I seriously believe the enemy is mainly going to be ONI aka Office on Naval Intelligence.Because they are known to set up at installations like these and known to sacrifice UNSC personnel.Think about it.It definitely shows in the books,games,and minifilms from waypoint.
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[quote][b]Posted by:[/b] MWLB4244 I am excited to fight the Promethians. I think they will be an interesting new enemy. Also I am excited to learn who is leading this raiding group of Covenant. Plus, the sphere looks like an intriguing enemy/ally. It will be interesting to learn its story.[/quote] The sphere is called a cryptum. It is usually inhabited by a high ranking forerunner for protection example, the Didact.