It is said that in order to subdue the demons and ghosts of Qingcheng Mountain, after chanting spells and symbols, Master Zhang threw a Zhu pen, and the handwriting split the mountain into a groove. People call it "pen throwing groove".
Legend has it that Zhang Tianshi is a monster who subdues Qingcheng Mountain. After chanting spells and scribbles, the brush pen is thrown, and the handwriting is split into grooves. People call it the "pen throwing groove".