COS-class Mjolnir

"ANVIL cyber operations specialists use this chassis to mount experimental counter-intrusion modules."

- Official description

COS-class Mjolnir is an experimental variant of MJOLNIR [GEN2] armor, which was approved for testing on ANVIL Station.

Development history
COS-class was tested on ANVIL Station, where the station's cyberintrusion specialists used the armour to test experimental counter-intrusion modules.

In-game information
The COS armor set was first introduced into Halo 3's MCC port along with six other new armor sets, as part of Season 6. It was never available in Halo 3 for Xbox 360.

Production notes
The COS armor set was originally created as a useable armor permutation for Halo Online, a cancelled Halo 3-derived multiplayer game developed by Saber Interactive and Innova Systems which was intended to be released exclusively in Russia for the PC. After the game's cancellation in 2016, the armor was one of six sets added to Halo 3 in The Master Chief Collection as part of the game's sixth season in 2021.

List of appearances

 * Halo 3