Well so far (im in chapter 3) Glassman managed to do something with the Didact's gift (we dont kow what yet, thorne is missing and halsey is back in the brig, also she was talking with Jul Mdama aparently, who was using her for something.
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The composer is forerunner tech people. Slipspace is there world, The composed humans are likely sent to some sort of buffer system and stored for use as Prometheans.