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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People always overlook the fact that Halo AI are some of the most advanced AI in the SciFi universe. One Unsc smart Ai could cripple half a fleet if put into the right system. Also if things go bad, Just shield world and set of the halo's emerge victorious. Mop up the droids.