I think awoken are human who survived cryo sleep malfunctions that's why they have blue skin and can be found on earth especially the cosmodrome
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That would explain why [i]most[/i] of them are in the reef and some are not. Unfortunately that is not how they were born. It has something to do with them fleeing and being exposed to an excessive amount of both dark and light forces or something like that. Actually the story we play was going to be the exo story. The awoken would have had us be banished from the reef.