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| {{Status|Canon}} | | {{era|H2}} |
| [[File:H2A-Forerunner piston.png|thumb|250px|A closed piston within the [[Sentinel Wall]].]] | | {{ratings}} |
| A '''piston''' is a [[Forerunner]] device. They are installed within facilities like the [[Sentinel Wall]] as vertical "[[door]]s" to get from level to level within the multi-tiered construct. The pistons have sensitive control-strips that open the piston when fired upon or switched. The piston then splits in two, and allows [[Aggressor Sentinel]]s and [[Constructor]]s to move to the lower or to the higher level they desire. The openings are fairly large, however, and therefore allow larger creatures, such as [[Sangheili]], to move through. However, the shafts pistons guard are almost always vertical, so moving up through them is impossible without a thruster of some kind. Some pistons do not split in two, but the ones that reveal the winding tunnels just lift upwards, downwards and away.<ref>'''[[Halo 2]]''', campaign level ''[[Sacred Icon (level)|Sacred Icon]]''</ref> | | [[Image:Piston.jpg|thumb|right|A closed Piston]] |
| | A '''piston''' is a device that the [[Forerunners]], or perhaps the machines, left behind. They are installed within facilities like the [[Sentinel Wall]] as "doors" to get from level to level within the multi-tiered construct. The pistons have sensitive control-strips that open the piston when fired upon or switched. The piston then splits in two, and allows the [[Sentinels]] and [[Constructors]] to move to the lower or to the higher level they desire. The openings are fairly large, however, and therefore allow larger creatures, such as [[Elites]], to move through. However, the shafts pistons guard are almost always vertical, so moving up through them is impossible without a thruster of some kind. |
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| ==Trivia== | | ==Trivia== |
| *An alternative for activating the pistons besides simply pressing ''X'' is meleeing or shooting the pistons. On [[Heroic]] or [[Legendary]], pistons cannot be triggered, but must be shot or meleed. | | *On [[Heroic]] or [[Legendary]], pistons cannot be triggered, but must be shot or meleed. |
| *It takes four melees to fully activate the piston. The Piston's holocontrols change shades from green-blue to dark blue as they take more damage. | | *The piston's controls turns a darker shade of blue the more it's hit until it opens. |
| *Pistons are only present in the level [[Sacred Icon (Level)|Sacred Icon]] in ''[[Halo 2]]'' and in the level [[Nexus]] in ''[[Halo Infinite]]''.
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| *In ''[[Halo 3: ODST]]'', in the level [[Data Hive (level)|Data Hive]] which is set in [[New Mombasa]]'s [[New Mombasa Data Center|Data Center]], devices called "Data Stacks" are encountered. They function similarly to the pistons.
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| ==Gallery==
| | [[Category:The Forerunner]] |
| <gallery>
| | [[Category:Technology]] |
| File:H2-Piston_3.png|A piston in ''Halo 2''.
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| File:Piston.jpg|A [[Constructor]] accessing the holographic controls of a piston.
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| File:H2 - Piston 2.jpg|Another piston being activated by a Constructor.
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| File:HINF Nexus hunter piston.png|A piston guarded by a Banished Hunter in ''Halo Infinite''.
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| </gallery>
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| ==List of appearances==
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| *''[[Halo 2]]'' {{1st}}
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| *''[[Halo 2: Anniversary]]''
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| *''[[Halo Infinite]]''
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| ==Sources==
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| {{Ref/Sources}}
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| [[Category:Forerunner technology]] | |
