HELLCAT-class Mjolnir

HELLCAT-class Mjolnir is a variant of the MJOLNIR Powered Assault Armor [GEN2].

Development history
Designed using artifacts from humanity's prehistoric interstellar empire, mostly from ruins of a dead world and the vault of a shattered starship. Spartan-IIs testing the armor showed near-perfect synchronization with the armor, though compatible Spartan-IV operators required an acclimatization period and tweaks to their augmentation maintenance before deployment.

Halo 5: Guardians
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 * Helmet description: Tests with Spartan-II veterans show near-perfect synchronization with HELLCAT armor, but compatible Spartan-IV operators require an acclimatization period and tweaks to their augmentation maintenance before deployment.
 * Body description: Built of knowledge stolen from enigmatic ruins on a dead world and materials stripped from the vault of a shattered starship, the HELLCAT is both utterly alien and strangely familiar.

Trivia

 * Internally, Hellcat armor began as "A084" when it was first conceived.
 * Hellcat also (unsurprisingly) closely resembles the armor worn by human soldiers during the human-Forerunner wars.

List of appearances

 * Halo 5: Guardians