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Gryz and his little sister, Pana, lived in the Motavian village of Molcum. When the village was razed by Zio, they were the only survivors. The pair fled to the other Motavian village, Tonoe, where they stayed with Dorin, a close friend of their father. Gryz, however, was filled with anger and swore revenge on Zio.
When Alys Brangwin and friends came to Tonoe looking for Alshline, Gryz agreed to lead them to it at Dorin's request. He accompanied to group until defeated Zio. At that time, he returned to Tonoe to care for his little sister.