It costed Chief Cortana to stop the Didact temporarily, his best and possibly only friend gone to delay him. I feel like in the end Chief will give his life to defeat him.
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[quote][b]Posted by:[/b] CBWade16 Pretty sure the didact is dead.[/quote] I am pretty sure he is talking at the end of the Game. I think that Bornstellar had his portion of mind composed leaving the didact to his body. That would be the best way to explain one being on the ring and the beginning of cryptum.