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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Since I respect both I'm going to ask questions: Would the Jedi/Sith just be throwing their force abilities around or would they be like their movie counterparts and only use it in viable situations? Can an energy sword stand against a lightsaber or vise versa? Would the entire Star Wars universe team up and fight an entire teamed up halo alliance? That seems unlikely so it seems like it would be Jedi vs Sith then suddenly a covenant fleet swoops in or UNCS vs Covenant then empire comes in.