Following Commander Shepard's destruction of the Reaper Sovereign, otherwise known to the Geth Heretics as Nazara, the Geth dispatched a new unit to better understand the destroyer of The "Old Machine", Nazara.
The unit is described as a unique geth mobile platform, designed to operate outside the Perseus Veil and interact with organics. To that purpose, it houses 1,183 geth programs, as opposed to the roughly one hundred found in other platforms, enabling it to operate independently and speak. Legion, as the unit later becomes known as, retraced Shepard's steps on Virmire, Ilos, Noveria and Feros before finding the Normandy's crash site on the planet Alchera and salvaging a piece of Shepard's N7 armor.
Legion would, much to its surprise, first encounter Shepard alive on a search for the IFF (Identify Friend/Foe) on a derelict Reaper. Legion would assist the team in fighting abominations and would eventually join Shepard's fight against the Collectors, proving to be friend not foe.
Conditions: Full Extraction on Firebase Giant Hazard vs Collector
Casual/Hardcore/Epic: Geth Infiltrator with Javelin
Veteran/Insanity/Legendary (Most representative of the unique Legion): Geth Engineer with M98-Widow, earn 5 waves survived medal
Note: Legion has Combat Drone and AI hacking which, while not exact, is most closely mirrored by the Geth Engineer with Geth Turret and Overload.
NB. For PS3 players who experience frame drops and freezes, this challenge can be completed on the Non-Hazard map. For xbox and PC, non-hazard runs will be accepted if a hazard map completion has been performed (that includes either Insanity or hardcore difficulty). Thanks!