“XF-063 is a rare jewel of a find.”
Trevelyan, also known as Shield 0006 or XF-063 and formerly known as Onyx, 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. 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.
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 extraterrestrial intelligence.
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 later 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.
The planet was named Onyx by the Unified Earth Government due to the unusually large Onyx quarries found in the planet's crust. Its oxygen-nitrogen gas atmosphere, pressure, and temperate weather cycle was found suitable for human life. 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.
The UNSC Engineering Corps' Geological Expedition Four was among the first teams to survey the planet.
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.
With the course of the Human-Covenant War, Vice Admiral Margaret 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
“Team Katana, Team Gladius? Forget the test, guys, we've got a situation.”
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-051 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.
Months later, in January 2553, a series of concentric rings of debris radiated from where Onyx had once been. The slipspace bubble housing the shield world, however, had survived intact and the Dyson sphere was eventually transitioned into normal space. ONI soon converted the shield world into a research facility, named "Trevelyan" in reference to Kurt-051's original surname.
Onyx's surface was composed of seemingly infinite numbers 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 a few 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.
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