I just don't understand why the Librarian indexed all other life but her own race. Is there a certain reason why she didn't? Can someone enlighten me?
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Because the Forerunners didn't die. The Bornstellar-Didact led the survivors on their "final Great Journey" to find the Precursors.
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Forerunners had failed to uphold the Mantle. They had also chosen the next caretakers: Humanity. In fact, it was the Forerunners who gave themselves the name Forerunner. They always considered that greater things would happen after them.
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Maybe she forgot.
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I'm sure we'll find out for sure in the final book of that trilogy coming out in a few months. My best guess is that she wanted the mantle to pass to humans so the forerunners had to make way for that.
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Maybe she did, but they were meant to populate an entirely different galaxy in exile.
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Space Magic.