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] grey101 [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.[/quote] I'm pretty sure that was just a postmortem monologue.