The status of powerful martial artists in the Silver Dimension. Guan Yu and Zhang Fei once stated that when a person reaches this level, he/she will be able to not eat at all. Only a man named Zhang Jiao has been able to reach the utmost of this limit.
Trivia[]
The word "Pi Gu" has the same pronunciation of "bum" in Chinese (屁股 / Pì gu).