Who do you think would win if the Protoss from the Starcraft series, and the covenant from the Halo series got locked in an all-out intergalactic war? They are both very fierce, battle-hardened, and technologically advanced alien races with huge armies. Cast your vote here.
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A single human took down the Covenant. The Protoss are the second most dominant force in the [b]universe[/b] (Zerg). You do the math.