View source for Project KEYSTONE

{{Status|Canon}}
{{Seealso|Keystone}}
{{Armor infobox
|name=KEYSTONE
|image=[[File:HTMCC H4 MarkVII Keyart.jpg|300px]]
|manufacturer=[[Materials Group]]{{Ref/Reuse|CFDespite}}<br>
[[Misriah Armory]]{{Ref/Site|Id=MarkVIICosplay|URL=https://content.halocdn.com/media/Default/community/CosplayGuides/mk7_cosplayguide_fullsize-a95f71a129ae4094aef3ea0b6121fca4.pdf|Site=Halo Waypoint|Page=Official Cosplay Guide: Mark VII|Detail=Page 3|D=15|M=6|Y=2021}}
|testsite=
|type=Prototype [[MJOLNIR Powered Assault Armor]]{{Ref/Reuse|CFDespite}}
|role=
|weight=
|features=
}}
The '''KEYSTONE development program''' was a [[:Category:UNSC projects|project]] undertaken by the [[Office of Naval Intelligence]]'s [[Materials Group]] and [[Misriah Armory]], with the intent of producing [[MJOLNIR Powered Assault Armor]].{{Ref/Reuse|CFDespite}}{{Ref/Reuse|MarkVIICosplay}}

==Overview==
===Development history===
KEYSTONE was one of several armor projects undertaken by the Office of Naval Intelligence, designed to test the ever-evolving standard for the [[MJOLNIR Powered Assault Armor (GEN3)|third generation]] of powered armor systems.{{Ref/Reuse|CFDespite}} The project was initiated as an evolutionary design study and later combined with elements seen on earlier iterations of the [[MJOLNIR Powered Assault Armor/Mark VII|Mark VII]] project such as the GEN1 specification employed by [[Naomi-010]] and the [[DECIMATOR-class Mjolnir|DECIMATOR]] for [[MJOLNIR Powered Assault Armor (GEN2)|GEN2]].{{Ref/Site|Id=CFParallel|URL=https://www.halowaypoint.com/en-us/news/parallel-threads|Site=Halo Waypoint|Page=Canon Fodder - Parallel Threads|D=25|M=6|Y=2021}}

The Keystone design is compatible with the [[MJOLNIR Powered Assault Armor (GEN2)|GEN2]] platforms, and was selected by [[Catherine Halsey|Dr. Halsey]] as the basis for the later Mark VII design found on the [[MJOLNIR Powered Assault Armor (GEN3)|GEN3]] platform.{{Ref/Site|Id=CFDespite|URL=https://www.halowaypoint.com/en-us/news/despite-distance|Site=Halo Waypoint|Page=Canon Fodder - Despite Distance|D=17|M=6|Y=2021}}

==In-game information==
===''Halo 4''===
The KEYSTONE helmet was made available for use in ''[[Halo 4]]'' as an [[Armor customization (Halo 4)|armor permutation]] as part of the game's inclusion in ''[[Halo: The Master Chief Collection]]''. The helmet is available as part of [[Series 7: Elite]], as an [[The Exchange|Exchange]]-exclusive item. The helmet is free to unlock for all players, and costs {{SeasonPoint|0}} to purchase. It was never available in ''Halo 4'' for [[Xbox 360]].{{Ref/Twitter|Halo|1405601698161336320|Halo|Quote=Make sure it fits just right. Next week in MCC with the arrival of Season 7, don't miss your chance to grab the #HaloInfinite Inspired Mk. VII Helmet for Halo 4.|D=17|M=6|Y=2021}}

{| class="wikitable" style="width: 75%;"
! style="width: 15%"|Piece
! style="width: 40%"|Description
! style="width: 15%"|Unlock requirements (''Halo 4'')
! style="width: 30%"|Unlock requirements (''Halo: MCC'')
|- align="center"
|[[File:HTMCC H4 Keystone Helmet Icon.png|100px]]<br>Helmet
|Materials Group evolutionary design study that eventually formed the basis of the production Mk. VII.
|N/A {{C|''MCC''-exclusive}}
|[[Series 7: Elite]], Purchase in The Exchange ({{SeasonPoint|0}})
|}

==Gallery==
===Promotional images===
<gallery>
File:HTMCC H4 MarkVII Keyart - With Text.jpg|Keyart for the Keystone helmet, featuring text, advertising the helmet's release with Season 7.
File:HTMCC H4 MarkVII Keyart - 00002.jpg|Keyart for the Keystone helmet, advertising the helmet after Season 7's launch.
</gallery>

===Screenshots===
<gallery>
File:HTMCC Exchange Keystone Icon.png|The Keystone helmet, as seen in its icon in The Exchange.
File:HTMCC - Keystone on Vortex.jpg|The Keystone helmet, worn by a [[Kelos'vaarda-pattern storm rifle|storm rifle-wielding]] [[Spartan-IV]] on [[Vortex]].
File:MCC-H4 ImpactKeystone.png|A Spartan-IV wearing the Keystone helmet with the Eternal [[armor effect]].
File:H4-Keystone-Helmet-GEN2-Spartan-Ops.png|A Keystone-clad [[Spartan (multiplayer)|Spartan]] interacting with a [[Forerunner]] console.
</gallery>

==List of appearances==
*''[[Halo 4]]'' {{1st|MCC}}

==Sources==
{{Ref/Sources}}

{{Armor/Permutation|H4}}
{{Navbox/Universe/Mjolnir|Overview|GEN2}}
[[Category:MJOLNIR armor|KEYSTONE]]
[[Category:Halo 4 multiplayer armor permutations|KEYSTONE]]