So the giant Mecha Ball is the new Gravemind?

I wonder if that giant alien ball is ship or a massive armored boss that we get to fight with in the hinted vehicle that makes the cyclops a runt.

Cortanna refers to it as Him. So do you think it’s the main antagonist of Halo 4 or what he drives around in?

Its a cryptum,where the didact was placed when he died,but it also reminds me of the thing the primoridal floated around on.and at the end the didact symbol gets flipped.So it looks like,343 is comming back for the librarian and the didact is being controlled by the primordial or a precursor(Lol legendary ending?)

you see this is why I gotta go out read these books. Right over my head, but thank you now I got some book hunting to do.