Editing Onyx

{{Era|Forerunner|UNSC|HCW|Post}}

|diameter= {{Convert|14829|km}}<ref name="ONI S3 DD1"/>

|gravity=0.998 G<ref name="ONI S3 DD1"/>

|daylength= 28.728 hours<ref name="ONI S3 DD1"/>

|yearlength= 415.394 days<ref name="ONI S3 DD1"/>

|atmosphere= 1.031 ([[Wikipedia:Nitrogen|N₂]], [[Oxygen|O₂]], [[Argon|Ar]])<ref name="ONI S3 DD1"/>

|temperature= -25°C to 47°C (-13°F to 116.6°F)<ref name="ONI S3 DD1"/>

|government=Formerly [[ecumene]] and later, [[Unified Earth Government]]

'''Onyx''', officially known to the [[UNSC]] as "'''XF-063'''" or '''Zeta Doradus IV''',<ref name="mythos 136">'''[[Halo Mythos]]''', ''page 136'' ("...Onyx's boundless interior surface...")</ref> was a planet-sized [[Forerunner]] megastructure located in the [[Zeta Doradus system]], and formerly the external component of the [[shield world|shield installation]] designated [[Trevelyan|Shield World 006]]. While it had a [[human]]-habitable surface and a seemingly terrestrial crust Onyx was internally composed of trillions of [[Onyx Sentinel]]s.<ref name="disintegrate">'''Halo: Ghosts of Onyx''', ''page 377-378''</ref> The artificial planet's ultimate purpose was to guard the entrance to the shield world proper, a [[Dyson sphere]] held in a miniature [[slipspace bubble]].<ref>'''Halo: The Thursday War''', ''page 120''</ref> During the [[Human-Covenant War]], Onyx served as the headquarters of the [[SPARTAN-III program]] and was the location of the massive, three-sided [[Onyx Conflict]] in late [[2552]]. At the conclusion of the battle, Onyx itself disintegrated, only leaving the Dyson sphere in its core intact. After the disintegration of the artificial planet, the name "Onyx" has often been applied to the Dyson shell that remains in its stead,<ref name="mythos 136"/><ref name="lessons">'''[[Halo: Fractures]]''', "[[Lessons Learned]]"</ref> and can be regarded as the overall name for the shield installation, comprising both the planetary shell and the Dyson sphere.<ref>'''[[Halo Mythos]]''', ''page 113'' ("Onyx was, in fact, a Forerunner shield world...")</ref><ref name="mythos 136"/>

==Background==

Onyx, named by the [[UNSC Engineering Corps]] due to the unusually large [[Onyx (material)|onyx]] quarries found in the planet's crust, had an [[oxygen]]-[[Wikipedia:Nitrogen|nitrogen]] gas atmosphere, of suitable pressure for human life with a temperate weather cycle. It also had an unusually large number of indigenous species of flora and fauna, some of which were edible by humans and posed no threatening danger. The transplanting of [[Earth]] species was immediately possible.<ref name="goo123"/>

Some notable anomalies were that it had no detectable tectonic activity, an unusually strong planetary magnetic field, and slightly higher than normal background radiation.<ref name="goo123"/> All of this was explained when it was revealed that the planet's crust was composed of large numbers of dormant Sentinels.<ref name="disintegrate"/>

 

 

 

 

 

 

 

 

{{Main|Onyx Conflict}}

 

Kurt, [[Franklin Mendez|CPO Mendez]] and the Spartan-IIIs were soon joined by [[Catherine Halsey|Dr. Catherine Halsey]] and later, [[Blue Team]], and they eventually made their way into an excavated Forerunner city in [[Zone 67]]. Meanwhile, both the [[Joyous Exultation Covenant|Covenant]] and the UNSC sent battle groups to retrieve Onyx's Forerunner technologies. The [[Patterson's battle group|UNSC battle group]] was destroyed in the ensuing battle.<ref>'''Halo: Ghosts of Onyx''', ''page 376''</ref> The humans, led by Kurt, fell back into the interior of Onyx and discovered its map room, where they were redirected by Endless Summer to destroy Onyx's Sentinel factory. Eventually, the survivors made a last stand against the Covenant in the core room antechamber, before retreating into the safety of the shield world. After the gateway into the shield world had closed, Kurt detonated two [[FENRIS nuclear warhead|nuclear warheads]], ensuring the Covenant did not follow his comrades. Immediately afterward, the Sentinels that had made up Onyx's foundational structure obliterated the terrestrial surface and decimated the Covenant fleet.<ref name="disintegrate"/>

 

 

==Locations on Onyx==

*[[Shield World]] [[Trevelyan]]

==Notes==

*In ''[[Halo: The Fall of Reach]]'', its mentioned that the {{UNSCShip|Pillar of Autumn}} took part in an ongoing conflict with the [[Covenant]] in the [[Zeta Doradus system]] which is where Onyx was located. The conflict was not further expanded upon nor was it ever mentioned again, but it didn't involve Onyx which remained completely free of Covenant influence until after the portal the [[shield world]] became active.

*According to [[Fred-104]], Onyx is located weeks away from [[Earth]] in even humanity's fastest [[Slipspace]]-capable ships. In contrast, Covenant ships can cross that distance in a matter of hours.

*Physically, Onyx is the first [[Forerunner]] [[shield world]] located by the UNSC though only the outer planetary shell was known about until [[2552]]. In [[2531]], the [[Etran Harborage]] outer planet and its inner Dyson sphere were discovered by the {{UNSCShip|Spirit of Fire}}. However, as the ''Spirit of Fire'' became trapped in deep space, the UNSC were left unaware of this discovery.

**[[Terminal/Halo 3|Terminals]] {{Mo}}

**''[[Halo 5: Guardians Limited Edition|Limited Edition]]'' {{Mo}}

<references/>

[[Category:Onyx]]

[[Category:Forerunner installations]]