My title explains it all, I will be guiding you through what I think this means.
XF-063= ONYX
ZETA DORADUS, IV= HUMAN OCCUPIED WITH BOTH UNSC AND ONI FORCES
DIAMETER= 9.21431341 MILES
THERE IS ONE SATELLITE WATCHING OVER THE PLANET
GRAVITY= BELOW NORMAL
ATMOSPHERE= NITROGEN (n2), OXYGEN (o2), ARGON (AR)
SURFACE TEMPERATURE IN FAHRENHEIT= -13 DEGREES FARHENHEIT-116 DEGREES FAHRENHEIT
LOCAL DAY: MONDAY
LOCAL YEAR: 2554
AS YOU CAN SEE WE ARE LOOKING LIKE WE ARE HEADING TO ONYX, HERE IS ALL THE INFO KNOW ABOUT ONYX
Onyx, officially known by the UNSC as "XF-063", was a planet-sized Forerunner construct located in the Zeta Doradus System. While it had a Human habitable surface and a seemingly terrestrial crust, internally, it was actually composed of trillions of Onyx Sentinels.[2] Onyx's ultimate purpose was to guard the entrance to a Shield World. It was the location of the massive, three-sided Battle of Onyx.
Background
Onyx, named by the Unified Earth Government due to the unusually large onyx quarries found in the planet's crust, had an Oxygen-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.
Some notable anomalies were that it had no detectable tectonic activity, an unusually strong planetary magnetic field, and slightly higher than normal background radiation. All of this was possibly explained when it was revealed that the planet's crust was composed of large numbers of dormant Sentinels.
Structure 
Onyx's surface, as mentioned before, was composed of seemingly infinite amounts of Sentinels, with a massive Forerunner city hidden under the terraformed ground layer. Under the surface, there was a vast network of underground tunnels and installations, including a map room and an immense Sentinel production facility under the northern polar region.
In the core of Onyx, there was a large room, the Core Room Antechamber. It contained a slipspace rift that would be open for a short time after the Halo Array was put into standby mode, allowing evacuation to the Micro Dyson Sphere within, acting as an escape from the Array's destructive firing.
The Dyson Sphere habitat located wholly within a maintained slipspace bubble, which in normal space, is only some meters in diameter, has a diameter of approximately 300 million kilometers. The megastructure has a habitable, terraformed surface and in the center, a G2-type star to provide terrestrial lighting.[3]
History
A UNSC complex on the surface of Onyx. Onyx was discovered by the UNSC Engineering Corps sometime around May, 2491. In ENGCORP Field Report A76344, Captain D. F. Lambert stated "XF-063 is a rare jewel of a find" and recommended colonization. The Assembly quickly moved to keep colonization from occurring, as they had discovered the presence of Forerunner artifacts independently of the UNSC and feared that humanity would not be ready to learn about the existence of alien life.
On February 19, 2492, in ENGCORP Field Report A79052 Lieutenant W. K. Davidson stated that Geological Expedition Four found an entire phylum of possible alien taxonomy and recommended a follow-up survey with specialists in Paleobiology, Xenobiology, and Biochemistry.
In 2511, when archaeological expeditions uncovered massive subterranean Forerunner constructions in what would after be called Zone 67, ONI immediately took control of the world, going so far as to remove Onyx from UNSC navigational databases and suspending any prospective colonization and terraforming attempts. However, further attempts to determine the purpose of the structures, or even to extract any usable technology, yielded no results. In 2525, with the coming of the Human-Covenant War, the operation was scaled down and only a minimum ONI garrison and a single AI remained. The planet's location remained secret. Regular scans continued to yield little of value.
With the course of the Human-Covenant War, Vice Admiral Margaret O. Parangosky authorized the construction of the SPARTAN-III training base on Onyx in 2531 (there were three companies trained, Alpha, Beta, and Gamma) because of the planet's obscurity. This base, designated Camp Currahee, was constructed perilously close to Zone 67, which had been declared strictly off limits. However, during a routine exercise north of Currahee, Beta Company Team X-ray trespassed into Zone 67, entered a Forerunner structure, and disappeared without trace. An ONI investigation into the matter was inconclusive, although X-Ray was rumored to have encountered a "glowing eye", which detonated upon discovery.
Battle of Onyx
In 2552, Onyx's Sentinels were roused to action by the standby signal from Installation 05, instigating the Battle of Onyx and revealing Onyx's true nature. The AI Endless Summer took command of all military personnel on Onyx to immediately defend Zone 67 per General Order 98.93.120, after Onyx's Sentinels first started to attack the SPARTAN-III's. Endless Summer sent Kurt a flash transmission sending attached files directly into Kurt's retina. An explosion stopped Endless Summer's transmission before Kurt could finish scanning the new threat. At the conclusion of the battle, Onyx was effectively destroyed, although not before Bloody Arrow was declared and Blue Team, Team Saber, Team Katana, Dr. Halsey, and SCPO Mendez escaped to the safety of the Shield World.
Locations on Onyx
Camp Currahee
-
- Command Center
- Armory
- NCO quarters
- NCO's Inspection yard
- Infirmary
- Camp Commandant's residence.
[*]The Tree House[*]Zone 67
[*]Twin Forks River[*]Gregor Canyon[*]El Morro Point[*]Shield World
- Core Room Antechamber
- Sentinel Production Facility
- Entrence to Core room
Trivia
[*]he Terminals mention that there were indeed Forerunners on Onyx. However, the Terminals were probably referring to the Onyx Sentinels being on Onyx or the construction of it to become a Shield World to be protected from any of the the Halos.[*]The Sentinels on Onyx were much stronger than the ones on Installation 04 and Installation 05, being able to combine forms, and were capable of space flight.[*]Onyx on the Moh's hardness scale is seven.
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