Canon

PREFECT-class Mjolnir

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A Prefect-clad Spartan-IV on Chasm.
“ A handful of critical discoveries have led to this extraordinary hybridization of human and Forerunner technology. ”
Prefect
GEN3
Icon for the Prefect helmet.
GEN2
The Prefect armour as rendered in MCC.
Production overview

Manufacturer(s):

Watershed Division, Office of Naval Intelligence (RF Trevelyan)

Testing site(s):

Denegroth, West Conamara, Europa, Jupiter

Type:

Technical specifications

Feature(s):

Incorporates Forerunner armor technology

 

PREFECT-class Mjolnir is a variant of the MJOLNIR [GEN2] and MJOLNIR [GEN3][1] manufactured by the Watershed Division. It is reverse-engineered from the personal armor worn by Forerunner Prefects.[2]

GEN2 overview[edit]

Design details[edit]

The GEN2 Prefect armor is based on the Forerunner Combat skin used by the Prefects, a class of Warrior-Servants in the Ecumene.

Development history[edit]

Research on the Forerunner shield world now called Trevelyan has cultivated numerous findings for the Office of Naval Intelligence. One of the most practical has been the discovery of a native armor system utilized by Forerunner Prefects late in their civilization's history. The Watershed Division leveraged local Huragok to reverse-engineer the original designs, grafting the abandoned armor system into baseline Mjolnir standards for Spartan-IV use.[2] It was tested at Denegroth, West Conamara, on Europa.[3]

GEN3 overview[edit]

Design details[edit]

The GEN3 Prefect helmet is compatible with the "Odin's Eye", an hyperscanner developed by the Watershed Division that allows the user a real-time environment analysis and the detection of baffler camouflage.[4] The armor is built on the same exotic materials from which the Promethean Knights are built.[5]

Development history[edit]

Like its GEN2 predecessor, the GEN3 Prefect armor was developed by the Watershed Division. By 2560, and after several years of testings, revisions, several discoveries on Forerunner technologies, and setbacks, ONI was finally prepared to deploy the Prefect armor as a technological demostration of fusing human powered armor and Forerunner combat skins.[6]

In-game information[edit]

Halo 4[edit]

Prefect is one of the three armors from the Infinity Armor Pack. Like the other two armor sets, it is not usable in Spartan Ops in Halo 4. Although the Prefect was unavailable during initial release in The Master Chief Collection, it was made available in Series 7: Elite.

Piece Description Unlock requirements (Halo 4) Unlock requirements (Halo: MCC)
HTMCC H4 Prefect Helmet Icon.png
Helmet 		Description (H4 and MCC): A handful of critical discoveries have led to this extraordinary hybridization of human and Forerunner technology.

MANUFACTURER: The Watershed Division

Purchase the Infinity Armor Pack. Series 7 Tier 36, Spartan Point 1
HTMCC H4 Prefect Chest Icon.png
Chest 		Series 7 Tier 47, Spartan Point 1
HTMCC H4 Prefect LShoulder Icon.pngHTMCC H4 Prefect RShoulder Icon.png
Shoulders 		Series 7 Tier 77, Spartan Point 1
HTMCC H4 Prefect Forearm Icon.png
Forearms 		Series 7 Tier 56, Spartan Point 1
HTMCC H4 Prefect Leg Icon.png
Legs 		Series 7 Tier 64, Spartan Point 1

Halo Infinite[edit]

The Prefect armor returned and was made available for multiplayer Spartan armor customization in Halo Infinite, returning in the aptly named Forerunner Operation. Prefect is primarily available through the Mark VII armor core.

Armor Manufacturer Lore Rarity Introduced In Unlock Requirements
Icon for the Prefect helmet.
PREFECT 		Watershed Division After years of testing, revision, discoveries, and setbacks, ONI is finally prepared to widely deploy a fusion of human powered armor and Forerunner combat skin. Legendary Forerunner Forerunner Operation Pass level 20
Icon for the Prefect helmet attachment.
Odin's Eye 		Odin's Eye, reverse-engineered from a War Sphinx sensor cluster, incorporates ultra-tech capabilities that allow for hyperscanner environmental analysis in real-time and anti-baffler camouflage detection.
Icon for the Prefect chest.
UA/Prefect 		Constructed of the same exotic materials as a Promethean Knight. Forerunner Operation Pass level 15
Icon for the Prefect shoulders.Icon for the Prefect shoulders.
UA/Prefect 		Each Prefect set is proof of humanity's inexorable march towards full exploitation of the Forerunner legacy. Forerunner Operation Pass level 18
Icon for the Prefect wrist.
UA/Prefect Buckler 		Forerunner materials bent to human will. Purchase from The Exchange for Spartan Point 9,000
Icon for the Prefect utility.
TAC/Gravspinner 		Gravitic compensators embedded in these plates are currently deactivated after a series of lethal calibration experiments. Forerunner Operation Pass level 10
Icon for the Prefect knee guards.
UA/Prefect Kneeguards 		Impossibly lightweight and terrifyingly resilient. Forerunner Operation Pass level 5

Production notes[edit]

"Initially when I started out on this, I did experiment a bit with fusing the typical Halo 4 'armor noise' into a 'loose' interpretation of Issac's design then swung into a more direct interpretation with simpler shapes. Alot of the simple designs had some very nice chunky, unique silhouette breaking shapes, which I thought would have been a nice break from the typical collection of Halo armors, but eventually alot of the pieces were broken up and shrunk down to fit more snugly against the frame and avoid any unwanted collision..."
— Sean Bigham, describing the design process for Prefect.[7]

The Prefect variant was based on Halo: Chronicles concept art for a "Promethean" (unrelated to the Prometheans now-known in canon) by Isaac Hannaford. It was designed for Halo 4 by concept artist Sean Bigham.[7]

The first trailer for the Champions Bundle DLC showed the Prefect armor with a different design on the armor's wrists, an added decal for Chalybs Defense Solutions on the helmet's forehead, and the player's secondary color applied to their player model's fingertips. These would be altered for the DLC's launch.

  • The original Prefect armor skin design, seen in the Champions Bundle trailer.

    The original Prefect armor skin design, seen in the Champions Bundle trailer.

  • The final Prefect armor skin design, seen in the Champions Bundle Launch Trailer.

    The final Prefect armor skin design, seen in the Champions Bundle Launch Trailer.

Gallery[edit]

Main-Superintendent.png Browse more images in this article's gallery page.

Developmental images[edit]

  • A piece of Halo: Chronicles concept art that inspired Prefect's design.

    A piece of Halo: Chronicles concept art that inspired Prefect's design.

  • Concept art of the Prefect armor.

    Concept art of the Prefect armor.

Halo 4[edit]

  • Prefect (right) alongside the other two armors in the Infinity Armor Pack.

    Prefect (right) alongside the other two armors in the Infinity Armor Pack.

  • Front view of the armor.

    Front view of the armor.

  • Back view of the armor.

    Back view of the armor.

  • A Prefect-clad Spartan wielding a Z-130 Suppressor on Vertigo.

    A Prefect-clad Spartan wielding a Z-130 Suppressor on Vertigo.

  • A Prefect-clad Spartan-IV on Forge Island, reloading a Z-250 lightrifle.

    A Prefect-clad Spartan-IV on Forge Island, reloading a Z-250 lightrifle.

  • A Prefect-clad Spartan sprinting with a Z-130 Suppressor.

    A Prefect-clad Spartan sprinting with a Z-130 Suppressor.

  • A Prefect-clad Spartan wielding a Z-130 Suppressor.

    A Prefect-clad Spartan wielding a Z-130 Suppressor.

  • A Prefect-clad Spartan reloading a Z-110 Boltshot.

    A Prefect-clad Spartan reloading a Z-110 Boltshot.

  • A Prefect-clad Spartan deploys a Z-90 hardlight shield.

    A Prefect-clad Spartan deploys a Z-90 hardlight shield.

Halo Infinite[edit]

  • A Prefect-clad Spartan in a promotional image for Forerunner.

    A Prefect-clad Spartan in a promotional image for Forerunner.

  • A Prefect-clad Spartan with a Promethean Assault Rifle.

    A Prefect-clad Spartan with a Promethean Assault Rifle.

  • A Prefect-clad Spartan with the Odin's Eye attachment.

    A Prefect-clad Spartan with the Odin's Eye attachment.

  • A Prefect-clad Spartan with the Odin's Eye attachment.

    A Prefect-clad Spartan with the Odin's Eye attachment.

  • A Spartan-IV clad in Prefect armor on Chasm.

    A Spartan-IV clad in Prefect armor on Chasm.

  • The same Spartan-IV utilizing the Odin's Eye helmet attachment.

    The same Spartan-IV utilizing the Odin's Eye helmet attachment.

List of appearances[edit]

Sources[edit]

  1. ^ a b Twitter, Halo (@Halo): "The Prefects are a class of Warrior-Servants tasked with investigating threats to the Forerunner ecumene, their combat skin has been adapted and integrated with both GEN2 and GEN3 Mjolnir platforms. #FictionFriday" (Retrieved on Apr 11, 2025) [archive]
  2. ^ a b WorthPlaying, 'Halo 4' (X360) Champions Bundle To Add New Maps, Mode, Skins, Armor, Bonus Upgrades - Screens (Retrieved on Jun 26, 2022) [archive]
  3. ^ Halo Waypoint, The Halo Bulletin: 7.10.13 (Retrieved on Nov 26, 2013) [archive]
  4. ^ Halo Infinite, Armor Hall: Odin's Eye - Helmet Attachment Description "Odin's Eye, reverse-engineered from a War Sphinx sensor cluster, incorporates ultra-tech capabilities that allow for hyperscanner environmental analysis in real-time and anti-baffler camouflage detection."
  5. ^ Halo Infinite, Armor Hall: UA/Prefect - Chest Description "Constructed of the same exotic materials as a Promethean Knight."
  6. ^ Halo Infinite, Armor Hall: Prefect - Helmet Description "After years of testing, revision, discoveries, and setbacks, ONI is finally prepared to widely deploy a fusion of human powered armor and Forerunner combat skin."
  7. ^ a b DeviantArt, Halo 4: Champions DLC - Prefect Armor Concept (Retrieved on Oct 10, 2021) [archive]

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List of armor permutations by game title

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List of armor permutations in Halo 4
Armor
Forearms/Legs
Cut armor
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List of armor permutations in Halo Infinite
Spartan armor
Mark VII Achilles • Agitator • Anubis • Armet • Argus • Aviator • Barrister • Brawler • Camazotz • Cavallino • Celox • Cestus • Champion • Cohort • Copperhead • Courier • Deadeye • Dirgesinger • Dokkaebi • Dominar • Eclipse • Emissary • Enigma • Firefall • Fire Serpent • Flanker • FOTUS• Hawker • Hayabusa • Helioskrill • Helljumper • Helsinger • Hermes • Hunter • ISR • Kai-125 • Linebreaker • Magister • Mark V Zeta • Mark VI • Mark VI MOD • Mark VII • Mark VII [H] • Menachite • Mercury • Prefect • Raider • Rampart • Renegade • Riz-028 • Rockeye • Scanner • SECOPS • Security GEN1 • Security GEN3 • Shinobi • Soldier • Sovereign • Spartanstein • Stormfall • Talon • Thremaleon • Trailblazer • Trendlock • Tribune • Trooper • Torchbearer • Tormenter • Vannak-134 • Venator • Vindicator • Volant • War Master • Warmonger • Wetwork • Winterknight • XM55 AICH • Zvezda
Mark V [B] Air Assault • Commando • CQB • CQC • EOD • EOD GEN1 • EVA • EVA GEN1 • Grenadier • GUNGNIR • HAZOP • JFO • Liberator • Mark V • Mark V [B] • Mark VI • Military Police • ODST • ODST Hardshell • Operator • Pilot • Recon • Rogue • Scarred Comet • Scout • Scout GEN1 • Security
Rakshasa AKIS II-GRD • Artaius • Assailer • Bunyip • Cambion • Conqueror • Cutthroat • Direwolf • Echo Nine • Firbolg • Lechuza • Locus • Morrigan • Negotiator • Rakshasa • Rasetsu • Scorn • Shikari • Stribog • Taskmaster • Ullr • Viper
Mirage IIC Athlon • Balor • Belus • Bruma • Erinyes • Extender • Hermes IIC • Inciter • Infractor • Mirage IIC • Neith • Nexus • Orion IIC • Responder • Savage • Skymarcher • Squire • Street Viper • Tyro • Veles • Whisper
HAZMAT Ashmaw • Burrowlens • Exo • Farkas • Gourdian Knight • Mark VI CBRN • Notus • Oberon • OSTEO • Ogun • Project CORSAC • Serket • Skarbnik • Steelheart • Temfor • Voidspear
Mark IV Ardent • Emil • Heartguard • Hellcat • Isidor • Lancer • Mark IV • Orcus • Paladin • Theodor • Ulrich • Valiant • Wilhelm • Xantippe • Ypsilon • Zacharias • Ärger • Ökonom
Spartan armor accessories
AAP • FC • FCI • SAP • TAC (Assault) • UA (Collar • Type FJ) • UTIL (HP)
Other
Fractures Spartan armor
Yoroi Azechi • Chonmage • Hakushika • Hikeshi • Ikari • Jingasa • Kabuto • Kawari • Kendo • Otomosho • Yokai
Eaglestrike Boggart • Brodie • Eaglestrike • Kerberos • Lancejack • Leadbelcher • M199X • Sky Marshal
Chimera Abatur • Aristos • Chimera • Deltajock • Flenser • Fomorian • Geist • Grendel • Grimghast • Merrow • Mimir • Peaceweaver • Rectifier • Strigoi • Sundered Star • Thresher • Wendigo
For a complete list, check out our armor category.

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List of armor permutations by generation

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MJOLNIR Powered Assault Armor
Mainline armor generations
Mark I • Mark II • Mark III • GEN1 (Mark IV • Mark V • Black • Mark VI • Mark VII) • GEN2 • GEN3
Armor components
Competing and related projects
ARTAIUS • Buccaneer • COBALT • HAYABUSA • HRUNTING • MELAENO • Mirage • OSTEO • Rakshasa • Orcus • Shinobi • SPI • YGGDRASIL
Armor permutations (by generation)
Supplemental equipment
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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 • EOD • EVA • GUNGNIR • HAZOP • ODST • Operator • Orbital • Raider • Ranger • Recon • Rogue • Scout • Security • Strider • Venator
Variants based on GEN1
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 • Oppressor • 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
Other
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GEN3
Mark variants
Mark V (Zeta) • Mark VI (GEN3 • MOD) • Mark VII (GEN3)
Variants based on GEN1
Variants based on GEN2
New variants
For a complete list, check out our MJOLNIR armor category.
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