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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The Fallen exist on 3/4 planets. By that logic they're the most successful where the Cabal are the least.