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The Flying Polyps are a species of 'half-polypous entities' that ruled the Earth before the arrival of the Yithians around a billion years ago. The Flying Polyps built black basalt structures in which they lived. They fought a war with the newly arrived Yithians and were defeated and forced into subterranean caverns and tunnels, but would eventually re-emerge and destroy the Yithian civilization in that era.
Flying Polyps were only partially material, and thus difficult to harm, but the Yithians found that electrical weapons were effective against them. They could generate powerful winds. Their presence was marked by five-toed footprints.