Project KEYSTONE

KEYSTONE

Production overview
Manufacturer(s):	Materials Group^[1] Misriah Armory^[2]
Type:	Prototype MJOLNIR Powered Assault Armor^[1]
Technical specifications

The KEYSTONE development program was a project undertaken by the Office of Naval Intelligence's Materials Group and Misriah Armory, with the intent of producing MJOLNIR Powered Assault Armor.^[1]^[2]

Overview[edit]

Development history[edit]

KEYSTONE was one of several armor projects undertaken by the Office of Naval Intelligence, designed to test the ever-evolving standard for the third generation of powered armor systems.^[1] The project was initiated as an evolutionary design study and later combined with elements seen on earlier iterations of the Mark VII project such as the GEN1 specification employed by Naomi-010 and the DECIMATOR for GEN2.^[3]

The Keystone design is compatible with the GEN2 platforms, and was selected by Dr. Halsey as the basis for the later Mark VII design found on the GEN3 platform.^[1]

In-game information[edit]

Halo 4[edit]

The KEYSTONE helmet was made available for use in Halo 4 as an armor permutation as part of the game's inclusion in Halo: The Master Chief Collection. The helmet is available as part of Season 7: Elite, as an Exchange-exclusive item. The helmet is free to unlock for all players, and costs 0 to purchase. It was never available in Halo 4 for Xbox 360.^[4]

Piece	Description	Unlock requirements (Halo 4)	Unlock requirements (Halo: MCC)
Helmet	Materials Group evolutionary design study that eventually formed the basis of the production Mk. VII.	N/A (MCC-exclusive)	Season 7: Elite, Purchase in The Exchange ( 0)

Gallery[edit]

Promotional images[edit]

Keyart for the Keystone helmet, featuring text, advertising the helmet's release with Season 7.
Keyart for the Keystone helmet, advertising the helmet after Season 7's launch.

Screenshots[edit]

The Keystone helmet, as seen in its icon in The Exchange.
The Keystone helmet, worn by a storm rifle-wielding Spartan-IV on Vortex.
A Spartan-IV wearing the Keystone helmet with the Eternal armor effect.

List of appearances[edit]

Halo 4 (First appearance; Master Chief Collection-only)

Sources[edit]

^ ^a ^b ^c ^d ^e Halo Waypoint, Canon Fodder - Despite Distance (Retrieved on Jun 17, 2021) [archive]
^ ^a ^b Halo Waypoint, Official Cosplay Guide: Mark VII: Page 3 (Retrieved on Jun 15, 2021) [archive]
^ Halo Waypoint, Canon Fodder - Parallel Threads (Retrieved on Jun 25, 2021) [archive]
^ Twitter, Halo (@Halo): "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." (Retrieved on Jun 17, 2021) [archive]

v • d • e

List of armor permutations by game titles

v • d • e List of armor permutations in Halo 3

Spartan armor	Bungie Armor • CQB • EOD • EVA • HAYABUSA • Mark V • Mark VI • ODST • Recon • Rogue • Scout • Security • Katana

Elite harness	Ascetic • Assault • Combat • Commando • Flight

MCC-exclusive Spartan armor	Air Assault • Aviator • COS • Compass • Deadeye • Demo • Hammerhead • Hivemind • Infiltrator • Lancer • Navigator • Nomdagro • ODST (COMM • DEMO • HVY • TAC) • Pioneer • Rhine • Soldier • Suture • Tanker • Warrior

MCC-exclusive Elite armor	Accord • Artisan • General • Keepward • Ossoona • Scion • Seneschal

v • d • e List of armor permutations in Halo: Reach

Spartan armor	Air Assault • Commando • CQB • CQC • EOD • EVA • FJ/PARA • Grenadier • GUNGNIR • HAZOP • JFO • Mark V[B] • Mark VI • Military Police • ODST • Operator • Pilot • Recon • Scout • Security • AKIS (MCC only) • Mariner (MCC only)

Spartan supplemental armor	Assault • Collar • HP • Jump Jet • Sniper • Tactical • UA • GRD (MCC only) • EXO/TSCS (MCC only)

Elite armor sets	Minor • Officer • Spec Ops • Ranger • Ultra • Zealot • General • Field Marshal

Cut armor	"Preserve"

v • d • e List of armor permutations in Halo 4

Armor	Air Assault • Aviator • CIO • Commando • Deadeye • Defender • EOD • Engineer • Enforcer • EVA • FOTUS • GUNGNIR • HAZOP • Infiltrator • Locus • Mark VI • Oceanic • Operator • Orbital • Pathfinder • Pioneer • Protector • Raider • Ranger • Recon • Recruit • Rogue • Scanner • Scout • Soldier • Stalker • Strider • Tracker • Vanguard • Venator • Warrior • War Master • Wetwork

Forearms/Legs	Contoured • GV-09 Locking • Inner-plated • LG-50 Bulk • Outer-plated • Over-locking • RG-63 Counter • Twin-plated • XG-89 Narrow • XV-27 Shifting

Champions Bundle	Bullseye Pack (Ricochet) • Infinity Armor Pack (Mark V • ODST • Prefect)

MCC-exclusive	Keystone

v • d • e List of armor permutations in Halo 2 Anniversary

Spartan armor	Centurion • Hoplite • Mark VI

Elite harness	Elite • Invader • Outrider

v • d • e

List of armor permutations in Halo 5: Guardians

Achilles • Air Assault • Anubis • Argonaut • Argus • Athlon • Atlas • Aviator • Breaker • Buccaneer • CQB • Centurion • Challenger • Cinder • CIO • Commando • Copperhead • Cyclops • Cypher • Deadeye • Decimator • Defender • Dynast • EOD • Enforcer • Engineer • EVA (GEN1 and GEN2) • Fenrir • Foehammer • FOTUS • Freebooter • Goblin • GUNGNIR • Helioskrill • Hellcat • Helljumper • Hermes • Hunter • Icarus • Indomitable • Infiltrator • Interceptor • Intruder • Jumpmaster • Legionnaire • Locus • Mako • Marauder • Mark IV • Mark V (Alpha and Delta) • Mark VI (GEN1 and GEN2) • Maverick • Military Police • Nightfall • NOBLE • Nomad • Olive • Operator (GEN1 and GEN2) • Orbital • Pathfinder • Pioneer • Pilot • Protector • Raider • Raijin • Ranger • Reaper • Recluse • Recon (GEN1 and GEN2) • Recruit • Rogue • Scanner • Scout • Security (GEN1 and GEN2) • Seeker • Shinobi • Soldier • Stalker • Stinger • Strider • Teishin • Technician • Timmy • Tracer • Tracker • Valkyrie • Vector • Venator • Venture • Vigilant • Viper • Void Dancer • Warrior • War Master • Wetwork • Wrath

v • d • e List of armor permutations in Halo Infinite

Spartan armor	Air Assault • Anubis • Aviator • Cavallino • Commando • Celox • Challenger • CQB • CQC • EOD • EVA • Grenadier • GUNGNIR • JFO • Mark V • Mark V[B] • Mark V Zeta • Mark VII • Scout • Security • Soldier • Trailblazer • Yoroi

Spartan supplemental armor	FJ/PARA • HP • SAP • TAC • UA

Other	Artificial limb • CBRN module • Command Network Module

v • d • e

List of armor permutations by generation

v • d • e GEN2

Mark variants	Mark IV (GEN2) • Mark V (GEN2 • Alpha • Delta) • Mark VI (GEN1 • GEN2 • MOD) • Mark VII (GEN2)

Variants originating from GEN1	Air Assault • Argus • Commando • Centurion • CQB • EOD GEN1 and GEN2) • EVA (GEN1 and GEN2) • GUNGNIR • HAZOP • Military Police • ODST (GEN2) • Operator (GEN1 and GEN2) • Orbital • Pilot • Raider • Ranger • Recon (GEN1 and GEN2) • Rogue • Scout • Security (GEN1 and GEN2) • Strider • Venator

Variants based on GEN1	Indomitable • Intruder • NOBLE • Vigilant • Wrath

New variants	Achilles • Anubis • Argonaut • Athlon • Atlas • Aviator • Barvo • Breaker • Challenger • Cinder • CIO • Copperhead • Cyclops • Cypher • Deadeye • Decimator • Defender • Dynast • Enforcer • Engineer • Fenrir • Foehammer • FOTUS • Freebooter • Goblin • Helioskrill • Hellcat • Helljumper • Hermes • Hunter • Icarus • Infiltrator • Interceptor • Jumpmaster • KEYSTONE • Legionnaire • Locus • Mako • Marauder • Maverick • Mirmillion • Nightfall • Nomad • Oceanic • Pathfinder • Pioneer • Prefect • Protector • Raijin • Reaper • Recluse • Recruit • Ricochet • Scanner • Seeker • Soldier • Stalker • Stinger • Teishin • Technician • Tracer • Tracker • Valkyrie • Vanguard • Vector • Venture • Viper • Void Dancer • Warrior • War Master • Wetwork

Forearms/Legs	Contoured • GV-09 Locking • Inner-plated • LG-50 Bulk • Outer-plated • Over-locking • RG-63 Counter • Twin-plated • XG-89 Narrow • XV-27 Shifting

Other	Buccaneer • Olive • Shinobi • Timmy

For a complete list, check out our MJOLNIR armor directory.

Project KEYSTONE

Contents

Overview[edit]

Development history[edit]

In-game information[edit]

Halo 4[edit]

Gallery[edit]

Promotional images[edit]

Screenshots[edit]

List of appearances[edit]

Sources[edit]

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