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| {{Era|Forerunner|HCW|Post}}
| | #Redirect [[Sharpened Shield]] |
| {{New Content}}
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| {{Megastructure infobox
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| |image=
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| |description=[[Dyson sphere|Dyson shell]] with a terrestrial surface
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| |location=[[Zeta Doradus system]]
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| *Formerly within a slipspace field in [[Onyx]]
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| |type=[[Shield world]]
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| |function=Preservation of lifeforms from the [[Halo Array]]'s pulse
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| |caretaker=
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| |constructed=
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| |destroyed=
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| |diameter=Approx. 2 [[Wikipedia:Astronomical unit|AU]] (300,000,000 km)
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| *Slipspace bubble: 23 cm <ref name="glass230">'''Halo: Glasslands''', ''page 230''</ref>
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| |surface width=Approx. 255 quadrillion km<sup>2</sup>
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| |surface width-title=Surface area
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| |gravity=1.37 [[Sol|solar]] masses <ref name="glass230"/>
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| |gravity-title=Mass
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| |surface temperature=
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| |atmosphere=
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| }}
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| '''The Sharpened Shield''',<ref name="enc">'''[[Halo Encyclopedia]]''', ''page 301'' (2011 edition)</ref> known to the [[United Nations Space Command]] as '''ONI Research Facility Trevelyan''',<ref name="glass397">'''Halo: Glasslands''', ''page 397''</ref> is a [[Forerunner]] [[Dyson sphere]] formerly located within the artificial planet [[Onyx]]. At approximately two astronomical units (the diameter of Earth's orbit) in diameter and weighing approximately 1.37 solar masses,<ref name="glass230"/> the sphere is the largest known megastructure created by the Forerunners, and possibly the largest artificial structure in the galaxy.
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| ==Description==
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| The Sharpened Shield is a Dyson shell, a massive artificial structure encircling a star. According to Dr. Halsey's calculations, the internal surface area of the sphere is approximately 500 million times the surface area of [[Earth]], or around 255 quadrillion km<sup>2</sup>. When residing in a slipspace bubble of compressed dimensionality, the shield world's apparent diameter to an outside observer was only about 23 centimeters. In normal space, however, the sphere is approximately twice the size of Earth's orbit.<ref name="glass230"/> The exterior surface of the sphere is entirely featureless, and has been described as being chocolate-brown in color.<ref name="glass378">'''Halo: Glasslands''', ''page 378-379''</ref>
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| The observed portion of the interior surface of the Sharpened Shield is verdant forest, with several large cities in between. As the Forerunners never arrived, the shield world is entirely maintained by [[Huragok]] and [[Sentinel]]s. The Dyson sphere's default environmental conditions are suitable for [[Earth]]-based life, but the climate settings could be adjusted for other species' requirements.<ref>'''Halo: Glasslands''', ''page 271''</ref><ref name="enc"/>
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| There are two known sections of the shield world. The Citadel<ref>'''Halo: Glasslands''', ''page 280''</ref> is an urban habitat that served as the base camp for [[Blue Team]] for the majority of their time in the shield world. Another section, known as the Sarcophagus,<ref>'''Halo: Glasslands''', ''page 190''</ref> is essentially a garage filled with numerous [[Forerunner]] transports and vehicles. The Sarcophagus also contained a control room. It was in this section that [[Lucy-B091]] discovered several [[Huragok]] maintenance personnel, and successfully communicated with [[Prone to Drift|one of them]].
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| Access to the shield world while it is contained in slipspace can be obtained through a small portal, which was located inside an [[core room antechamber|antechamber]] in the core of the artificial planet Onyx. The portal was only active for a limited amount of time after the [[Halo Array]] had been put into standby mode.<ref>'''Halo: Ghosts of Onyx''', ''page 311''</ref><ref>'''Halo: Glasslands''', ''chapter 10''</ref> After the portal has been deactivated, the Huragok crew can transition the shield world back into normal space if there are no longer any threats to the shelter.
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| ==History==
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| The Sharpened Shield was constructed by the Forerunners during the [[Forerunner-Flood war]] as a fallout shelter from the firing of the Halo Array.
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| Near the end of the [[Battle of Onyx]] on [[2552#November|November 3, 2552]], Covenant [[Fleet Master]] [[Voro Nar 'Mantakree]] led his forces in an attempt to access the Sharpened Shield. However, [[SPARTAN-II Program|SPARTAN]] [[Kurt-051]] detonated a pair of [[FENRIS nuclear warhead]]s within the core room antechamber after his comrades had passed through the portal, denying the Covenant access.<ref>'''Halo: Ghosts of Onyx''', ''page 372''</ref> The human survivors, including SPARTAN-II [[Blue Team]], several [[SPARTAN-III Program|SPARTAN-IIIs]], [[Catherine Elizabeth Halsey|Dr. Catherine Halsey]], and [[Senior Chief Petty Officer]] [[Franklin Mendez]], were then seemingly trapped within the shield world. Shortly thereafter, the installation's [[Onyx Sentinel|Sentinels]] destroyed the artificial surface of Onyx.<ref>'''Halo: Ghosts of Onyx''', ''page 378''</ref>
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| When inside the shield world, the human survivors managed to establish contact between the ONI ships outside the sphere, which had already detected the cyclically fluctuating anomaly caused by the slipspace bubble but had no means to access it.<ref name="glass230"/> In [[2553#February|February 2553]],<ref name="glass372">'''Halo: Glasslands''', ''page 372''</ref> the shield world was eventually brought back into normal space by a group of [[Huragok]] that the Forerunners had left behind to maintain the structure. There was a considerable difference in the passage of time between the slipspace bubble and real space; while the survivors inside the sphere had only experienced several days, approximately three months had passed on the outside.
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| Once the Sharpened Shield had been brought back into normal space, the ONI team [[Kilo-Five]] entered the sphere. A strip of multi-colored lights activated to guide their dropship to the designated coordinates, where they would land on the surface of the shell. After a momentary blackness and a disorienting sensation for the occupants, they found themselves and their ship inside a hangar facility within the sphere's interior.<ref name="glass378"/> Halsey and the surviving Spartans were then rescued from the Sharpened Shield, but she was immediately arrested by [[Captain (Navy)|Captain]] [[Serin Osman]] for "committing acts likely to aid the enemy". Meanwhile, ONI science teams were sent in to recover Forerunner technologies from the shield world,<ref name="glass397"/> which was named "Trevelyan" in honor of Kurt-051, whose sacrifice allowed humanity to access it.<ref name="glass372"/>
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| Several days later, the former [[Shipmaster]] [[Jul ‘Mdama]], who was captured by [[Kilo-Five]], was brought to Trevelyan for interrogation by Dr. [[Magnusson]].
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| ==Trivia==
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| "The Sharpened Shield" was originally a fan-made name used on ''Halopedia''. The name had never been used in any official ''Halo'' media, though it was seemingly based on the line, ''"And bless the Reclaimers that may take refuge behind the sharpened edge of the Shield,"'' from ''Halo: Ghosts of Onyx''. However, this title was integrated into canon in the ''[[Halo Encyclopedia]]''. For more, see [[Talk:The_Sharpened_Shield#Name_v2|this discussion]].
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| ==List of appearances==
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| *''[[Halo: Ghosts of Onyx]]'' {{1st}}
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| *''[[Halo: Glasslands]]''
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| *''[[Halo: The Thursday War]]''
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| *''[[Halo 4]]'' {{Mo}}<ref>[http://www.youtube.com/watch?v=PUnnftLRSzs&feature=player_detailpage#t=284s ''PAX Prime 2012: Day 1'']</ref><ref>'''Halo 4''', ''MJOLNIR/Defender armor description''</ref>
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| ==Sources==
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| <references/>
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| {{Forerunner2}}
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| [[Category:Forerunner installations]]
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