[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.