What i'm asking here is, what enemy faction has had the most success in our solar system, which faction stands tall above the rest, and still hold a high ranking throughout space.
Edit: Wow 442 Votes Total, It seems the Vex truly are the most dangerous foe for the Vanguard.
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Vex can warp, alter, and use time to their advantage. Your poll is invalid. Just kidding but I think they're all every matched when it comes down to it. I still see the little baby aliens barely damaging one another on patrol, lol. Too bad Mr. Guardian of Light had to drop in and wreck them.