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{{Status|Canon}}
{{Cleanup}}
{{disambig header|the battle during the [[Human-Covenant War]]|the battle in 2558|Second Onyx conflict}}
{{triple battle infobox
{{Battle infobox
|prev=[[First Battle of Earth]]
|prev=[[Battle of Mombasa]]
|conc=[[Second Battle of Earth]]
|conc=[[Battle for Earth]], [[Battle of Installation 05]]
|next=Unknown
|next=[[Battle of Mare Erythraeum]]
|name=Battle of Onyx
|name=Onyx Conflict
|image=
|image=[[File:Ghosts of Onyx Cover.jpg|313px]]
|conflict=[[Human-Covenant War]]
|conflict=[[Human-Covenant War]]
*[[Great Schism]]
|date=November 3, 2552
|date=[[2552#October|October 31]]-[[2552#November|November 3]], [[2552]]
|place=[[Onyx]], [[Zeta Doradus System]]
|place=[[Onyx]], [[Zeta Doradus system]]
|result=Covenant Space Victory, UNSC Ground Victory
|result='''Forerunner constructs victory'''
|side1=[[United Nations Space Command]]
*Some UNSC forces escape
|side2=[[Covenant]]
*Onyx disintegrates into trillions of Sentinels
|side3=[[Forerunner]] [[Sentinel]]s
*All Covenant forces destroyed
|commanders1=[[Admiral Carl "Buster" Patterson]]†|commanders2=Fleet Master [[Voro 'Mantakree | Voro Nar 'Mantakree]]†
*[[Sarcophagus]] [[shield world]] sealed with some survivors inside
|commanders3=
|side1=*{{Icon|UNSC HCW}} [[United Nations Space Command|UNSC]]
|forces1=[[Battle Group Stalingrad|Battle Group ''Stalingrad'']]
|side2=*[[Covenant separatists]]
*1 [[Carriers | carrier]]
**[[Joyous Exultation Covenant]]
*2 [[Destroyer | destroyers]]
|side3=*{{Icon|Forerunner}} [[Sentinel|Forerunner constructs]]
*1 prowler
|commanders1=*[[ADM]] [[Carl Patterson]]
*5 other ships
*[[LCDR]] [[Kurt Ambrose]]†
*five [[Spartan-II]]s
|commanders2=[[Fleet Master]] [[Voro Nar 'Mantakree]]
*five [[Spartan-III]]s
|commanders3= Unknown
*several [[Marines]]
|forces1=Space
|forces2=*fifty-four assorted [[Covenant]] ships
*[[Battle Group Omicron]]<ref>'''[[Halo Mythos]]''', ''page 113''</ref>
*legions of [[Grunts]] and [[Elites]]
**1 [[UNSC carrier|carrier]]
*six [[Hunters]]
**1 {{Class|Marathon|heavy cruiser}}
*[[Banshees]]
**6 [[UNSC destroyer|destroyers]]
|forces3=*thousands of [[Sentinels]]
**1 [[UNSC prowler|prowler]]
|casual1=*''[[UNSC Stalingrad | Stalingrad]]''
*{{UNSCShip|Agincourt (frigate)}}
*''[[UNSC Glasgow Kiss | Glasgow Kiss]]''
Ground
*''[[UNSC Iwo Jima | Iwo Jima]]''
*5 [[SPARTAN-II program|Spartan-IIs]]
*five other ships
*17 [[SPARTAN-III program|Spartan-IIIs]]
*[[Admiral Carl "Buster" Patterson | Admiral Patterson]]
*Several ONI agents
*[[Will-043]]
|forces2=54 [[Covenant]] [[Covenant starship|warships]]
*[[SPARTAN-051 | Kurt-051]]
*[[Second Fleet of Homogeneous Clarity]]
*[[Spartan-G188 "Dante" | Dante-G188]]
**22 ships  
*[[Spartan-G003 | Holly-G003]]
***1 [[Varric-pattern heavy cruiser|heavy cruiser]]
|casual2=*twenty assorted [[Covenant]] ships
***1 [[Covenant carrier|carrier]]
*all ground forces
***2 [[Covenant cruiser|cruisers]]
*[[Voro 'Mantakree | Voro Nar 'Mantakree]]
***18 [[Covenant destroyer|destroyers]]
|casual3=*thousands of [[Sentinels]]
*[[Combined Fleet of Righteous Purpose]]
*[[Sentinel Production Facility]]
**32 ships
***Multiple [[Covenant carrier|carrier]]s
***Multiple [[Covenant cruiser|cruiser]]s
***Multiple [[Covenant destroyer|destroyer]]s
*Legions of Covenant warriors
**Six [[Mgalekgolo]]
**Over two hundred [[Sangheili]]
**Thousands of [[Unggoy]]
*[[Type-26 Ground Support Aircraft|Banshees]]
*[[Type-31 Seraph|Seraphs]]
|forces3=*Trillions of [[Onyx Sentinel|Sentinel]]s
*[[Sentinel manufacturing facility]]
|casual1=*Battle Group Omicron save for {{UNSCShip|Dusk}}
*{{UNSCShip|Agincourt (frigate)}}
*[[William-043|Will-043]]
*[[Kurt Ambrose]]
*[[Dante-G188]]
*[[Holly-G003]]
*[[Team Gladius]]
*An unknown number of [[Office of Naval Intelligence|ONI]] personnel
|casual2=*All Covenant ships
*All ground forces
*[[Voro Nar 'Mantakree]]
|casual3=*Thousands of [[Sentinel]]s
*Sentinel manufacturing facility
}}
}}
==Introduction==
The '''Battle of Onyx''' was a heavy, prolonged military engagement between the [[Forerunner]] [[Sentinel]]s, [[United Nations Space Command]], and the [[Covenant]].
==Prelude==
[[Onyx]] was a planet discovered by the United Nations Space Command Geophysics Corps, a "rare jewel of a find". It had an atmosphere suitable for human life, ecosystemic properties that could support terraforming, but had a slightly elevated background radiation level, but could still support human life.


The '''Onyx Conflict'''<ref>[https://www.halowaypoint.com/en-us/universe/characters/kelly-087 '''Halo Waypoint''': ''Kelly-087'']</ref> was a military engagement between the [[Forerunner]] [[Onyx Sentinel|Sentinels]] of the planet [[Onyx]], the [[United Nations Space Command]], and a [[Joyous Exultation Covenant|fledgling Covenant splinter group]]. The UNSC [[operation]] to reinforce the stranded UNSC forces on Onyx was codenamed '''Operation: CIRRUS'''.{{Ref/Game|Id=H5GLtd|Halo 5: Guardians Limited Edition|[[Halo 5: Guardians Limited Edition dossiers#Frederic-104|Dossier files]] - Frederic-104}}
Archeological expeditions discovered massive subterranean constructs on Onyx: Forerunner buildings. However, even the concerted efforts of the [[Office of Naval Intelligence]] were unable to discern the meaning of such buildings, and the area was waded off, the major expeditions were called off, and only a minimal ONI garrison continued regular scans of the structures.


==Battle==
The secrecy necessary for the exploration of Forerunner buildings forced ONI to wipe Onyx from UNSC navigational databases, essentially making it invisible from all peoples not associated with the project. This secrecy, however, made Onyx appropriate for the training ground of the [[SPARTAN-III]] supersoldiers. Yet, the proximity of the SPARTAN-III training base, [[Camp Currahee]], to the Forerunner buildings, was bound for disaster. [[Beta Company]] [[Team X-ray]], on a routine exercise north of Curahee, intruded into a Forerunner structure and vanished, presumably killed or captured by Sentinels. ONI was sent to investigate, but the results of their findings were unknown. However, what was known was that the land that Team X-ray had forayed into was designated strictly off-limits, even to the Spartan-IIIs, termed [[Zone 67]], and was heavily guarded.
===The Sentinel activation===
When [[Installation 04|Alpha Halo]] was almost activated,{{Ref/Novel|GoO|Page=175|Quote=Halsey: That timing coincides with the activation of an alien weapon world - before John thankfully destroyed it. It is no coincidence that the Sentinels appeared then. It must be part of a larger Forerunner plan.}} it emitted a signal that placed all other [[Forerunner]] installations in standby mode, including the Sentinels guarding the [[Sarcophagus|shield world]] located within the artificial world of [[Onyx]]. The Sentinels themselves first appeared on the morning of [[2552#September|September 21, 2552]].{{Ref/Novel|GoO|Page=175}} On [[2552#October|October 31, 2552]], the first of these Sentinels to awaken suddenly began attacking [[United Nations Space Command|UNSC]] forces on and near [[Onyx]]. Coincidentally, [[SPARTAN-III Gamma Company|Gamma Company]] was participating in the top honors exercise at the time.<ref>'''Halo: Ghosts of Onyx''', ''pages 117-120''</ref>


Almost immediately, [[Team Gladius]] and the orbiting {{UNSCShip|Agincourt (frigate)}} were destroyed and [[Team Katana]] lost after passing to Zone 67. The [[SPARTAN-III program|SPARTAN-III]] trainers, save for [[Franklin Mendez|SCPO Mendez]] and [[Kurt Ambrose]] were all killed as well. In accordance with emergency protocols, Zone 67's AI [[Endless Summer]] assumed complete command of all UNSC forces on Onyx.<ref>'''Halo: Ghosts of Onyx''', ''pages 122''</ref> Shortly afterward, [[Team Saber]] regrouped with Kurt-051, [[Tom-B292]], [[Lucy-B091]] and [[Franklin Mendez|SCPO Mendez]], although they had no means of summoning reinforcements from the rest of the UNSC. [[Franklin Mendez|Mendez]] declared [[Bloody Arrow]] via UNSC E-Band.<ref>'''Halo: Ghosts of Onyx''', ''page 159''</ref>
The destruction of [[Alpha Halo]] by [[SPARTAN-117]] led to another attack by the mechanized alien wardens. A pitched space and ground battle thus began...


On November 3, [[Catherine Halsey|Dr. Halsey]], [[Kelly-087]] and [[Artificial intelligence|AI]] [[Jerrod]] arrived at Onyx aboard ''[[Beatrice]]''. Attacking Sentinels forced the ship to crash land on the planet, although all three passengers survived to link up with Kurt-051's group. Halsey proceeded to convince the resident [[Office of Naval Intelligence|ONI]] AI, Endless Summer, to send a distress message to Earth using the [[Slipspace COM launcher]]. In the signal Halsey requested the deployment of [[SPARTAN-II Program|SPARTAN-IIs]] to Onyx.<ref name="goo182">'''Halo: Ghosts of Onyx''', ''page 182-184''</ref> The launcher was destroyed shortly after firing.<ref>'''Halo: Ghosts of Onyx''', ''page 313''</ref>
==Space==


Using Cortana's distress signal from Installation 05 as a "carrier wave",{{Ref/Reuse|goo182}} the message succeeded in reaching a [[Battle of Earth|besieged Earth]] in mere hours and diverting [[Blue Team]] to [[Onyx]].<ref>'''Halo: Ghosts of Onyx''', ''page 211-213''</ref> However, en route the message had been intercepted by the [[Joyous Exultation Covenant|Covenant]]. The newly promoted [[Sangheili]] [[Fleet Master]] [[Voro Nar 'Mantakree]] of the [[Second Fleet of Homogeneous Clarity]] was deployed to Onyx under orders to destroy all UNSC forces and recover any Forerunner artifacts, as the Sangheili had not yet made a formal alliance with the UNSC.<ref>'''Halo: Ghosts of Onyx''', ''page 243''</ref>
The UNSC ''[[UNSC Agincourt|Agincourt]]'' is destroyed in orbit by [[Sentinels]].


===Blue Team and the Covenant arrive===
The ''[[Beatrice]]'' arrives, is engaged by Sentinels, and crash lands on [[Onyx]]. [[Kelly-087]], [[Catherine Elizabeth Halsey | Halsey]], and the AI [[Jerrod]] manage to survive. Later, the ''[[Bloodied Spirit]]'' arrives, is engaged by Sentinels, forcing [[Fred-104]], [[Will-043]], and [[Linda-058]] to bail in a [[Spirit]].
Blue Team, composed of [[William-043]], [[Linda-058]], and [[Frederic-104]], arrived at Onyx aboard the commandeered ''[[Bloodied Spirit]]'', but were forced to make their way down to the surface in a [[Dextro Xur-pattern Spirit|Spirit]] when their ship was attacked by Sentinels. Linking up with [[Kurt-051]]'s group they planned to attack [[Zone 67]]. Using the Spirit, they flew into a crater and discovered a Forerunner city.<ref>'''Halo: Ghosts of Onyx''', ''pages 267-274''</ref>


At the same time, 'Mantakree's forces formed around the flagship ''[[Incorruptible]]'' and began nearing Onyx. The destroyer ''[[Far Sight Lost]]'' was sent ahead to scout the environs but was quickly engaged and destroyed by Sentinels. Another scout, ''[[Absolution]]'', was ordered to perform a precision [[Slipstream space|Slipspace]] jump to the northern polar areas of Onyx, but the Sentinels followed it through Slipspace and the ''Absolution'' was destroyed upon exiting Slipspace.<ref>'''Halo: Ghosts of Onyx''', ''pages 280-283''</ref> However, sufficient information had been gathered and 'Mantakree ordered his ground troops, including [[Sangheili]] from the [[E'Toro Warrior Crèche|E’Toro]], [[R'Lan Warrior Crèche|R’Lan]] and [[N'Noro Warrior Crèche|N’Nono]] warrior crèches, to converge on Zone 67.<ref>'''Halo: Ghosts of Onyx''', ''pages 350''</ref>
[[Voro 'Mantakree | Voro Nar 'Mantakree]], a newly appointed [[Covenant]] [[Zealot]] [[Elite]], arrives at the scene in order to purge Onyx of [[UNSC]] forces and harvest the [[Forerunner]] technology believed to be there. His task force makes contact with the Sentinels, who initiate fire on the ''[[Far Sight Lost]]''. He orders the ''[[Absolution]]'' to perform a precision [[slipspace]] jump to the northern polar areas of Onyx for scouting purposes, and the Sentinels use this to jump through slipspace and then destroy the ''Absolution'' as it exited slipspace. Voro orders the fleet to [[Zone 67]] and discovers the Forerunner city and homes in on the human’s location.


===Patterson's battlegroup arrives===
The UNSC ''[[Dusk]]'', a Prowler, arrives at Onyx via slipspace in the wake of the ''Bloodied Spirit'' after Voro engages the Sentinels. Shortly thereafter, [[Admiral Carl "Buster" Patterson | Admiral Patterson]] arrives with [[Battlegroup Stalingrad]] intending to catch the Covenant off guard. The battle group finishes off several [[Covenant CPV-class Heavy Destroyer | Covenant destroyers]] using [[Archer_missile | Archer missiles]] and nukes. A single destroyer survives, and fires at the UNSC ''[[UNSC Stalingrad | Stalingrad]]'', the flagship of the battle group where Admiral Patterson was commanding from. The battle group launches MAC rounds to finish the ship and the UNSC ''[[UNSC Glasgow Kiss | Glasgow Kiss]]'' puts itself between the ''Stalingrad'' and the plasma fire and some of the crew bails out.
Shortly after 'Mantakree had engaged the Sentinels, the {{UNSCShip|Dusk}} arrived by Slipspace from [[Earth]], having utilized the ''Bloodied Spirit''<nowiki>'</nowiki>s [[Slipstream space#Slipspace wake|slipspace wake]]. The prowler provided advanced intelligence for a [[Patterson's battle group|battlegroup]] under the command of [[Admiral]] [[Carl Patterson]] that arrived shortly thereafter. Intending to catch the enemy off guard, the UNSC force homed in on a group of Covenant destroyers and destroyed all but one destroyer. The {{UNSCShip|Glasgow Kiss}} was sacrificed to preserve the {{UNSCShip|Stalingrad}} from plasma fire from the lone destroyer. The ''Glasgow Kiss'' intercepted three of the four lances of fire and launched 12 escape pods before it was destroyed.<ref>'''Halo: Ghosts of Onyx''', ''page 294''</ref>


Despite taking multiple hits, the Covenant destroyer fled to the other side of Onyx, leading the UNSC force into a trap of twenty additional Covenant warships. Several more Covenant destroyers were eliminated, but the launch of a massive plasma volley forced the UNSC ships to accelerate into the attack and close the distance to forestall a second volley. Only five UNSC ships survived the charge, of which one, the {{UNSCShip|Iwo Jima}}, was destroyed when she detonated a [[nuclear weapon]] and her [[Fusion drive|engine]], destroying a further two Covenant warships and damaging six more in the ensuing explosion.<ref name="g298">'''Halo: Ghosts of Onyx''', ''page 298''</ref>
The Covenant destroyer takes multiple hits and flees to the other side of Onyx, leading the UNSC battle group into a trap of twenty Covenant warships. The UNSC ships manage to take out several destroyers, but the Covenant launches a massive volley of plasma. The UNSC ships accelerate into the attack in hopes of emerging too close for a second volley. Five ships survive the volley, of which one, the UNSC ''[[UNSC Iwo Jima | Iwo Jima]]'', crashes into several enemy ships, taking two down and damaging six others in the resulting explosion. The other four manage to flee to the other side of Onyx. The Sentinels choose this time to attack the Covenant fleet, destroying an additional three destroyers and buying the UNSC ships time to retreat and regroup. The Covenant ships attempt to retreat from the gravity of Onyx, using two ships as decoys while the rest pull back.


Defeated once more, the remaining Covenant ships withdrew again to the opposite side of the planet but were there attacked by Sentinels who used plasma capture to destroy yet another three destroyers. Realizing their peril, the Covenant ships began to withdraw from Onyx's gravity well. Two ships were used as a rearguard and one was destroyed. 16 ships escaped in all.<ref>'''Halo: Ghosts of Onyx''', ''page 299-300''</ref>
The UNSC prepare to engage the Covenant ships again. The ''Dusk'' lays a [[HORNET Mines | HORTNET] nuclear minefield on either side of Onyx’s moon. The UNSC ships then fire from behind the moon at the Covenant ships; three Covenant ships are hit, but remain undamaged. As the Covenant ships enter the mine fields, the UNSC detonate the HORTNET mines and destroy twelve of the sixteen Covenant ships. Admiral Patterson maneuvers his four ships in and finish off two of the wounded Covenant ships immediately. The other two Covenant ships travel around the moon, and as they come back to face the remaining UNSC ships, a Covenant armada of thirty-two ships jumps from slipspace and utterly destroy Admiral Patterson’s remaining ships.


The intervention of the Sentinels allowed the UNSC ships time to regroup around Onyx's [[XF-063 IV-1|moon]]. There ''Dusk'' laid a minefield of 14 [[HORNET Mine|HORNETs]], each rating at thirty-megatons with vacuum-enhanced loads. The UNSC warships then opened fire from behind the moon, hitting some of the enemy but causing negligible damage, but drawing the Covenant's attention. As the Covenant closed to engage and entered the field the HORNETs were detonated, destroying all but four of the remaining Covenant warships. Two of these were immediately set upon by the UNSC and destroyed. The remaining two whipped around the moon and as battle was about to be joined again, a [[Covenant fleet]] of 32 ships arrived from slipspace. Patterson's battle group was completely destroyed, except for ''Dusk'', in the one-sided engagement that followed. The UNSC battle group amazingly destroyed a total of 20 Covenant ships throughout the battle before being totally annihilated by the arrival of the new Covenant fleet.<ref>'''Halo: Ghosts of Onyx''', ''page 332-333''</ref>
==Ground==


===Retreat to the shield world===
The battle began when the Sentinels of Onyx engaged the [[Spartan-III]]s and other personnel on Onyx during the Top Honors exercise of Gamma Class. [[Team Gladius]] went MIA, considered KIA, almost immediately. [[Team Katana]] was captured. [[Team Saber]] linked with [[SPARTAN-051 | Kurt-051]], [[Spartan-B292 "Tom" | Tom-B292]], [[Spartan-B091 "Lucy" | Lucy-B091]], and [[Chief Petty Officer Franklin Mendez | Chief Mendez]] to form a resistance. Kelly-087 and Dr Halsey crash land on Onyx later, and link up with Team Saber and Kurt-051. The Sentinels they fight are different from those seen on the [[Halos]]. They are much stronger, and several physical differences. Team Saber and company try to fight them, but the struggle is tough.  
While the UNSC and Covenant fleets traded space-borne crossfire whilst in orbit, in the Forerunner city [[Kurt-051]]'s group of survivors was engaged by Covenant troops led personally by Voro Nar 'Mantakree. The SPARTAN-IIs and IIIs held off the enemy advance while Halsey, aided by [[Kelly-087]] and [[Franklin Mendez|Mendez]], configured Onyx's [[teleportation grid]], their means of escape. [[Dante-G188]] was killed rescuing [[Frederic-104]] from plasma and [[Type-33 Guided Munitions Launcher|Needler]] fire. Once the teleportation grid was functioning, the humans moved to the [[Sentinel manufacturing facility]] near the north pole in the aim of destroying it. At the advice of AI [[Endless Summer]], this would save Admiral Patterson's battle group. Halsey identified three key structures in the facility and they were destroyed by tricking Sentinels into firing on them.<ref>'''Halo: Ghosts of Onyx''', ''pages 313-324''</ref> Moving on, Kurt-051's group came upon [[Team Katana]] trapped in [[slipspace field pod]]s. Unable to free the prisoners, the [[human]]s were forced to bring the sarcophagi with them as they traveled to the [[core room antechamber]] where they prepared a stand against pursuing Covenant troops.<ref>'''Halo: Ghosts of Onyx''', ''pages 346-348''</ref>


While two [[legion]]s of [[Unggoy]] attacked [[Lieutenant Commander]] Kurt-051 and his forces atop the stepped structure, the remainder of the attackers set up [[stationary shield generator]]s and placed three groups of thirty Sangheili and one [[Mgalekgolo]] pair behind each shield. From this jump-off point, the Sangheili formed a wall using [[Kig-Yar point defense gauntlet]]s and began to advance through grenade and sniper fire. When the Covenant reached the first step, redeployed [[Lotus Anti-Tank Mine|Lotus mines]] killed several Sangheili and dazed Mgalekgolo. One Mgalekgolo was dispatched by Kurt-051 before they could recover. Kelly-087 engaged and killed three [[type-1 Energy Weapon/Sword|energy sword]]-wielding Sangheili and was then flanked by two more Mgalekgolo but was saved by [[Holly-G003]], who was killed in the effort.<ref name="goo360">'''Halo: Ghosts of Onyx''', ''page 360-362''</ref>
Fred-104, Will-043, and Linda-058, having recently captured the ''Bloodied Spirit'', arrive at Onyx in response to a distress call from Halsey requesting Spartans. They immediately come under attack from Sentinels and have to bail out in a Spirit. They link up with Kurt-051 and his team and plan an attack on Zone 67. They fly into the crater in a Spirit, and then find a Forerunner city.


The Spartans piled onto the two Mgalekgolo. Kurt-051 was wounded. Will-043 killed one Mgalekgolo, that had been shot by Linda-058, in hand-to-hand combat but was in turn shot and killed by the second. The last Mgalekgolo was killed by Fred-104 with a [[M41 Surface-to-Surface Rocket Medium Anti-Vehicle/Assault Weapon|Jackhammer]] missile mainly for efficiency reasons, as it could take down a Mgalekgolo with one hit.{{Ref/Reuse|goo360}}
A firefight between Covenant forces and Kurt-051’s forces in the Forerunner city ensues. Kurt-051, Fred-104, Linda-058, and several Spartan-IIIs try to hold the Covenant back while Halsey tries to configure a teleportation grid for them. Kelly-087 and Mendez are with Halsey. [[Spartan-G188 "Dante" | Dante-G188]] is killed while rescuing Fred-104 by plasma and Needler fire. AI [[Endless Summer]] contacts Halsey and Kurt-051, telling them they need to destroy the [[Sentinel Production Facility]] in order to save Battlegroup Stalingrad. Halsey gets the teleportation grid working, and they all teleport to the Sentinel Production Facility near the northern pole in Onyx. Halsey sends them to destroy three key structures, which would bring the entire production to a halt. Using the teleportation grid, they go to the three structures and trick Sentinels into firing on them on a line with the structures. Having destroyed the structures, they teleport back.


[[File:HM OnyxDestruction.jpg|250px|thumb|Onyx disintegrating into trillions of sentinels.]]
Kurt-051 and his team arrive at Team Katana’s holding area and find them in some sort of cryo-slipspace containment cells. There are eight such containers, five of which contain Spartan-IIIs. They travel to the [[Core Room Antechamber]], where they prepare to hold off a Covenant invasion force from a small tower. The Covenant have three [[Hunter]] pairs, Elites from the E’Toro, R’Lan, and N’Nono warrior crèches, and plenty of other troops. First, they sent two hundred [[Grunts]] to distract Kurt-051 and company while Elites set up stationary shield generators. There were three groups of thirty Elites and one Hunter pair behind each shield. The Elites form a line and advance behind Jackal shields. Kurt-051’s group uses [[Grenade | grenades]] and [[Sniper | snipers]] to counter. When the Elites and Hunters approach the stairs, Kelly-087 detonates [[Lotus Anti Tank-Mine | LOTUS mines]] placed on the first step, killing several Elites and dazing two Hunters. Kurt-051 kills one Hunter, but the other manages to duck behind its shield. Kelly-087 engages three [[sword]]-wielding Elites, killing all three, but is flanked by two Hunters. [[Spartan-G003 | Holly-G003]] sacrifices herself to save Kelly. Kurt rushes forward and a Hunter slashes him with its shield. Linda-058 puts a round into the Hunters midsection, and then Will-043 engages them both in hand-to-hand combat. He kills one, but the other shoots him. Fred-104 kills the second with a well placed [[M19 SSM (SPNKr) Rocket Launcher | Jackhammer]] missile.  
However, the main Covenant assault with hundreds of Sangheili, [[Type-26 Ground Support Aircraft|Banshees]] and Unggoy, was yet to come. Realizing it was futile for his diminished force to resist further, Kurt-051 ordered the survivors into the shield world while opting to remain behind to prevent the Covenant from reopening the portal. 'Mantakree ordered his troops to not fire upon the center of the chamber, while sending in Huragok with [[slipspace field shunt]]s to reopen the portal. With 'Mantakree approaching to finish off the wounded Spartan personally, Kurt-051 detonated two [[FENRIS nuclear warhead|FENRIS warheads]], killing himself and the entire enemy force in the antechamber as well as triggering the Sentinels of Onyx to "erupt" through the surface of the planet. With the portal closed, his comrades who had escaped into shield world were trapped, but unharmed.<ref>'''Halo: Ghosts of Onyx''', ''page 372''</ref>


===Destruction of Onyx===
The Covenant forces pull back. Hundreds of Elites, [[Banshees]], and Grunts prepare for the main assault. Kurt-051 orders all other personnel through the core and into a Micro [[Dyson Sphere]]. Kurt-051 stays behind, and after the rift closes, the Covenant approach. Voro approaches, intending to kill Kurt-051 and then reopen the rift, when Kurt-051 detonates the two [[FENRIS Nuclear Warhead | FENRIS nukes]], killing himself, Voro, and the entire Covenant force in the Core Room Antechamber.
With the shield world closed and gated, Onyx disintegrated into its trillions of component Forerunner Sentinels. The Covenant fleet, so recently victorious against the humans, were finally obliterated by the swarm of vigilant constructs. Only the {{UNSCShip|Dusk}} managed to escape alive and intact.<ref>'''Halo: Glasslands''', ''page 48''</ref>


==Aftermath==
==Characters==
Kelly, Fred, Ash, and the other remaining Spartans (including Dr. Halsey and Mendez) were transported from the portal to a Dyson sphere.
'''Space'''
*Human
**[[Admiral Carl "Buster" Patterson]]
**[[Commander Richard Lash]]
**[[Lieutenant Joe Yang]]
**[[Lieutenant Commander Julian Waters]]
**[[Lieutenant Commander Xaing Cho]]
**[[Lieutenant Bethany Durruno]]
*Covenant
**[[Voro 'Mantakree | Voro Nar 'Mantakree]]
**[[Uruo 'Losonaee]]
**[[Zasses 'Jeqkogoee]]
**[[Y'gar 'Pewtrunoee]]
**[[Qunu]]
'''Ground'''
*Human
**[[SPARTAN-051 | Lieutenant Commander Ambrose / Kurt SPARTAN-051]]
**[[SPARTAN-104 | Lieutenant Junior Grade Fred SPARTAN-104]]
**[[SPARTAN-043 | Petty Officer Second Class Will SPARTAN-043]]
**[[SPARTAN-058 | Petty Officer Second Class Linda SPARTAN-058]]
**[[SPARTAN-087 | Petty Officer Second Class Kelly SPARTAN-087]]
**[[Spartan-B091 "Lucy" | Petty Officer Second Class Lucy SPARTAN-B091]]
**[[Spartan-B292 | Petty Officer Second Class Tom SPARTAN-B292]]
**[[Spartan-G003 | Petty Officer Second Class Holly SPARTAN-G003]]
**[[Spartan-G099 | Petty Officer Second Class Ash SPARTAN-G099]]
**[[Spartan-G188 "Dante" | Petty Officer Second Class Dante SPARTAN-G188]]
**[[Spartan-Olivia | Petty Officer Second Class Olivia SPARTAN-G???]]
**[[Spartan-Mark | Petty Officer Second Class Mark SPARTAN-G???]]
**[[Chief Petty Officer Franklin Mendez]]
**[[Catherine Elizabeth Halsey | Dr. Catherine Elizabeth Halsey]]
**[[Endless Summer | Endless Summer AI#4279]]
**[[Jerrod | Jerrod "Micro AI"]]
*Covenant
**[[Voro 'Mantakree | Voro Nar 'Mantakree]]
**[[Paruto Xida Konna]]
**[[Waruna Xida Yotno]]


===Legacy===
==Ships==
{{Main|Onyx United Research Project|Second Onyx conflict}}
'''UNSC'''
*[[Battlegroup Stalingrad]]
**UNSC [[UNSC Carrier|Carrier]] ''[[UNSC Stalingrad|Stalingrad]]''
**UNSC [[UNSC Destroyer|Destroyer]] ''[[UNSC Braderia|Braderia]]''
**UNSC [[UNSC Destroyer|Destroyer]] ''[[UNSC Glasgow Kiss|Glasgow Kiss]]''
**UNSC [[UNSC Destroyer|Destroyer]] ''[[UNSC Iwo Jima|Iwo Jima]]''
**UNSC [[UNSC Prowler|Prowler]] ''[[UNSC Dusk|Dusk]]''
*UNSC ''[[UNSC Agincourt|Agincourt]]''
*UNSC ''[[Chiropetra-class Stealth Vessel|Chiropetra]]''[[Chiropetra-class Stealth Vessel|-class Prowler]] [[Beatrice]]
*Covenant [[Covenant CPV-class Heavy Destroyer|Destroyer]] ''[[Bloodied Spirit]]''
'''Covenant'''
*Covenant ''[[Reverence-class Cruiser|Reverence]]''[[Reverence-class Cruiser|-class Cruiser]] ''[[Incorruptible]]''
*Covenant [[Covenant CPV-class Heavy Destroyer|Destroyer]] ''[[Absolution]]''
*Covenant [[Covenant CPV-class Heavy Destroyer|Destroyer]] ''[[Far Sight Lost]]''


{{Expand-section}}
[[Category:Human-Covenant War]]
 
==Participants==
{{col-begin}}
{{col-2}}
===UNSC===
===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="5" |[[Battle Group Omicron]]
|{{Class|Sahara|heavy prowler}}
|{{UNSCShip|Dusk}}
|Survived
|-
|[[UNSC carrier]]
|{{UNSCShip|Stalingrad}}
|Destroyed
|-
| rowspan="3" |[[UNSC destroyer]]
|{{UNSCShip|Brasidas}}
|Destroyed
|-
|{{UNSCShip|Glasgow Kiss}}
|Destroyed
|-
|{{UNSCShip|Iwo Jima}}
|Destroyed
|-
| rowspan="3" |Unknown
|[[UNSC frigate]]
|{{UNSCShip|Agincourt (frigate)}}
|Destroyed
|-
|{{Pattern|Sinaris|heavy destroyer}}
|''[[Bloodied Spirit]]''
|Destroyed
|-
|Other
|''[[Beatrice]]''
|Crash landed
|}
 
====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="19" |[[UNSC Navy]]
|[[Admiral]]
|[[Carl Patterson]]
|KIA
|-
|[[Commander]]
|[[Richard Lash]]
|Survived
|-
| rowspan="3" |[[Lieutenant Commander]]
|[[Julian Waters]]
|Survived
|-
|[[Xaing Cho]]
|Survived
|-
|[[Kurt-051]]
|KIA, likely listed MIA
|-
| rowspan="2" |[[Lieutenant]]
|[[Bethany Durruno]]
|Survived
|-
|[[Joe Yang]]
|Survived
|-
| rowspan="5" |[[Petty Officer Second Class]]
|[[William-043]]
|KIA, likely listed MIA
|-
|[[Linda-058]]
|Survived
|-
|[[Kelly-087]]
|Survived
|-
|[[Lucy-B091]]
|Survived
|-
|[[Tom-B292]]
|Survived
|-
| rowspan="2" |[[Senior Chief Petty Officer]]
|[[Frederic-104]]
|Survived
|-
|[[Franklin Mendez]]
|Survived
|-
| rowspan="5" |Unknown
|[[Holly-G003]]
|KIA, likely listed MIA
|-
|[[Ash-G099]]
|Survived
|-
|[[Dante-G188]]
|KIA, likely listed MIA
|-
|[[Olivia-G291]]
|Survived
|-
|[[Mark-G313]]
|Survived
|}
===Units===
====Ground forces====
*[[UNSC Navy]]
**[[Blue Team]]
**[[Team Saber]]
**[[Team Gladius]]
**[[Team Katana]]
====Naval forces====
*[[Battle Group Omicron]]
===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-->
|-
|[[Endless Summer]]
|Unknown
|-
|[[Jerrod]]
|Survived
|}
 
===Civilians===
====People====
{| 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-->
|-
|[[Catherine Halsey|Dr. Catherine Elizabeth Halsey]]
|Survived
|}
{{col-2}}
 
===Joyous Exultation 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-->
|-
|[[Second Fleet of Homogeneous Clarity]]
|{{Pattern|Varric|heavy cruiser}}
|''[[Incorruptible]]''
|Destroyed
|-
| rowspan="2" |[[Combined Fleet of Righteous Purpose]]
| rowspan="2" |[[Covenant Destroyer]]
|''[[Absolution]]''
|Destroyed
|-
|''[[Far Sight Lost]]''
|Destroyed
|}
 
====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="7" |Unknown
|[[Fleetmaster]]
|[[Voro Nar 'Mantakree]]
|KIA
|-
|[[Shipmaster]]
|[[Qunu]]
|KIA
|-
| rowspan="5" |Unknown
|[[Uruo 'Losonaee]]
|Unknown
|-
|[[Zasses 'Jeqkogoee]]
|Unknown
|-
|[[Y'gar 'Pewtrunoee]]
|Unknown
|-
|[[Paruto Xida Konna]]
|KIA
|-
|[[Waruna Xida Yotno]]
|KIA
|}
 
===Units===
====Ground forces====
*[[E'Toro Warrior Crèche]]
*[[R'Lan Warrior Crèche]]
*[[N'Nono Warrior Crèche]]
====Naval forces====
*[[Second Fleet of Homogeneous Clarity]]
*[[Combined Fleet of Righteous Purpose]]
 
{{col-end}}
 
==List of appearances==
*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo 5: Guardians]]''
**''[[Halo 5: Guardians Limited Edition dossiers|Limited Edition dossiers]]'' {{Mo}}
*''[[Halo Mythos]]''
*''[[Halo Fractures]]''
**''[[Lessons Learned]]'' {{Mo}}
*''[[Halo: Legacy of Onyx]]'' {{Mo}}
 
==Sources==
{{Ref/Sources|2}}
 
{{Human-Covenant War}}
[[Category:Battles of the Human-Covenant War|Onyx]]
[[Category:Onyx|Conflict]]

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