Tbh, I'm surprised multi team isn't a thing already. Yes, I know most of these games modes are from the Halo series
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Something like invasion mode like halo reach the closer the game is to closing ( via time or the attacking team completes the objective ) it's starts to become more mayhem So it would start normal and as it gets to the end it's mayhem Or they could add something like this in rotation with iron banner. This idea seems way more exciting tho