It’s possible that the contact with the Giant Kings predates the cataclysm that sank Atlantis and ended the Thurian Age. Perhaps the Grey Ones civilization was alive and active back then, before humans got around to making a mess out of the Giant Kings’ playground.
Both Black and Grey Ones may have been human once, a very long time ago. Contact with creatures of the Outer Dark or other supernatural entities could’ve twisted them into the bestial creatures they are now, while at the same time providing them with the knowledge to turn living things into little statues.
Who knows what the actual purpose of the statue-turning magic was. Maybe it was intended as a prison. Maybe it was intended to preserve certain individuals until a later date. But without their masters, the degenerate 50-shades-of-grey dudes just kept on tossing folks they could find into the pools, as instructed, without any real purpose.
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