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{{Status|Canon}}
{{Era|Forerunner|HCW}}
{{Forerunner infobox
{{Forerunner Infobox
|name= Onyx Sentinel
|name= Onyx Sentinel
|image=  
|image=  
|role= Defense of [[Onyx]]
|role= Defense of [[Onyx]]
|first seen= [[Onyx]], [[2552]]
|first seen= [[Onyx]], [[2552]]
|length=
|length= Three meters long
*Central sphere: approx. {{Convert|25|cm|ft|sp=us}}<ref name="g231">'''Halo: Ghosts of Onyx''', ''pages 231, 298''</ref>
*Booms: approx. {{Convert|300|cm|ft|sp=us}}{{Ref/Reuse|g231}}
|length-title=Dimensions
|width=
|width=
|height=
|height=
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|misc3=Fast speeds, capable of conversing in root languages
|misc3=Fast speeds, capable of conversing in root languages
}}
}}
The '''Onyx Sentinel''' is a deadly and versatile variant of [[Forerunner]] [[Sentinel]] capable of adapting to different threats and fulfilling a variety of roles both offensive and passive.<ref name="G175">'''Halo: Ghosts of Onyx''', ''page 175''</ref> This variety has been encountered only on the [[Astroengineering|artificial world]] [[Onyx]], which was actually comprised of trillions of the machines.<ref name="G378">'''Halo: Ghosts of Onyx''', ''page 378''</ref>
The '''Onyx Sentinel''' is a [[Forerunner]]-created machine designed to protect and maintain the Forerunner [[Astroengineering|artificial world]] known as [[Onyx]].<ref>'''Halo: Ghosts of Onyx''', ''page 175''</ref> The Sentinels were a more deadly and versatile variant of the standard [[Sentinel]] design found on other Forerunner installations. This variety has been seen only on the artificial planet Onyx, which was actually comprised of trillions of the machines.<ref name="G378">'''Halo: Ghosts of Onyx''', ''page 378''</ref> Whether the same model is used on other similar worlds is currently unknown.


==Description==
==Description==
The Onyx Sentinel shares a vaguely similar appearance to a [[monitor]]—a round metallic sphere a quarter meter in diameter,{{Ref/Reuse|g231}} with a central red "eye" that glows golden. The interior of the sphere, only visible if the casing is breached, glows blue-white with heat.<ref>'''Halo: Ghosts of Onyx''', ''page 168''</ref> Hovering around this sphere are three meter-long cylindrical spars or "booms",{{Ref/Reuse|g231}} which are suspended in midair at equidistant points around the sphere.<ref name="G118">'''Halo: Ghosts of Onyx''', ''pages 118-119''</ref> These booms can change position for various purposes, and will rapidly "pop" into place to form a triangular plane when the sentinel's shields are active. The central eye is the weaponry and offensive capability of the sentinel and is capable of unleashing a devastating beam of energy.<ref name="G120">'''Halo: Ghosts of Onyx''', ''page 120''</ref> The booms are covered in a matte silver metal engraved with a subtle circle pattern,{{Ref/Reuse|g231}} while the central eye is surrounded by tiny [[Forerunner symbols|Forerunner glyphs]] floating a centimeter off the surface.<ref name="G133">'''Halo: Ghosts of Onyx''', ''page 133''</ref> The central sphere is known to emit a blackbody radiation equivalent to 6,000 degrees Kelvin (5,726.85°C / 10,340.33ºF) in its normal active state,<ref>'''Halo: Ghosts of Onyx''', ''page 153''</ref> and 15,000 degrees Kelvin (14,726.85°C / 26,540.33ºF) when charging.<ref>'''Halo: Ghosts of Onyx''', ''page 156''</ref>
The Onyx Sentinel shares a vaguely similar appearance to a [[Monitor]] - a round metallic sphere a quarter meter in diameter, with a central "eye" that glows golden. Hovering around this sphere are three meter-long cylindrical spars or "booms", which are suspended in midair at equidistant points around the sphere.<ref>'''Halo: Ghosts of Onyx''', ''page 118-119''</ref> These booms could change position for various purposes, and would rapidly "pop" into place to form a triangular plane when the sentinel's shields were active. The central eye is the weaponry and offensive capability of the sentinel as it charges and unleashes what appears to be a devastating array of energy.<ref name="G120">'''Halo: Ghosts of Onyx''', ''page 120''</ref>


The Onyx Sentinel is also equipped with [[anti-gravity technology]], similar to that of the monitors. Onyx Sentinels can even reach escape velocity and fly into outer space; in ground operations, they normally work a "higher ground" battle mentality. They are able to attenuate their communications systems to various signals, such as those of [[UNSC]] [[COM]] channels, and are equipped with Forerunner [[Translation software|translation technology]]. During the [[Onyx Conflict]], one attempted to communicate with [[Ash-G099]] using the [[human]] root language of [[Latin]],{{Ref/Reuse|G133}} supposedly based on a minimal linguistic analysis of the humans' communication.<ref>'''Halo: Ghosts of Onyx''', ''page 338''</ref> The Onyx Sentinels are highly adaptive in their behavior, being able to learn from their opponents with each encounter and adjust their tactics accordingly.{{Ref/Reuse|G175}}<ref name="G251">'''Halo: Ghosts of Onyx''', ''page 251-252''</ref>
The Onyx Sentinel is also equipped with an [[anti-gravity technology|anti-gravity device]], similar to that of the Monitors. The Onyx Sentinel can even reach escape velocity and fly into outer space; in ground operations, it normally engages its targets at a height of three meters, working a "higher ground" battle mentality. It is also able to attenuate its booms to the various signals, such as that of [[UNSC]] [[COM]] channels. The sentinels are also equipped with Forerunner translation technology and can actually speak the [[human]] archaic language and root language of [[Latin]].<ref>'''Halo: Ghosts of Onyx''', ''page 133''</ref>


== Roles ==
The Onyx Sentinels also share an attribute of a [[Artificial intelligence#"Dumb" AI|"dumb" AI]] in that an they can —within its respective parameters— learn from other beings, being able to learn from their opponents with just one encounter.<ref name="G252">'''Halo: Ghosts of Onyx''', ''page 252''</ref>
=== Combat ===
The Onyx Sentinel is one of the deadliest sentinel variants encountered to date, and is a powerful combatant on both the ground and in space. Unlike the shields of ordinary sentinels, which can be disrupted by conventional gunfire, Onyx Sentinels are protected by a spherical gold-colored [[energy shield]] that is resistant to nearly all projectiles, even the rockets of the [[M41 rocket launcher]] and [[Lotus anti-tank mine]] detonations. However, whereas normal sentinel shields are constantly in a state of activation, the shields of an Onyx Sentinel only activate when the machine detects the approach of fast-moving objects, such as bullets or [[Plasma weaponry|plasma bolts]]. This behavior does provide an exploitable advantage, as the Sentinel can be duped by slow-moving projectiles such as falling rocks.<ref>'''Halo: Ghosts of Onyx''', ''pages 134, 137''</ref> In addition, an individual Sentinel cannot fire its weapon and activate its shields at the same time.{{Ref/Reuse|G251}}


Onyx Sentinels fire golden, lethal beams of energy from their central eye, which are thought to be similar in strength to the beam weapon used by monitors. These beams impact with explosive power and are powerful enough to blast apart rock formations and vaporize organic targets on contact.{{Ref/Reuse|G120}} When multiple Sentinels merge to combine their fire, they can unleash a beam capable of destroying large starships.<ref name="G279">'''Halo: Ghosts of Onyx''', ''pages 279-280''</ref> When they first appeared, a group of Onyx Sentinels destroyed a large mesa on Onyx; [[Ash-G099]] estimated the explosion to be equivalent to a megaton of TNT.{{Ref/Reuse|G118}}
==Roles==
===Combat===
The Onyx Sentinel is one of the deadliest sentinel variants encountered to date, and is a powerful combatant on both the ground and in space. Unlike the shields of ordinary sentinels, which can be disrupted by conventional gunfire, Onyx Sentinels are protected by a spherical gold-colored [[energy shielding|energy shield]] that are resistant to nearly all projectiles, even the rockets of the [[Rocket Launcher|SPNKr rocket launcher]] and [[LOTUS Mine]] detonations. However, whereas normal sentinel shields are constantly in a state of activation, the shields of an Onyx Sentinel only activate when the machine detects the approach of fast-moving objects, such as bullets or plasma bolts. This behavior does provide an exploitable advantage, as the Sentinel can be duped by slow-moving projectiles such as falling rocks.<ref>'''Halo: Ghosts of Onyx''', ''pages 134, 137''</ref> In addition, an individual Sentinel cannot fire its weapon and activate its shields at the same time.<ref>'''Halo: Ghosts of Onyx''', ''page 251''</ref>


In combat, Onyx Sentinels possess adaptive behavior that is unique among known Forerunner constructs. The Sentinels are linked to one another, with each Sentinel recording and transmitting combat footage to one another. As they process new information, they adjust their strategies and combat behavior accordingly, and broadcast the altered battle plans to all Sentinels in range. This makes them highly dangerous on the battlefield, as a strategy that managed to destroy a Sentinel once will almost certainly not work twice.{{Ref/Reuse|G251}} While they initially operated on their own, the Sentinels on Onyx soon configured into trios with a combined pair of them on patrol and one two or three kilometers above on overwatch.{{Ref/Reuse|G251}} Even the hunter-killer pairs preferred to operate at a high altitude unless forced to descend near ground level.<ref>'''Halo: Ghosts of Onyx''', ''page 249''</ref>
In combat, Onyx Sentinels possess adaptive behavior that is unique among known Forerunner constructs. The Sentinels are linked to one another, with each Sentinel recording and transmitting combat footage to one another. As they process new information, they adjust their strategies and combat behavior accordingly, and broadcast the altered battle plans to all Sentinels on the planet. This makes them highly dangerous on the battlefield, as a strategy that managed to destroy a Sentinel once will almost certainly not work twice.<ref name="G252"/>


Onyx Sentinels can merge together, re-arranging their central spheres and orbiting booms into new, combined forms. These configurations can serve a variety of purposes; a pair of Sentinels can combine so that one can project a shield while the other fires, while a large group of Sentinels can form a cluster that can fire a single, devastatingly powerful beam of energy. Each combination adds cumulative power to their weapons, thrust, and shields.<ref>'''Halo: Ghosts of Onyx''', ''page 174''</ref> In space, large groups of Onyx Sentinels form crystalline geometries with [[seven]] as a baseline: at one point they formed into a triangular lattice of 49 Sentinels consisting of seven line-shaped formations each consisting of seven drones. Such a configuration was easily capable of overpowering a [[Covenant destroyer]].<ref>'''Halo: Ghosts of Onyx''', ''pages 232-233''</ref> When engaging [[Voro Nar 'Mantakree]]'s [[Second Fleet of Homogeneous Clarity|fleet]], thousands of the Sentinels combined into elaborate octahedral geometries.{{Ref/Reuse|G279}} Although they do not possess a slipspace capability on their own, the combined Sentinel formations are capable of tapping into other vessels' [[slipspace drive]]s and using the active slipspace matrix to perform short-range jumps to gain an edge in battle.<ref>'''Halo: Ghosts of Onyx''', ''pages 282-283''</ref> The space-borne Sentinel formations were also capable of effectively capturing the energy of Covenant [[plasma torpedo]]es and rendering them harmless.<ref>'''Halo: Ghosts of Onyx''', ''pages 298-299''</ref>
Onyx Sentinels can also merge together, re-arranging their central spheres and orbiting booms into new, combined forms. These configurations can serve a variety of purposes; a pair of Sentinels can combine so that one can project a shield while the other fires, while a large group of Sentinels can form a cluster that can fire a single, devastatingly powerful beam of energy.<ref>'''Halo: Ghosts of Onyx''', ''page 174''</ref>


=== Non-combat roles ===
Onyx Sentinels fire golden, lethal beams of energy from their central eye, which are thought to be similar in strength to the beam weapon used by Monitors. These beams are powerful enough to blast apart rock formations and vaporize organic targets on contact.<ref name="G120"/> When multiple Sentinels merge to combine their fire, they can unleash a beam capable of destroying large starships.<ref>'''Halo: Ghosts of Onyx''', ''page 233''</ref>
[[File:HM OnyxDestruction.jpg|thumb|250px|Onyx's artificial crust dissolving into its constituent Sentinels.]]
Onyx Sentinels are also known to have other specific tasks beside combat, much like other types of Sentinels. Because of their modular design, they can transform into several different types of configurations. For example, they can interlace into oblong-shaped formations, which are used for excavating and earth-moving. In the center of the worm-shaped configuration travels a continuous stream of stone. This type of configuration has been observed excavating the underground Forerunner city in Onyx's [[Zone 67]] in order to allow access to the [[Sarcophagus|shield world]] within. These variants are not hostile unless provoked.<ref>'''Halo: Ghosts of Onyx''', ''page 267''</ref>


Another, more original role of the Onyx Sentinels was making up the entire planetary structure of Onyx. Under the artificial and entirely [[terraform]]ed surface were trillions of these machines, arranged into elaborate scaffolding resembling the carbon bonds of a polymer chain. This latticework made use of the Sentinels' components in a way that the central spheres served as joints, connected to one another by the cylindrical spars. In the end of the [[Onyx Conflict]], as the portal to the shield world closed, the artificial planet dissolved with the sentinels obliterating a Covenant fleet.<ref>'''Halo: Ghosts of Onyx''', ''page 377-378''</ref>
=== Other roles ===
Onyx Sentinels are also known to have other specific tasks beside combat, much like other types of Sentinels. Because of their modular shape, they can transform into several different types of configurations. For example, they can interlace into oblong-shaped formations, which are used for excavating and earth-moving. In the center of the worm-shaped configuration travels a continuous stream of stone. This type of configuration has been observed excavating the underground Forerunner city on Onyx, to allow access to the Shield World within. These variants are not hostile, unless provoked.<ref>'''Halo: Ghosts of Onyx''', ''page 267''</ref>
 
Another, more original role of the Onyx Sentinels was making up the entire planetary structure of Onyx. Under the artificial and entirely [[Terraforming|terraformed]] surface were trillions of these machines, forming the megastructure. In the end of the battle of Onyx, as the portal to the Shield World closed, the artificial planet dissolved with the sentinels decimating a Covenant fleet.<ref name="G378"/>


To maintain the Sentinel population of Onyx, the artificial planet had a massive [[Sentinel constructor factory|Sentinel production facility]] that produced a new Onyx Sentinel every six seconds.<ref>'''Halo: Ghosts of Onyx''', ''page 314''</ref>
To maintain the Sentinel population of Onyx, the artificial planet had a massive [[Sentinel constructor factory|Sentinel production facility]] that produced a new Onyx Sentinel every six seconds.<ref>'''Halo: Ghosts of Onyx''', ''page 314''</ref>
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*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo Mythos]]''
*''[[Halo: Legacy of Onyx]]''


==Sources==
==Sources==
{{Ref/Sources|2}}
<references/>


{{Forerunner|sentinel}}
{{Forerunner2}}
[[Category:Sentinels]]
[[Category:Forerunner technology]]

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