Halo amateur here. But in the first scene with the Didact what is he talking about?
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How he won't let humanity ascent to taking the Mantle of Responsibility (Forerunner/Precursor term for the responsibility of caretaking the galaxy) as they were rightfully supposed to. How his wife, The Librarian, imprisoned him on his own world (Requiem- referring to how Didact created the shield world strategy instead as an alternate to the Halos).