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The ATHLON helmet's inner layer uses a magnetorheological dampening system perfectly tuned to the peculiarities of Spartan physiology.
— In-game description.
Halo 5: Guardians Multiplayer BetaEdit
In the Halo 5: Guardians multiplayer beta, the helmet is unlocked at SR-19 and body armor at SR-20.
- Athlon currently has the most armor skins in Halo 5: Guardians.
- Halo 5: Guardians (First appearance)