The Phönix (フォニクス, Fonikusu?) is a High-Mobility Type Legion unit excelling in stealth and close-quarters combat. The Phönix was first discovered by the Eighty-Sixth Strike Package during the Charité Underground Labyrinth Operation. Presumably, it is one of the Legion units not originally developed by the Giadian Empire.
The Phönix is capable of greatly outperforming its contemporaries and the XM2 Reginleif in melee. Its ability to camouflage itself using a swarm of Eintagsfliege renders it undetectable, while its agility and mobility allows it to swiftly strike with its two high-frequency chain blades. The Phönix's weakness lies in its light armor, having sacrificed protection for speed. A Phönix was able to be defeated by Shinei Nouzen using a rifle firing a barrage of 7.62 mm armor-piercing rounds, a nigh impossible feat to be performed on other Legion units. The previously defeated Phönix which reappeared in the Dragon Fang Mountain Operation was protected in a coat of liquid armor in order to somewhat remedy its flaws.