That would be epic. It always got a bit boring after making your own stage in the original forge for ages building all of this stuff and then theres no one to fight. Sure I could go online but its not the same as fighting Covenant or even UNSC AIs. It could be an awesome skirmish just for fun.
The most beautiful thing would be being able to change alliance roles, or set custom ones to reenact previous battles in the Covenant's history. Grunt rebellion, Taming of the Hunters, and bears, oh my.
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