"Frigga" Thunder Fox

The Thunder Fox is a medium Quad BattleMech that was produced at the end of the Jihad, thanks to an engineer named Lara Harman. Harman, a former Mitchell Vehicles designer, secretly - and principally - combined the Blue Flame Quad 'Mech's design specs with other Blakist designs to conceive the Thunder Fox. The design became popular with the newly formed Republic of the Sphere. It was later exported to the Draconis Combine and Lyran Commonwealth.

By the 3130s, the design fell into the hands of many of the splinter groups or pirates that ravaged the Republic of the Sphere after the HPG Blackout. These included the Steel Wolves, the Swordsworn, and the Spirit Cats.