All of the Tenno vs all of the Guardians.
Who'd come out on top?
Incase you don't know who the Tenno are...
[spoiler][url=https://m.youtube.com/watch?v=4uXEOXX6ZAo][/url]a quick look at 4 tenno[/spoiler]
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Just make rhino Primo into a Cabal and make him the final boss of next expansion... that would be a good fight!