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Rykros is the fourth and final planet in the Algo Star System. Unlike the other three planets, Rykros travels on a highly elliptical orbit. It approaches the rest of the system in thousand year intervals that coincide with the rising of Dark Force. It was also invisible until AW 2284, hidden behind a cloaking field that can only be dispersed with the Aero-Prism.
The surface of Rykros is covered in various crystalline formations. The planet is uninhabited, save for spiritual beings who exist to train the guardians of Algo.