Legion is a collective of 1,183 Geth programs inhabiting a unique "mobile platform". The physical platform is just a shell for the collective consciousness and like other Geth to inhabit. Legion is unique due to the increased amount of Geth programs actively running inside the mobile platform, this makes him more intelligent as the more Geth minds there are, the more intelligent the unit.
Powers and Stats
Tier: At least 9-B with firearms, around High 8-C with physical strikes, 8-A with Tech abilities
Origin: Mass Effect
Classification: Synthetic/Robot, Geth
Powers and Abilities: Superhuman Physical Characteristics, Multiple Personalities Expert Marksman, Expert Grenadier, Expert Hand-To-Hand Combatant, Forcefield (in the form of Kinetic Barriers), Hacking (In the form of AI Hacking), Combat Drone, Geth Shield Boost
Attack Potency: At least Wall level with mass accelerator weaponry (Slugs fired by mass accelerator weapons can reduce large chunks of rock wall to rubble in a couple dozen rounds as demonstrated by the YMIR mech during the assignment N7: Mining the Canyon), Around Large Building level with physical strikes, Multi City Block level with Tech Abilities.
Speed: Massively Hypersonic (Comparable to James Vega).
Lifting Strength: At least Class 10
Striking Strength: Unknown, likely Large Building Class
Durability: At least Large Building level without kinetic barriers via powerscaling; at least City Block level with kinetic barriers.
Range:Several dozen kilometers with mass accelerator weaponry, average melee range with punches, dozens of meters with tech abilities.
Standard Equipment: An assault rifle, a sniper rifle and an omni-tool.
Intelligence: Genius. A skilled fighter. Has the processing power of over a thousand Geth minds working together simultaneously. The processing power is enhanced even further with Reaper code.
Weaknesses: Kinetic barriers fail to deflect attacks with a high enough energy to surface area ratio (Can safely deflect high-velocity projectiles in-universe, but fail to be effective against in-universe melee attacks and directed energy weapons). The shielding of kinetic barriers does not protect against extremes of temperature, toxins, or radiation.