Astraia is a hyperintelligent hIE working for the international council as a security consultant specifically focused on hIE-related threats. She's essentially the expert they call in when things get complicated. Throughout the series, she provides crucial context on how the conflict between humans and hIEs actually started and what the world looked like after everything settled down. Interestingly, she seems to support what Lacia is trying to do, which says something about where her priorities lie.
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