The cave is really high and the jade is hidden in the book. It is called "Yu Qing Yin Shu" for short. The author is unknown, probably from the Eastern Jin Dynasty. It is an important classic of the early Shangqing sect. It originally had four volumes and eight chapters, but was later divided into four types. Namely: three chapters of "The True Scripture of Demon-Destroying Jade Emperor Hui Gao Xuan"; three chapters of "The Supreme Scripture of Demon-Destroying Jade Emperor God Hui Yu Qing Yin"; one chapter of "The Supreme Scripture of Demon-Destroying Cave Scenery of Jin Yuanyu Qing Yin"; one chapter of "The Supreme Scripture of Supreme Purity and Supreme Demon Destroyer Jade Emperor Shen Hui Yu Qing Yin". Original source: the first part of "Orthodox Taoist Canon".
