Who wins?
By entire, I mean EVERYTHING. Halo, for example, would have all of the Precursors, Forerunners, Covenant, Flood, and Humans all teamed up against ALL the Star Wars universe
They all have their technology as well. Halo has their Halo Rings and such, Star Wars has all their Star Destroyers and Death Stars and all that
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Bringing all of the Halo arrays into the Star Wars universe and spreading them out, and setting them all off at once, would obliterate all of the opposing force. Forerunners are op as fûck.