From Halopedia, the Halo wiki
Technicians have found scrapcode buried in the FENRIR's neural interface controller that does not conform to any known programming language.
The permutation's "bloodthirsty" battle management AI could be a direct reference to the suit's namesake.
Halo 5: Guardians
Unlock: Uncommon REQ card
Unchained Unlock: Rare REQ card
List of appearances