The Immortal Zhang Guo Lao, the hermit alchemist. His symbol is a Yu Ku, a fish drum made of bamboo. He is the Immortal who banished Po Kong to the Netherworld. Zhang Guo Lao was an actual figure from Taoist mythology. He is said to have lived several hundred years, and that he was born toward the end of th 600s, which would put him during the Tang Dynasty. Various emperors invited him to their court, but he always refused. He could go without food for four days by only sipping wine. He is seen riding a magical white mule.