After Teal'c defected to Earth, Rya'c and his mother were forced to live as pariahs. At 12, Drey'auc begged the priests to give her son a Prim'ta, but Teal'c interrupted the ceremony, since he didn't want his son to have a symbiote. Without a Goa'uld to provide an immune system, Rya'c developed scarlet fever, until finally Teal'c gave him his own symbiote to save him. He remained on Chulak, under the care of Bra'tac. (SG1: "Bloodlines")