Petra is one of the three Traladran Immortals. According to the Song of Halav she was a maker of pottery. When the Immortals visited Halav, they also taught Petra how to make and use bows, the art of medicine, how to spin and weave, and the secrets of the potter’s wheel. some sources claim she was the wife of the king of Lavv, slain by Halav for failing to heed the Immortal’s warning.
After the death of Halav, Petra and Zirchev took his body back to Lavv, but during the funeral feasting, when the body was on the pyre, the Immortal’s spirited Petra, Zirchev and the body of Halav away.
Petra’s symbol is a potter’s wheel viewed from above (a circle with a smaller circle in the centre), though some claim it is a shield.