"The true nature of the Warframes and their Tenno connection is a secret lost to the Old War. Together, they represent our best hope in turning the tide of the machine war. Warframes are unique from Dax and other Infantry, deploying dangerous and esoteric Void energy, and equipped with often mundane physical weapons – this is key to fighting an enemy that had turned our technology against us." —"Warframes" Fragment

A mysterious weaponized armor controlled solely by the Tenno. Through the Warframe, Tenno can cheat death, channel the forbidden Void energies and face scores of enemies without fatigue. Due to apparent resistances of their Bio-Metal exoskeletons, Warframes can be safely deployed to Infestation Outbreaks, should they occur. In-depth information of the Warframe mandate is forbidden to all but the Seven.
—Warframe Technology Fragment

Warframes are the biomechanical warriors controlled by the Tenno in the titular game, Warframe.

Warframes vary greatly in aesthetics, but are consistently eyeless and appear to be mouthless, despite accounts in-lore of Warframes consuming flesh, or other substances. While some Warframes can act of their own will, the majority seen within the game are almost completely inanimate without the influence of the Tenno to control them via transference.

Currently there are 57 Warframes, not counting alternate skins or primes.