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B-class Mjolnir

From Halopedia, the Halo wiki

GEN1 Mark V
B-class Mjolnir from Halo: Reach armor permutation in Halo: The Master Chief Collection menu.
GEN1 Mark IV
Production overview


Materials Group



MJOLNIR (GEN3) (compatible)


The MJOLNIR Powered Assault Armor/B variant refers to two distinct sub-models of MJOLNIR Powered Assault Armor, created for the Mark IV and Mark V generations.[1] The latter iteration of the [B] variant served as the initial production model of the Mark V MJOLNIR Powered Assault Armor.[2]



While its physical architecture is derived from the Mark IV(b), the Mark V[B] was the first mainline model of the MJOLNIR Powered Assault Armor to incorporate energy shielding technology.[3] The Mark V[B] is largely similar to the final version of the Mark V. The only major difference between the two is the [B] variant's lack of an accompanying upgrade to the wearer's neural lace enabling the wearer to interface with a smart AI. This did not come to fruition until John-117 and Cortana successfully tested the final Mark V on August 29, 2552.[2][4]

Development history[edit]

Along with the Security and Rogue variants, the Mark V[B] was designed and manufactured by private organizations hired by the UNSC rather than developed by the Materials Group due to numerous problems with funding.[verification needed] The development of Mark V[B] was conducted in secret, with its prototypes tested by Spartan-III personnel.[4] The physical architecture of two later MJOLNIR variants, Mjolnir Mark VII prototypes and DECIMATOR-class Mjolnir, closely resembled the design of Mark V[B].


The Mark IV(b)'s first known use was by Frederic-104 during an operation against Insurrectionists sometime before the Battle of Circinius IV on April 26, 2526. Fred continued to wear the armor during this battle when Blue Team was sent to evacuate the survivors from the Corbulo Academy of Military Science.[5] The Mark V[B] entered service with the Spartan-IIs and select Spartan-IIIs on November 24, 2551.[2] The Mark V[B] helmet's only adopter was SPECWAR Group Three.[6] Mark V[B] was the standard Mjolnir variant issued to Spartans assigned to SPECWAR Group Three, including NOBLE Team. While most members of NOBLE Team modified their Mark V[B] suits to varying extents, Thom-A293 wore a full, unaltered set of Mark V[B] armor.[7] Thom's replacement, SPARTAN-B312, also wore a largely unaltered set of Mark V[B] armor.[8] A replica of B312's helmet was later hosted for display in the Outpost Discovery program, following the war's end.[9]

Because the Mark V[B] helmet was not used outside SPECWAR Group Three, the standard helmet worn with the Mark V[B] was instead based on the architecture of the original Mark IV model.[6] This would later be used as the basis of the final iteration of the Mark V helmet.[4]

By 2560 Spartans were using Mjolnir Mark V(B) platforms upgraded to GEN3 standards.[10]

In-game information[edit]

Halo: Reach[edit]

"The Mk.V[B] helmet is one of several 'privatized' variants of previously classified war material."

The Mark V[B] is the default suit of armor in Halo: Reach.[2] The second generation of the Mark V is seen in Halo: Combat Evolved.[4] This helmet is the starting helmet for all players, and is purchased and equipped by default. The helmet is the only component of the set that can be specifically selected in the armory. In Halo: The Master Chief Collection, the helmet variants are attainable in the Season 1: Noble progression system, with an additional robot arm variant of the chest introduced in Season 5: Anvil.

Armor Description Unlock requirements (Halo: Reach) Unlock requirements (Halo: MCC)
HR Default Visor Icon.png
Mark V[B] helmet
Entered service in 2551; UNICOM/ SPECWAR/ GroupTHREE has been the sole adopter. 0 cR - Default Unlocked by default
HR MarkVB UA Helmet Icon.png
Mark V[B] helmet UA attachment
Up-armored variant of the base Mk.V[B] pattern helmet. Halo: Reach rank icon Recruit, 750 cR Season 1, Tier 4 (Season point 1)
HR MarkVB UAHUL Helmet Icon.png
Mark V[B] helmet UA/HUL attachment
Up-armored variant with hardened uplink module for MILINT acquisition. Halo: Reach rank icon Corporal, 1,500 cR Season 1, Tier 15 (Season point 1)
HR Default Chest Icon.png
Default chest
Restore your equipment to its default state. 0 cR - Default Unlocked by default
HR Default LShoulder Icon.pngHR Default RShoulder Icon.png
Default shoulders
Restore your equipment to its default state. 0 cR - Default Unlocked by default
Default knees Restore your equipment to its default state. 0 cR - Default Unlocked by default
HR Default Wrist Icon.png
Default wrist
Restore your equipment to its default state. 0 cR - Default Unlocked by default
HR Default Utility Icon.png
Default utility
Restore your equipment to its default state. 0 cR - Default Unlocked by default
HR DefaultR Chest Icon.png
Default [R] chest
Mil-spec prosthetic limb and standard-issue chestplate. N/A Season 5 Tier 25, Season point 1

Halo Infinite[edit]

"Forged before the fall of Reach."

The MARK V [B] is the default suit of armor for the MARK V [B] armor core in Halo Infinite.

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Armor Description Rarity Unlock requirements
A player in GEN3 Mark V(B) wanting to Fortnite dance.
MARK V [B] helmet
Armory: Materials Group

Description: Developed and tested in the last year of the Covenant War, the MARK V [B] saw extensive use with the Spartans assigned to UNICOM during the fall of Reach.

Common Default for MARK V [B] armor core
Armory: Materials Group

Description: Standard-issue shoulder armor.

Common Default for MARK V [B] armor core.
MARK V [B] gloves
Armory: Materials Group

Description: Every Spartan glove was a miraculous combination of sensors, myomer, and armor weaves.

Common Default for MARK V [B] armor core.
UA/Type KT
Armory: Materials Group

Description: Supplemental leg armor.

Common Default for MMARK [B] armor core.

Production notes[edit]

The Mark V[B] shoulder plate as seen in Halo: Reach Beta. The pauldron becomes the FJ/PARA variant in the final game.
  • In the Halo: Reach Multiplayer Beta, there were two upgrades available for the Mark V[B] helmet. An Command Network Module or "CNM", standard issue to Special Forces unit commanders (1000 cR), and an Hardened Uplink or "HUL", required for sensitive operations (5000 cR).[11] The CNM and HUL attachments as seen in the Beta were merged into a single attachment, the UA upgrade, for the final game. The HUL is now an additional camera/sensor-like attachment on the side of the helmet, rather than being located on the top.
  • In the Halo: Reach Multiplayer Beta, the now-FJ/PARA shoulder pieces were designated as Mark V[B]. In the final game, the Mark V[B] shoulder pauldron refers to the default state of the shoulder pauldron, with the FJ/PARA shoulder pieces in the Beta being renamed into UA/Multi-Threat to make space for the move of the then-Mark V[B] shoulder pauldrons to the current FJ/PARA shoulder pauldrons.[6]
  • Fred-104's Mark IV(b) armor in Halo 4: Forward Unto Dawn was kitbashed from the Mark V[B] suit used in Deliver Hope. The armor was later canonized as Mark IV(b) on Halo Waypoint.


List of appearances[edit]