuspected to the captain's ready room. Once there she perused all the material she could find for information on the Librarian and Jul 'Mdama, also discovering that [[John-117]] was still alive and had survived the [[Battle of Installation 00|destruction]] of [[Installation 00]]. She then used the terminal to communicate with Jul 'Mdama. She offered her assistance in exchange for what they both wanted: the Librarian's secrets. At that moment, though, Roland regained control of his confused matrices, pulled the plug, and immediately alerted Lasky. Just as the captain was about to have Halsey interred in a [[cryo chamber|cryo tube]], alarms sounded across the ship: the Prometheans had gained access to the ''Infinity'' and taken all hands by surprise. Most Spartan and Marine fireteams were deployed on Requiem and the Prometheans quickly overran most of the ship. All UNSC assets were recalled to the ship, but at that moment the rest of 'Mdama's Covenant fleet arrived, composed primarily of {{Pattern|Zanar|light cruiser}}s, and attacked the ''Infinity''.{{Ref/SpOps|Id=SO7|Invasion (Spartan Ops)|EpisodeLinkText=Invasion}}

At this point, Fireteam Crimson reached the battle, still in the captured Phantom. ''Infinity's'' automated point-defense turrets could not differentiate between the thousands of incoming enemy spacecraft and Crimson was hit. Lieutenant Murphy barely guided the out-of-control dropship into one of ''Infinity's'' hangars, the bay's vacuum shields decelerating the dropship enough to allow all of its passengers to survive. Fireteam Crimson promptly went to work, clearing the hangar. However, interference from the artifact prevented Roland from closing the bay doors so Crimson was forced to power cycle the Server Room and reboot the ship-wide data link before the hanger bay could be fully secured. At that moment though, teams on board made two discoveries: Jul 'Mdama's Covenant had internally disabled the all port defenses, leaving ''Infinity'' open to attacks from 'Mdama's Covenant fleet, and that 'Mdama's Covenant had stolen UNSC [[HAVOK tactical nuclear weapon]]s and had armed the warheads in the Server Room and the Engine Room. Despite 'Mdama's Covenant protecting the warheads with [[active camouflage]], Fireteam Crimson, managed to disarm all [[seven]] and secure both rooms. With the nukes disarmed and back in UNSC control, Crimson reactivated the ship's port defenses, which promptly destroyed all adjacent ships, including at least one light cruiser. The remainder of 'Mdama's Covenant fleet fled as the UNSC regrouped and repelled the remaining boarders.{{Ref/Reuse|SO7}} But the ''Infinity'' was not safe yet. As Lasky escorted Halsey to the bridge, it was brought to his attention that ''Infinity'' was unable to move from its current spot because it was trapped by [[interdiction web|a sort of Slipspace anchor]]. As he turned his back, a Promethean Knight appeared, knocked Commander Palmer to the deck, grabbed Dr. Halsey, and disappeared again.{{Ref/SpOps|Id=SO8|Expendable}}

[[File:Majestic - 4.jpg|thumb|250px|left|Fireteam Majestic arrive in time to save Thorne and Glassman.]]
As the massive battle waged hundreds of miles over their heads, Spartan Thorne and Dr. Glassman [[Escape from Librarian's Rest|trekked]] through the dusty canyons near "[[Sniper Alley]]" to reach [[Galileo Base]]. Glassman sat down to take a rest and Thorne stopped to glance around. Realizing that something was amiss, he told Glassman to get to safety just as [[Gek 'Lhar]] emerged from invisibility, swinging his energy sword and slicing Thorne's Storm Rifle in half. Gek tossed Glassman aside like a ragdoll and attempted to truncate Thorne, who disarmed him in the process. Thorne managed to knock the Elite assassin to the ground. The Spartan then tried to break Gek's skull with a boulder, but the Elite caught it, flipped Thorne to the ground and brought the stone down on his chest and head, stunning him. Glassman was attempting to reach the fallen energy sword, but was stopped when Gek stepped on his outstretched arm, breaking it. Just as the Elite was preparing to execute the downed Spartan, he was shot in the head three times by DeMarco, who had shown up with the rest of Majestic. The Spartans looted his body, taking Gek's [[Type-1 energy sword|energy sword]] and [[active camouflage]] module before [[Madsen]] located a map of Requiem.{{Ref/Reuse|SO8}}

===Disrupting Covenant Operations===
Following the end of the attack on the {{UNSCShip|Infinity}}, the human forces were redeployed to continue disrupting 'Mdama's Covenant operations on the planet. Having been interrupted in [[Skirmish at Apex|their mission]] to deactivate the portals at "[[Apex]]" and capture the site by the attack on the ''Infinity'',{{Ref/SpOps|Expendable|Backup}} [[Fireteam Crimson]] were [[Raid on Apex|sent back]] to "Apex" to complete their original mission and secure the area. Crimson succeeded in closing the portals and ''Infinity'' sent [[Fireteam Lancer]] to hold "Apex". In addition, Spartan [[Jared Miller]] picked up an SOS coming over 'Mdama's Covenant frequencies in Morse code.{{Ref/SpOps|Expendable|Unfinished Business}} Getting a distress call from [[Fireteam Majestic]], Crimson and [[Fireteam Kodiak]] were sent to "[[Cyclone]]" to [[Assault on Cyclone|take down]] three Covenant [[Ra'aam-pattern burst cannon|plasma artilleries]] stationed there that Majestic was under fire from. During the mission, 'Mdama's Covenant displayed an inexplicable ability to predict the UNSC's movements.{{Ref/SpOps|Expendable|Majestic Rescue}}

With Fireteam Lancer having discovered a nest occupied by Jul 'Mdama's Covenant in the "[[Warrens]]" near "Apex," Crimson was sent to aid Lancer in [[Assault on the Warrens|taking out the Covenant position]]. Fighting through 'Mdama's Covenant base, the SOS was detected again and Crimson followed it to the imprisoned [[Fireteam Switchback]] who had mysteriously vanished while disrupting [[Harvester (location)|one of 'Mdama's Covenant dig sites]]. Crimson and Lancer rescued Switchback while elsewhere [[Poker Squad]] captured a wounded [[Sangheili]] who offered up the location of one of 'Mdama's Covenant listening posts in exchange for his own life. After extracting Crimson and Switchback, [[Sarah Palmer]] ordered Crimson redeployed to destroy the listening post.{{Ref/Reuse|lancer}} Crimson returned to "[[Lockup]]" where the Sangheili revealed 'Mdama's Covenant listening post was. [[Raid on Lockup|Fighting]] their way through 'Mdama's Covenant forces stationed there, Crimson discovered a captured [[UNSC Army|Army]] [[D79H Pelican|Pelican]] that had been shot down in "[[the Cauldron]]" and thought destroyed. 'Mdama's Covenant were able to tap into the Pelican's communications systems and use them to spy on UNSC comm traffic, explaining their inexplicable ability to predict the UNSC's movements. Crimson deactivated the energy tethers hooked into the Pelican's communications systems and [[Robert Dalton]] conducted an orbital strike on the Pelican, destroying it and permanently depriving the Covenant of their ability to spy on the ''Infinity's'' communications with her forces.{{Ref/SpOps|Expendable|Crystal Ball}}

Believing that the map [[Anthony Madsen]] had recovered from [[Gek 'Lhar]] could hold the key to freeing ''Infinity'' from Requiem, Dr. [[Henry Glassman]] had Crimson [[Second Raid on Control|redeployed]] to "[[Control]]" to test his ability to read the map. Glassman guided the fireteam in activating Forerunner heavy weapon caches, [[Z-510 focus turret|beam turrets]] and [[Z-8250 heavy artillery|anti-aircraft guns]]. With the help of the activated defenses, Crimson destroyed several [[Ru'swum-pattern Phantom|Phantoms]] and wiped out 'Mdama's Covenant forces in the area, proving Glassman's interpretation of the map to be correct.{{Ref/SpOps|Expendable|Glassman}} Shortly thereafter, Glassman, still on Requiem with Fireteam Majestic, was extracted back to ''Infinity'' by a Pelican.{{Ref/Reuse|key}}

===The Janus Key and Halsey===
[[File:HTMCC-H4 SO JanusKeyDisplay.png|thumb|250px|left|Dr. Catherine Halsey meets the Librarian in the shrine at "Librarian's Rest".]]
With the abduction of Dr. [[Catherine Halsey]] by enemy forces, [[Admiral]] [[Serin Osman]], head of the [[Office of Naval Intelligence]], ordered Lasky to assassinate the doctor before 'Mdama's Covenant could glean any sensitive intel from her. Sarah Palmer was deployed from ''Infinity'' despite Lasky's admonishments to the contrary. As soon as she was out of earshot, Lasky contacted [[Fireteam Majestic]] and asked them to rescue Dr. Halsey without telling them that Palmer was en route. The Spartans returned to 'Mdama's Covenant's base and [[Skirmish at Librarian's Rest|engaged]] the sentries outside while Thorne used his recently-acquired cloaking unit to slip inside. At the same time, Dr. Halsey unlocked the shield set up by Glassman and entered the Librarian's shrine. Inside she was greeted by the [[Librarian]]'s [[mind transfer|imprint]], which presented to her the two pieces of the [[Janus Key]], an artifact that would reveal the location of every piece of Forerunner technology in the galaxy. Once she reappeared outside the shrine, Jul 'Mdama snatched one of the halves away from her, not noticing the second piece in Halsey's hand. At that moment Thorne broke a nearby sentry's back, killing the other with his assault rifle. Halsey tossed the other half of the Janus Key to Thorne. Just as a sword-wielding warrior was about to kill him from behind, it was felled by Palmer. A pair of Promethean Knights appeared to protect 'Mdama and Halsey, but not before Palmer shot the doctor in the left shoulder. The rest of Majestic appeared and fought through the army of Prometheans alongside Palmer. Before they could reach the cornered 'Mdama, a Knight appeared and teleported away with him and the injured doctor.{{Ref/SpOps|Id=key|Key}}

Following Halsey's abduction, ''Infinity'' dispatched all fireteams from both ''Infinity'' itself and three {{Class|Vindication|light battleship}}s to search for her. [[Fireteam Crimson]] was [[Battle of Cyclone|dispatched]] to "[[Cyclone]]" where Halsey had been routing communications through the area before she was snatched. With the help of beam turrets and [[Aggressor Sentinel]]s under the Librarian's control, Crimson was able to access 'Mdama's Covenant data terminal with the Librarian aiding Roland and Dr. [[Lani Truman]] with the decryption as she prepared to transmit herself to the [[Absolute Record]]. Both the decryption and transmission became stalled at 99%, resulting in Crimson opening the breaker on the power source in the area. The Librarian's imprint was broadcast to the Absolute Record in the form of a massive data stream while Halsey's signal was determined to have bounced to "[[Control]]".{{Ref/SpOps|Id=tsfh|Key|The Search for Halsey}} At "Control", where [[Boa Squad]] had been wiped out by 'Mdama's Covenant, Crimson fought off the occupying forces and activated the comm terminals in the area. 'Mdama's Covenant received backup in the form of Prometheans, but Crimson was able to hold them off long enough for Roland to determine that the signal next bounced to "[[Apex]]". Once Crimson got to a safe location, [[Robert Dalton]] commenced an aerial bombardment of "Control," wiping out the remaining Promethean forces.{{Ref/SpOps|Key|Clean Up}} At "Apex," Crimson discovered the area protected by multiple Covenant shields and heavily fortified by infantry troops supported by [[Ru'swum-pattern Phantom|Phantoms]]. Using [[M808C Scorpion|Scorpion tanks]], Crimson fought through the occupying forces of 'Mdama's Covenant and Prometheans, allowing Roland to determine the signal next bounced to "[[Lockup]]".{{Ref/SpOps|Key|Science Mountain}}

When Crimson arrived at "Lockup," they faced off against Jul 'Mdama's fierce resistance including Ghosts, Wraiths and Hunters. Following the signal being emanated by [[IFF]] tags, Crimson fell into 'Mdama's Covenant trap, but managed to fight their way out of it. Crimson succeeded in clearing the area, but 'Mdama's Covenant and Prometheans sent further reinforcements to "Lockup".{{Ref/SpOps|Key|Revenge}} Crimson managed to eliminate the initial waves of Prometheans and assist [[Poker Squad]] in fighting off more attackers. With Poker Squad safe, Crimson was sent to find [[Hawk Squad]] whose IFF tags were detected nearby. The signal eventually lead Crimson to a [[gravity lift]] the UNSC was never able to activate before leading to the roof of the main structure. On the roof, Hawk Squad's IFF tags were found, revealing that they were being used by 'Mdama's Covenant forces as [[Reclaimer]]s in an attempt to activate a Forerunner device. After they couldn't activate it, the [[Sangheili]] killed them in frustration. With the device being where Halsey's signal ended up before bouncing off into [[proselytization network|'Mdama's Covenant battlenet]], Crimson activated the device while fighting off more of 'Mdama's Covenant and Promethean forces. The Forerunner device proved to be a large map of Requiem which, combined with the map recovered from [[Gek 'Lhar]], was believed by Roland to possibly be the key to freeing ''Infinity'' from Requiem. With the search for Halsey having reached a dead end, Crimson was extracted from the area.{{Ref/SpOps|Key|The Hammer}}

===Requiem's end===
[[File:Requiem destruction.png|thumb|250px|Requiem and it's sun are destroyed in the conclusion of the battle.]]
Believing to have obtained what they were looking for, [[Jul 'Mdama]] activated Requiem's [[self-destruct]] system which set the [[shield world]] to collide with its sun. All of 'Mdama's Covenant ships were ordered to evacuate from Requiem; the crew of ''Infinity'' took note of this mass exodus and soon realized that Requiem was steadily moving towards the system's star. ''Infinity'' could not move, being still firmly anchored to the shield world due to [[interdiction web|the anchor]] generated by [[Requiem slipspace artifacts|the slipspace artifact]] on board resulting in the ship getting pulled along with Requiem towards the sun. Using the map obtained by [[Fireteam Majestic]] from [[Gek 'Lhar]], Dr. [[Henry Glassman]] was able to determine that there were three artifacts generating the anchor and that deactivating the two located on Requiem would set the ship free. Commander [[Sarah Palmer]] decided to take Fireteam Majestic after one artifact while sending [[Fireteam Crimson]] after the other. As Requiem got closer to its sun, the planet began experiencing frequent earthquakes from the gravitational disturbance created by the sun causing the shield world to begin shaking itself apart.{{Ref/SpOps|Id=Exodus|Exodus (Spartan Ops)|EpisodeLinkText=Exodus}}

Following the coordinates from the map, Crimson was redeployed to [[Harvester (location)|the area]] where they had previously stopped 'Mdama's Covenant archeological dig. Eliminating 'Mdama's Covenant forces around the area, Crimson discovered that the coordinates pointed to inside of a rock wall and realized that the excavation they had interrupted was to find the artifact. With the artifact beyond their reach, Spartan [[Jared Miller]] decided to reactivate the disabled [[Za'zayara-pattern Harvester|Harvester]] and use its [[plasma drill]] to bore a hole through the rock. However, Covenant drop pods deployed more troops while the Harvester, which had been retaken by 'Mdama's Covenant, had an energy shield protecting its entrance. While Crimson required air support to blast through the shield, anti-air defenses in the area prevented that. Though the weapons were shielded, [[Roland]] managed to take down the shields, allowing Crimson to destroy the guns. [[Lieutenant]] [[TJ Murphy]] was able to take out the shield with a Pelican's guns and Crimson were able to board the Harvester, eliminate the crew and rescue several scientists who had been kidnapped by 'Mdama's Covenant to repair the Harvester. However, Dr. [[Dennis Russell]] revealed that the Harvester's power supply had been destroyed and the Harvester was inoperable. Roland was able to come up with a plan to retrieve a replacement power supply for the Harvester and had Crimson extracted.{{Ref/SpOps|Exodus (Spartan Ops)|EpisodeLinkText=Exodus|Artifact}}

On Roland's direction, Crimson was sent back to "[[Apex]]" to get the power supply, but due to the anti-air defenses being too heavy, Crimson was instead dropped in the "[[Warrens]]" to make their way to "Apex" through an alternate route. Outside the main cavern, Crimson was aided by an [[orbital bombardment]] sent in by [[Robert Dalton]]. Battling 'Mdama's Covenant and Promethean forces, Crimson was forced to activate three energy sources in the "Warrens" to overload a locked door, but managed to make it to "Apex".{{Ref/SpOps|Exodus (Spartan Ops)|EpisodeLinkText=Exodus|In One Way}} In "Apex," Crimson met up with [[Fireteam Forest]] whose Pelican had been shot down in the area and the two fireteams combined forces, using [[M12G1 Gauss Warthog|Warthogs]] to push up "Apex" towards a structure indicated by Roland. After taking down the shield generators blocking off the structure and eliminating 'Mdama's Covenant and Promethean forces, Crimson activated a Covenant comm terminal which set off an alarm that drew a [[Kmiro'sish-pattern|Lich]] to the area. Roland revealed his plan to be to steal the Lich's engine core to replace the Harvester's power supply. Crimson and Forest managed to eliminate all the forces dropped by the Lich which eventually retreated to a cliffside to pepper the area with turret fire. Crimson managed to board the Lich and steal the power supply, destroying the Lich in the process. With the area still too dangerous for Pelican evac, Crimson retreated to the "Warrens" using the available vehicles in the area to escape the same way they came in.{{Ref/SpOps|Id=Seize the Power|Exodus (Spartan Ops)|EpisodeLinkText=Exodus|Seize the Power}} In the "Warrens," with the quakes getting worse, Crimson was forced to contend with 'Mdama's Covenant and Promethean forces, aided by [[HRUNTING/YGGDRASIL Mark IX Mantis|Mantises]] from crashed Pelicans. With the "Apex" guns active and preventing a Pelican extraction as well as an energy shield blocking the way out, Crimson destroyed the three energy sources they had activated on their previous trip through the area, disabling the shields and guns. After eliminating 'Mdama's Covenant forces on the beach outside, including Wraiths, Crimson was extracted to finish their mission to shut down the artifact.{{Ref/SpOps|Exodus (Spartan Ops)|EpisodeLinkText=Exodus|Out the Other}}

Returning to the artifact site, Crimson battled their way back onto the Harvester which had once again been retaken by Jul 'Mdama's Covenant. By this point, Requiem was starting to fall apart with pieces of the outer shell crashing to the inner surface and ''Infinity'' had evacuated all forces but Fireteam Crimson and Fireteam Majestic. After eliminating the minimal crew, Crimson used the Lich's stolen power supply to restore power to the Harvester. Using the Harvester's plasma drill, Crimson bored a hole through the rock wall into the cavern system beyond where the artifact they were after was located in a hidden Forerunner structure. Fighting through defending Promethean forces, Crimson was finally able to enter the structure and deactivate the artifact. As Requiem grew dangerously close to the sun, localized gravity fluctuations started affecting the shield world's surface. Near the exit, Crimson encountered some religiously devoted [[Sangheili]] who were determined to reactivate the artifact. Crimson eliminated the Sangheili and were extracted by Murphy's Pelican outside to a make an escape from the falling apart planet.{{Ref/SpOps|Exodus (Spartan Ops)|EpisodeLinkText=Exodus|One Last Time}}

At the same time Crimson was fighting to deactivate their artifact, Palmer and Fireteam Majestic fought to reach and deactivate the other one. By the time Crimson's artifact was deactivated, the Spartans had managed to reach the structure containing the remaining artifact, but faced determined 'Mdama's Covenant forces who continued to try to prevent them from freeing ''Infinity'' despite being left behind to die with Requiem. Palmer and Majestic managed to eliminate the remaining enemy forces and [[Gabriel Thorne]] deactivated the artifact. On ''Infinity'', the third artifact rose from where it had been stuck to the floor, showing its deactivation and Lieutenant [[James (lieutenant)|James]] discovered that the ship was now free to move once more. After Crimson and Majestic's Pelicans made a rough but safe landing, ''Infinity'' quickly fled Requiem and jettisoned the artifact into the sun. Requiem was consumed by the sun which then went [[supernova]]. ''Infinity'' made an emergency [[slipspace]] jump to avoid the supernova, followed through the jump by some of the sun's plasma. Though injuries were reported on all decks when the ship exited slipspace, the crew suffered no major casualties and celebrated their successful escape.{{Ref/Reuse|Exodus}}

==Aftermath==
{{Quote|Not only would Requiem and the important history it possessed be lost forever, but many Spartans would sacrifice their lives during the occupation.|[[Curator]] on the Requiem Campaign{{Ref/Book|Id=Mythos180|Mythos|Page=180}}}}
With one half of the Janus Key in possession of each belligerent, the artifact remained divided and could thus not be used for its intended purpose. Aboard ''Infinity'', Lasky and Palmer joined Dr. Glassman as he studied one half of the Key. Meanwhile, Dr. Halsey—now missing her left arm—seemingly agreed to collaborate with Jul 'Mdama, claiming that she wanted revenge.{{Ref/Reuse|Exodus}}

==Engagements==
{{Engagements in the Requiem Campaign}}

==Timeline==
===February 8===
*[[Operation: ALL-SEEING EYE]] takes place.{{Ref/Generic|Id=IFB|[[Halo 4 Limited Edition]]|[[Infinity Briefing Packet]]}}

===February 9===
*[[Operation: CHATTERBOX]] takes place.{{Ref/Reuse|IFB}}
===February 10===
*[[Operation: ACADEMIC]] takes place.{{Ref/Reuse|IFB}}
===February 11===
*[[Operation: THREE-CARD MONTE]] takes place.{{Ref/Reuse|IFB}}
===February 14===
*[[Battle at The Refuge|A battle]] takes place at [[The Refuge (Requiem location)|The Refuge]] concurrently with [[Operation: VERTICAL UMBRAGE]].{{Ref/Novel|Halo: Vertical Umbrage}}{{Ref/Site|Id=umbrage|URL=https://www.halowaypoint.com/news/halo-4-vertical-umbrage|Site=Halo Waypoint|Page=Halo 4 - Vertical Umbrage|D=7|M=11|Y=2022}}
==Participants==
{{Col-begin}}
{{Col-2}}
===UEG===
====Naval assets====
=====Starships=====
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Tactical grouping
! Class
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
| rowspan="2" | [[Expeditionary Strike Group 1]]
|{{Class|Infinity|supercarrier}}
|{{UNSCShip|Infinity}}{{Ref/Reuse|s1e1}}
|Survived
|-
|{{Class|Strident|heavy frigate}}
|''[[Infinity Sub-Vessel 3]]''
|Survived
|-
|Unknown
|{{Class|Sahara|heavy prowler}}
|{{UNSCShip|Aladdin}}
|Survived
|}
====Military Personnel====
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Branch
! Rank
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
| rowspan="4" |[[UNSC Navy]]
|[[Admiral]]
|[[Serin Osman]]
|Survived
|-
| rowspan="2" |[[Captain (NAVCOM)|Captain]]
|[[Thomas Lasky]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Cyrus Shaw]]{{Ref/SpOps|Catherine|Shootout In Valhalla}}
|Unknown
|-
|[[Lieutenant]]
|[[Austen]]
|Unknown
|-
|[[UNSC Air Force]]
|[[Airman]]
|[[Ryan Frank]]
|KIA{{Ref/SpOps|Id=thorne|Memento Mori|Spartan Thorne}}
|-
| rowspan="26" |[[Spartan Operations]]
|[[Spartan Commander]]
|[[Sarah Palmer]]{{Ref/Reuse|s1e1}}
|Survived
|-
| rowspan="25" |Spartan
|[[Anthony Madsen]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Bonita Stone]]{{Ref/Reuse|rundown}}
|Survived
|-
|[[Bradford Gale]]{{Ref/Reuse|lancer}}
|Unknown
|-
|[[Cara Costabile]]{{Ref/SpOps|Scattered|Search and Destroy}}
|KIA{{Ref/SpOps|Id=lancer|Expandable|Lancer}}
|-
|[[Carlo Hoya]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Carmichael]]{{Ref/SpOps|Id=ehgw|Memento Mori|Everything Has Gone Wrong}}
|Unknown
|-
|[[Casillas]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/SpOps|Id=hairy|Didact's Hand|Hairy Call}}
|-
|[[Dunlap]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/Reuse|hairy}}
|-
|[[Ernst Deming]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/Reuse|hairy}}
|-
|[[Estey-Bethel]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/Reuse|hairy}}
|-
|[[Fredric Zurenia]]{{Ref/SpOps|Id=sm|Catherine|Spartan Mountain}}
|KIA{{Ref/Reuse|sm}}
|-
|[[Gabriel Thorne]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Gustavo Esposito]]{{Ref/Reuse|Seize the Power}}
|Unknown
|-
|[[Holly Tanaka]]
|Survived
|-
|[[Horatio Fry]]{{Ref/Reuse|ehgw}}
|Survived{{Ref/Novel|Id=rubi|Halo: The Rubicon Protocol|Chapter=1}}
|-
|[[Jared Miller]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Lincoln]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/Reuse|hairy}}
|-
|[[Nina Kovan]]{{Ref/Reuse|rundown}}
|Survived
|-
|[[Paul DeMarco]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Robert Dalton]]{{Ref/SpOps|Id=lg|Departure|Land Grab}}
|Survived{{Ref/Reuse|Exodus}}
|-
|[[Scott Macrae]]{{Ref/Reuse|sm}}
|KIA{{Ref/Reuse|sm}}
|-
|[[Tashi]]{{Ref/Reuse|s1e4}}
|KIA{{Ref/Reuse|hairy}}
|-
|[[Tedra Grant]]{{Ref/Reuse|s1e1}}
|Survived
|-
|[[Terry Hedge]]{{Ref/Reuse|lancer}}
|Survived{{Ref/Twitter|Id=farewell|haruspis|1735449106749780252|Alex Wakeford|Quote=Have been greatly enjoying the reactions to Elena Bobrov and Terry Hedge returning from some incredibly obscure corners in Trial of Reckoning. Farewell, Halo 4 Mammoth driver and Fireteam Lancer’s leader 🙏|D=20|M=12|Y=2023}}
|-
|[[Jason Kidman]]{{Ref/Reuse|umbrage}}
|Survived 
|-
| rowspan="6" |[[UNSC Marine Corps]]
|[[Lieutenant]]
|[[TJ Murphy]]
|Survived{{Ref/Reuse|rubi}}
|-
|[[Staff Sergeant]]
|[[Elena Bobrov]]{{Ref/Site|Id=HIS5Intel|URL=https://www.halowaypoint.com/news/reckoning-intel|Site=Halo Waypoint|Page=Halo Infinite - Reckoning|D=4|M=2|Y=2024|LocalArchive=Halo Infinite Story & Intel}}
|Survived
|-
| rowspan="4" |[[Private]]
|[[Aasif Olsen]]
|Unknown
|-
|[[Antoine Lum]]
|Unknown
|-
|[[Gordon Smith]]
|Unknown
|-
|[[Tucker Corleone]]
|Unknown
|}

====Units====
=====Ground forces=====
*[[Spartan Operations]]
**[[Fireteam Avalanche]]
**[[Fireteam Castle]]
**[[Fireteam Crimson]]
**[[Fireteam Domino]]
**[[Fireteam Forest]]
**[[Fireteam Ivy]]
**[[Fireteam Kodiak]]
**[[Fireteam Lancer]]
**[[Fireteam Majestic]]
**[[Fireteam Shadow]]
**[[Fireteam Switchback]]
**[[Mountain Squad]]
*[[UNSC Marine Corps]]
**[[Boa Squad]]
**[[Hacksaw Squad]]
**[[Hawk Squad]]
**[[Icebreaker squad]]
**[[Poker Squad]]
**[[Warbird Company]]

====Vehicles====
*[[D79H Pelican]]
**''[[Pelican 653]]''†

===Artificial intelligence===
{{Main|Artificial intelligence}}
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
|[[Roland]]{{Ref/Reuse|s1e1}}
|Survived
|}

====Civilians====
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
|[[Cameron Alexander]]
|Unknown
|-
|[[Catherine Halsey]]
|Survived
|-
|[[Dennis Russell]]{{Ref/Reuse|s1e2}}
|Unknown
|-
|[[Henry Glassman]]{{Ref/Reuse|s1e2}}
|Survived
|-
|[[Lani Truman]]{{Ref/Reuse|tsfh}}
|Unknown
|-
|[[Leslie Boyd]]{{Ref/SpOps|Id=miller|Memento Mori|Spartan Miller}}
|Unknown
|-
|[[Morgan Rivera]]{{Ref/SpOps|Id=fs|Artifact (Spartan Ops)|EpisodeLinkText=Artifact|For Science}}
|Unknown
|-
|[[Ruiz]]{{Ref/Reuse|miller}}
|Unknown
|-
|[[Shannon Owen]]
|Unknown{{Ref/SpOps|Catherine|Galileo}}
|}

{{Col-2}}
===Jul 'Mdama's Covenant===
====Naval assets====
=====Starships=====
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Tactical grouping
! Class
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
| rowspan="2" |Unknown
|[[CAS-class assault carrier|''Kerel''-pattern assault carrier]]
|''[[Song of Retribution]]''{{Ref/Reuse|Exodus}}
|Survived
|-
|{{Pattern|Zanar|light cruiser}}
|''[[Panom's Canticle]]''{{Ref/Site|Id=rundown|URL=https://www.halowaypoint.com/news/canon-fodder-rubicon-rundown|Site=Halo Waypoint|Page=Canon Fodder: Rubicon Rundown|D=3|M=8|Y=2022}}
|Destroyed
|}
====Military Personnel====
{| class="wikitable sortable " style="width: 75%;" cellspacing="1" cellpadding="1" border="0"
|-
! Rank
! Name
! Status<!--This refers to their status after the battle, not their overall status-->
|-
|[[Supreme Commander]]
|[[Jul 'Mdama]]{{Ref/Reuse|s1e4}}
|Survived
|-
| rowspan="2" |[[Commander (Covenant)|Commander]]
|[[Gek 'Lhar]]{{Ref/Reuse|SO8}}
|KIA
|-
|[[Parg Vol]]{{Ref/SpOps|Id=ht|Catherine|Hunting Trip}}
|KIA
|-
|[[Shipmaster]]
|[[Ryn 'Alun]]{{Ref/Reuse|umbrage}}
|Unknown
|}

====Units====
=====Ground forces=====
*[[Covenant Special Operations]]
**[[Silent Blade]]

{{Col-end}}

==Gallery==
<gallery>
File:H4SO Requiem SpaceBattle Concept.jpg|Concept art for the space battle over Requiem.
File:InfinityRam.jpg|''Infinity'' rams a Covenant {{Pattern|Maugen|armored cruiser}} immediately upon arrival at Requiem in ''[[Spartan Ops]]''.
File:S1Departure - RequiemAccess.jpg|[[D79H Pelican]]s and [[F-41 Broadsword]]s attempt to punch a hole through to Requiem.
File:Infinity n Frigates.png|''Infinity'' and two of her {{Class|Strident|heavy frigate}}s over Requiem.
File:H4-SpOps-Invasion RequiemEntrance.png|The wreckage of a ''Strident''-class heavy frigate outside Requiem's entry portal.
File:Vindication - Spartan Ops.png|A trio of {{Class|Vindication|light battleship}}s deploy their ground forces onto Requiem.
File:H4SO_InfinityUnderAttack.jpg|The ''Infinity'' under attack.
File:H4 SOS1 Sniper Team.jpg|Members of [[Fireteam Majestic]] in combat on Requiem.
File:Majestic - 2.png|Fireteam Majestic recovering "the [[Didact's Gift]]".
File:H4 SO Halsey with Jul 'Mdama.jpg|Jul 'Mdama and Dr. Halsey converse.
File:H4-Fortress.png|A Marine and a SPARTAN-IV fighting 'Mdama's Covenant forces at "[[Fortress (location)|Fortress]]".
File:H4-SpartanOps-4.jpg|A SPARTAN-IV faces down a Promethean Knight in close combat.
</gallery>

==List of appearances==
*''[[Halo 4]]''
**''[[Spartan Ops]]'' {{1st}}
*''[[Halo: Escalation]]''
*''[[Halo 5: Guardians]]'' {{Mo}}
**''[[Halo 5: Guardians Limited Edition dossiers|Limited Edition dossiers]]'' {{Mo}}
*''[[Halo Mythos: A Guide to the Story of Halo]]''
*''[[Halo Infinite]]
**''[[Season 05: Reckoning]]'' {{Mo}}
*''[[Halo: The Rubicon Protocol]]'' {{Mo}}
*''[[Halo: Vertical Umbrage]]''
*''[[Halo: Trial of Reckoning]]'' {{Mo}}
*''[[Halo: Fifth Canticle]]'' {{Mo}}

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

{{Post-Covenant War conflicts}}
[[Category:Requiem Campaign| ]]