We haven't seen the arbiter since Halo 3. Do you guys think he'll come back in Halo 5 or 6 to fight the UNSC?
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He'll be back for sure. But he won't be our enemy. Unless things have changed since the Thursday War most of the elites are still allied with humanity with the Arbiter as their leader. The elites we fight in Halo 4 are a rebel faction that want to continue fighting the humans and overthrow the Arbiter.