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{{Status|Canon}}
{{Era|Forerunner|Post}}
{{Forerunner infobox
{{Forerunner Infobox
|image=[[File:H4-JanusKey-ScanRender.png|100px|The assembled Janus Key.]]
|image=[[File:H4-JanusKey-ScanRender.png|100px|The assembled Janus Key.]]
|role= Galactic cartographer{{Ref/Reuse|evg}}
|role= Galactic cartographer<ref name="evg"/>
|length=;Complete key
|length=;Complete key
*{{Convert|14.2|cm|in|sp=us}}{{Ref/Reuse|evg}}
*{{Convert|14.2|cm|in|sp=us}}<ref name="evg"/>
;Single key
;Single key
*{{Convert|14|cm|in|sp=us}}{{Ref/Reuse|evg}}
*{{Convert|14|cm|in|sp=us}}<ref name="evg"/>
|height=;Complete key
|height=;Complete key
*{{Convert|4.9|cm|in|sp=us}}{{Ref/Reuse|evg}}
*{{Convert|4.9|cm|in|sp=us}}<ref name="evg"/>
;Single key
;Single key
*{{Convert|3.5|cm|in|sp=us}}{{Ref/Reuse|evg}}
*{{Convert|3.5|cm|in|sp=us}}<ref name="evg"/>
|mass={{Convert|3|cm|in|sp=us}}{{Ref/Reuse|evg}}
|mass={{Convert|3|cm|in|sp=us}}<ref name="evg"/>
|mass-title=Width
|mass-title=Width
|armament=
|armament=
|armor=
|armor=
}}
}}
{{Quote|We did not create so much without a means to catalog it all.|The [[Librarian]]'s imprint to [[Catherine Halsey]]<ref name="Key">'''Spartan Ops:''' ''[[S1/Key|S1E9 Key]]''</ref>}}


The '''Janus Key''' is a [[Forerunner]] [[Cartographer|cartographical]] artifact<ref name="evg">'''[[Halo 4: The Essential Visual Guide]]''', ''page 135''</ref> that provides real-time location of every piece of Forerunner technology in the [[Milky Way|galaxy]] when its halves are combined.{{Ref/Reuse|Key}}
{{quote|We did not create so much without a means to catalog it all.|The [[Librarian]]'s imprint to [[Catherine Halsey]]<ref name="Key">'''Spartan Ops:''' ''[[S1/Key|S1E9 Key]]''</ref>}}
The '''Janus Key''' is a [[Forerunner]] [[Cartographer|cartographical]] artifact<ref name="evg">'''[[Halo 4: The Essential Visual Guide]]''', ''page 135''</ref> that provides real-time location of every piece of Forerunner technology in the [[Milky Way|galaxy]] when its halves are combined.<ref name="Key" />
 
== Background ==
Created in order to catalog the Forerunners' vast technological advancements, the key was placed within the [[Librarian's Rest]] inside the [[shield world]] [[Requiem]]; there, it would remain under the care of the [[Librarian]]'s locally stored memory. The device was to be presented to the [[Ur-Didact]] after he returned from [[Cryptum|stasis]] so he could give it to [[human]]ity to spur their technological advancement. However, the Didact turned on humanity when he was awakened in [[2557|July 2557]], renewing his quasi-genocidal campaign which had been halted [[100,000 BCE|one hundred millennia prior]].


==History==
==History==
===Origins===
[[2558|Six months after]] the Didact's [[New Phoenix Incident|attack on Earth]] was foiled, the Librarian's stored personality gave the key to [[Catherine Halsey|Dr. Catherine Halsey]], instructing her to take the key to the [[Absolute Record]]. After Halsey reawakened in the [[Jul 'Mdama's Covenant|Covenant]]-controlled [[Copernicus Base]], [[Jul 'Mdama]] took half of the artifact and escaped with the doctor. As she was being carried away, she threw the other half of the key to [[SPARTAN-IV program|Spartan]] [[Gabriel Thorne]].<ref name="Key"/> Thorne eventually gave his half to [[Henry Glassman|Dr. Henry Glassman]] for further study.<ref>'''Spartan Ops:''' ''[[S1/Exodus|S1E10 Exodus]]''</ref>
Created in order to catalog the Forerunners' vast technological advancements, the key was designed in two pieces for security purposes. It was always protected by two Forerunner [[rate]]s at all times, one with the [[Builders]] and one with the [[Warrior-Servants]]. This formal balance of power guarded the interests of both rates, requiring complete unity of purpose before the Key could be used. How the Librarian came to possess both pieces remains a mystery.<ref>'''[[Halo Mythos]]''', ''page 184''</ref> At some point, the key was placed within the [[Librarian's Rest]] inside the [[shield world]] [[Requiem]]; there, it would remain under the care of the [[Librarian]]'s locally stored memory. The device was to be presented to the [[Ur-Didact]] after he returned from [[Cryptum|stasis]] so he could give it to [[human]]ity to spur their technological advancement. However, the Didact turned on humanity when he was awakened in [[2557|July 2557]], renewing his quasi-genocidal campaign which had been halted [[97,445 BCE|one hundred millennia prior]].
 
===Discovery on Requiem===
[[File:HTMCC-H4 SO JanusKeyDisplay.png|thumb|250px|left|The Librarian reveals the Janus Key to Halsey.]]
[[2558|Six months after]] the Didact's [[New Phoenix Incident|attack on Earth]] was foiled, the Librarian's stored personality gave the key to [[Catherine Halsey|Dr. Catherine Halsey]], instructing her to take the key to the [[Absolute Record]]. After Halsey reawakened in the [[Jul 'Mdama's Covenant|Covenant]]-controlled [[Copernicus Base]], [[Jul 'Mdama]] took half of the artifact and escaped with the doctor. As she was being carried away, she threw the other half of the key to [[SPARTAN-IV program|Spartan]] [[Gabriel Thorne]].{{Ref/Reuse|Key}} Thorne eventually gave his half to [[Henry Glassman|Dr. Henry Glassman]] for further study.<ref>'''Spartan Ops:''' ''[[S1/Exodus|S1E10 Exodus]]''</ref>
 
===The Absolute Record===
In July 2558, five months after the [[Requiem Campaign]], Glassman continued his inspection of the incomplete Janus Key onboard the {{UNSCShip|Infinity}}. [[File:HE14 Sali 'Nyon.jpg|thumb|250px|Sali 'Nyon obtains a half of the Janus Key.]] At the same time, Dr. Halsey, who allied herself with Jul 'Mdama, plotted to acquire the UNSC's half of the Janus Key. She and 'Mdama constructed a decoy Forerunner artifact for ''Infinity'' to find on the surface of the planet [[Aktis IV]]. Upon its discovery, a deceived Dr. Glassman requested ''Infinity'' to transport the UNSC's half of the key down to the planet, to examine how the two artifacts would interact. Captain Lasky dispatched a Pelican and a Broadsword to deliver the key to the site. As the aircraft approached their destination, they were both shot down by Covenant anti-air artillery. The attack, however, was not issued on Jul 'Mdama's order and was instead carried out by [[Sali 'Nyon's Covenant|defectors of 'Mdama's own faction]]. ''Infinity''<nowiki>'</nowiki>s half of the Janus Key immediately fell into the hands of Jul 'Mdama's leading detractor, a self-proclaimed Sangheili prophet named [[Sali 'Nyon]].<ref>'''Halo: Escalation''', ''[[Halo: Escalation Issue 14|Issue #14]]''</ref>
[[File:HE16 Next destination The Absolute Record.jpg|left|thumb|250px|The Janus Key showing the [[Absolute Record]]'s location.]]
However, [[Unidentified Sangheili Minor (Aktis IV)|a Sangheili Minor]] disillusioned with 'Nyon's rebellion stole his half of the Janus Key and contacted 'Mdama's forces, offering them the key along with the location of 'Nyon's hideout.<ref name="HE15">'''Halo: Escalation''', ''[[Halo: Escalation Issue 15|Issue #15]]''</ref> A contingent of 'Mdama's troops met with the Minor, with Dr. Halsey personally verifying the artifact's authenticity. However, after 'Mdama redirected most of his forces elsewhere, three Spartan-IVs led by Commander [[Sarah Palmer]] ambushed the group. Halsey attempted to escape with the Janus Key half but she was taken captive by Palmer. However, the doctor was able to distract the Spartan commander, escaped with the artifact, and was picked up by one of 'Mdama's Phantoms. Now in possession of both halves of the Janus Key, 'Mdama and Halsey recombined the artifact, generating a holographic map to pinpoint the location of the Absolute Record.<ref name="HE16">'''Halo: Escalation''', ''[[Halo: Escalation Issue 16|Issue #16]]''</ref>


On [[2558#September|September 15, 2558]], hiding within the [[Urs system]], Halsey pinpointed the exact location of the Absolute Record. Two days later, as the fleet prepared to depart for the Absolute Record, a Phantom carrying Spartans Palmer, Thorne, [[Holly Tanaka]], Dr. Glassman, and [[Ayit 'Sevi]],boarded ''[[Breath of Annihilation]]'', intending to reveal the location of the Absolute Record to the UNSC. The fleet arrived at an artificial gas giant with a dormant [[slipspace]] portal opening due to the close proximity of the Janus Key. Before the fleet could press forward, slipspace ruptures materialized around the fleet, destroying at least two ships and damaging ''Breath of Annihilation''.<ref name="HE19">'''Halo Escalation''', ''[[Halo: Escalation Issue 19|Issue 19]]''</ref> While Halsey and 'Mdama argued about the situation, she reminded him that once they reached the Absolute Record, they will discover technology beyond their comprehension that will do more than compensate for the ships that were destroyed. Halsey further exaggerated that once he was in control of the Absolute Record's "treasures", 'Mdama would be seen as a god. Thus 'Mdama decided to travel to the Absolute Record, with only ''[[Song of Retribution]]'' entering the portal while the rest made repairs. As ''Retribution'' entered the portal, 'Mdama learned of rumors of the Spartans attacking personnel of ''Annihilation''. Halsey dismissed 'Mdama's fears and stated that the Spartans could not stop them from reaching the Absolute Record, unaware that Palmer, Tanaka, and Glassman had boarded ''Retribution''. The carrier traveled through the portal and arrived at the Record where all the humans aboard were detected by a [[Contender-class artificial intelligence|Contender-class]] [[Invariant Bias|Custodian]].<ref name="HE20">'''Halo Escalation''', ''[[Halo: Escalation Issue 20|Issue 20]]''</ref>
In July 2558, five months after the [[Requiem Campaign]], Glassman continued his inspection of the incomplete Janus Key onboard the {{UNSCship|Infinity}}. At the same time, Dr. Halsey, who allied herself with Jul 'Mdama, plotted to acquire the UNSC's half of the Janus Key. She and 'Mdama constructed a decoy Forerunner artifact for ''Infinity'' to find on the surface of the planet [[Aktis IV]]. Upon its discovery, a deceived Dr. Glassman requested ''Infinity'' to transport the UNSC's half of the key down to the planet, to examine how the two artifacts would interact. Captain Lasky dispatched a Pelican and a Broadsword to deliver the key to the site. As the aircraft approached their destination, they were both shot down by Covenant anti-air artillery. The attack, however, was not issued on Jul 'Mdama's order and was instead carried out by [[Sali 'Nyon's Covenant|defectors of 'Mdama's own faction]]. ''Infinity''<nowiki>'</nowiki>s half of the Janus Key immediately fell into the hands of Jul 'Mdama's leading detractor, a self-proclaimed Sangheili prophet named [[Sali 'Nyon]].<ref>'''Halo: Escalation''', ''[[Halo: Escalation Issue 14|Issue #14]]''</ref>


[[File:WTF.png|thumb|175px|Halsey loses possession of the Janus Key.]]
However, [[Unidentified Sangheili Minor|a Sangheili Minor]] disillusioned with 'Nyon's rebellion stole his half of the Janus Key and contacted 'Mdama's forces, offering them the key along with the location of 'Nyon's hideout.<ref name="HE15">'''Halo: Escalation''', ''[[Halo: Escalation Issue 15|Issue #15]]''</ref> A contingent of 'Mdama's troops met with the Minor, with Dr. Halsey personally verifying the artifact's authenticity. However, after 'Mdama redirected most of his forces elsewhere, three Spartan-IVs led by Commander [[Sarah Palmer]] ambushed the group. Halsey attempted to escape with the Janus Key half but she was taken captive by Palmer. However, the doctor was able to distract the Spartan commander, escaped with the artifact, and was picked up by one of 'Mdama's Phantoms. Now in possession of both halves of the Janus Key, 'Mdama and Halsey recombined the artifact, generating a holographic map to pinpoint the location of the Absolute Record.<ref name="HE16">'''Halo: Escalation''', ''[[Halo: Escalation Issue 16|Issue #16]]''</ref>
After ''Retribution'' was forced through a portal to a large chamber, Halsey, 'Mdama, and a contingent of [[Sangheili Zealot|Zealots]] traveled to a lower platform, where Halsey addressed the [[ancilla]] and told it that she was selected by the Librarian and her possession of the Janus Key was proof of it. However, the AI was skeptical of her claims, stating that Halsey could have obtained the Key by force and especially pondering why the other humans aboard ''Retribution'' felt the need to conceal themselves. The AI had its Sentinels bring the other humans down to the platform, and stated its intent to let each human have a chance to account for its presence at the installation. Frustrated after a heated conflict between the two parties, the AI removed the flooring from under the feet of the Sangheili, with Tanaka, Palmer, and Glassman remaining on one platform and Halsey with 'Mdama standing on another. In order to decide who would be the legitimate steward of the Absolute Record, the AI decided on a direct examination.<ref name="HE21">'''Halo Escalation''', ''[[Halo: Escalation Issue 21|Issue 21]]''</ref> It had both factions isolated and gave them a hypothetical scenario, in which a sapient species turned out to have bodies conducive to a [[Flood]] vaccine. Abducting and harvesting live beings would give a thirty-five percent chance of Flood-immune material, but receiving dead bodies from the beings would give them a thirty-three percent chance. Despite 'Mdama's advice, Halsey chose live capture while Glassman chose the peaceful option, and the ancilla commended both. It then asked if their opponents in this test should be kept confined or immediately killed, but instead of answering, Halsey hacked the ancilla and shut it down, taking control of the Record for herself.<ref name="HE22">'''Halo Escalation''', ''[[Halo: Escalation Issue 22|Issue 22]]''</ref>


In the Record, Halsey followed a hologram of the Librarian directing her to dormant design seeds scattered across the galaxy, which she could choose to activate the next step of their plans for human evolution. As she listened, 'Mdama started to grow impatient with Halsey and told his warriors to restrain her once she left to remind her of who was in charge. Halsey overheard 'Mdama's through the Record's systems and decided to sever their partnership and send the installation's Sentinels to attack 'Mdama and his men.<ref name="HE23">'''Halo Escalation''', ''[[Halo: Escalation Issue 23|Issue 23]]''</ref> As Halsey made preparations, Palmer, Tanaka, and Glassman came in contact with a Sentinel containing the backup memory of the Record's ancilla. With their aid, the AI regained control of the facility and barred Halsey from controlling it further. The custodian then took the Janus Key and pulled the Absolute Record back into slipspace.<ref name="HE24">'''Halo Escalation''', ''[[Halo: Escalation Issue 24|Issue 24]]''</ref>
On [[2558#September|September 15, 2558]], hiding within the [[Urs system]], Halsey pinpointed the exact location of the Absolute Record. Two days later, as the fleet prepared to depart for the Absolute Record, a Phantom carrying Spartans Palmer, Thorne, [[Holly Tanaka]], Dr. Glassman, and [[Ayit 'Sevi]],boarded ''[[Breath of Annihilation]]'', intending to reveal the location of the Absolute Record to the UNSC. The fleet arrived at an artificial gas giant with a dormant [[slipspace]] portal opening due upon the close proximity of the Janus Key. Before the fleet could press forward, slipspace ruptures materialized around the fleet, destroying at least two ships and damaging ''Breath of Annihilation''.<ref name="HE19"> '''Halo Escalation''', ''[[Halo: Escalation Issue 19|Issue 19]]''</ref> While Halsey and 'Mdama argued about the situation, she reminded him that once they reached the Absolute Record, they will discover technology beyond their comprehension that will do more than compensate for the ships that were destroyed. Halsey further exaggerated that once he was in control of the Absolute Record's "treasures", 'Mdama would be seen as a god. Thus 'Mdama decided to travel to the Absolute Record, with only ''[[Song of Retribution]]'' entering the portal while the rest made repairs. As ''Retribution'' entered the portal, 'Mdama learned of rumors of the Spartans attacking personnel of ''Annihilation''. Halsey dismissed 'Mdama's fears and stated that the Spartans could not stop them from reaching the Absolute Record, unaware that Palmer, Tanaka, and Glassman had boarded ''Retribution''. The carrier traveled through the portal and arrived at the Record where all the humans aboard were detected by a [[Contender-class artificial intelligence|Contender-class]] [[custodian]].<ref name="HE20"> '''Halo Escalation''', ''[[Halo: Escalation Issue 20|Issue 20]]''</ref>


== Trivia ==
== Trivia ==
*The key is named after the Roman god [[Wikipedia:Janus|Janus]], who had dominion over beginnings and endings. The key's being split in half is also a reference to Janus, as he is usually depicted with two faces.
*The key is named after the Roman god [[Wikipedia:Janus|Janus]], who had dominion over beginnings and endings. The key's being split in half is also a reference to Janus, as he is usually depicted with two faces.
*The Janus Key is similar in purpose to the mythical [[Abaddon|Organon]], which some Forerunners believed would activate all [[Precursor]] technology in the galaxy.
*The Janus Key is similar in purpose to the [[Domain|quasi-extant]] [[Organon]], which some Forerunners believed would activate all [[Precursor]] technology in the galaxy.
*During the filming of motion capture for Episode 9's cutscene ''The Key'', two highlighter pens were used as props for the two halves of the Key.<ref>[https://twitter.com/jentaylortown/status/301525338100465665 '''Twitter''': ''Spartan Ops Ep 9 is out...'']</ref>
*During the filming of motion capture for Episode 9's cutscene ''The Key'', two highlighter pens were used as props for the two halves of the Key.<ref>[https://twitter.com/jentaylortown/status/301525338100465665 '''Twitter''': ''Spartan Ops Ep 9 is out...'']</ref>
*Each half of the Janus Key is shaped after the center part of the [[Forerunner symbols#Eld|Forerunner glyph]] for the [[Mantle]].<ref>[https://pbs.twimg.com/media/Bm1irqvCQAA9g1W.png:large Image of one half of the Janus Key superimposed over the Eld symbol]</ref>
*Each half of the Janus Key is shaped after the center part of the [[Forerunner symbols#Eld|Forerunner glyph]] for the [[Mantle]].<ref>[https://pbs.twimg.com/media/Bm1irqvCQAA9g1W.png:large Image of one half of the Janus Key superimposed over the Eld symbol]</ref>
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==Gallery==
==Gallery==
<gallery>
<gallery>
File:H4SO JanusKeyContainer Concept.jpg|Concept art of the Janus key's container.
File:H4-SO-S1E9-Librarian-Cinematic06.jpg|The Librarian presenting the disassembled Janus Key to Dr. Halsey.
File:HTMCC-H4 SO LibrarianJanusKey2.png|The Librarian presenting the disassembled Janus Key to Dr. Halsey.
File:H4-SOps-Halsey-Librarian.jpg|A holographic map of star systems produced by combining the Janus Key.
File:H4-SO-S1E9-Thorne-with-half-key.jpg|Spartan Gabriel Thorne with one half of the Janus Key.
File:H4-SO-S1E9-Thorne-with-half-key.jpg|Spartan Gabriel Thorne with one half of the Janus Key.
File:H4-SO-S1E9-Mdama-with-key.jpg|Jul 'Mdama with the other half of the Janus Key.
File:H4-SO-S1E9-Mdama-with-key.jpg|Jul 'Mdama with the other half of the Janus Key.
File:H4SO - Janus Key molecular estructure.jpg|Glassman analyzing the molecular structure of the Janus Key.
File:HE13 Halsey Key Half.jpg|Halsey with half of the Janus Key.
File:HE13 Halsey Key Half.jpg|Halsey with half of the Janus Key.
File:HE13 Glassman Palmer.jpg|Glassman and Palmer with the other half of the key.
File:HE13 Glassman Palmer.jpg|Glassman and Palmer with the other half of the key.
File:HE14 Sali 'Nyon.jpg|Sali 'Nyon obtains a half of the Janus Key
File:HE14 Sali 'Nyon.jpg|Sali 'Nyon obtains a half of the Janus Key
File:HE15 Second Thought.jpg|A Sangheili Minor with a half of the Janus Key, after stealing it from Sali 'Nyon.
File:HE15 Second Thought.jpg|A Sangheili Minor with a half of the Janus Key, after stole it from Sali 'Nyon.
File:HE16 Next destination The Absolute Record.jpg|The Janus Key showing the [[Absolute Record]]'s location.
</gallery>
</gallery>


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*''[[Halo: Escalation]]''
*''[[Halo: Escalation]]''
*''[[Halo 5: Guardians]]'' {{Mo}}
*''[[Halo 5: Guardians]]'' {{Mo}}
*''[[Halo Mythos]]''
*''[[Halo: Epitaph]]'' {{Mo}}
*''[[Halo: The Machine Breaks]]'' {{Mo}}


==Sources==
==Sources==
{{Ref/Sources}}
<references/>


{{Forerunner|artifacts}}
{{Forerunner|artifacts}}


[[Category:Forerunner artifacts]]
[[Category:Forerunner artifacts]]

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