The Xisu are an extinct tribe or species from planet Moldar. They lived in the rainforests and built large stone temples to a forgotten deity, temples of such fine workmanship that many remain standing today. Other architectural marvels include elevators; rising stone platforms in some cases, and in others, devices to generate bubbles that support a humanoid's weight for several seconds. Machines of unknown function continue to dot the planetscape not only in the rainforest but also the polar regions.

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