Grouped Reclaimer/Shutdown because 7 and IMO those were the two worst.
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Forerunner. Forerunner was as classic as Halo 4 got, it reminded me a-lot of Halo 2 and Halo: CE. You had the three way fight between the Master Chief, Prometheans, and the Covenant Remnant which was awesome. And the Didact intro was epic. Sadly after that level, the campaign just went downhill from there.