All the high-ranking members of the eleven civilizations were relocated to the Moon.
This was not a purge but a precaution to prevent possible unpleasant incidents between the two parties.
Even with the constraints and guarantees of the Oathbook, you could never be too certain about the unpredictability of human nature.
The more they understood the Silver Species, the more they realized it was a deformed and pathological racial model. Its essence was the self-cannibalization within the race triggered by the Sterilization Curse, turning the entire civilization into an extreme social Darwinist jungle. As if escaping the curse's despair by outrunning one's fellows rather than the tiger, it wasn't to say, however, that all the fellows had died out.
