Bureau of Civil Investigation's Extraordinary Records (Complete 8 Volumes).

Summary

Summary of the text: Hao Zheng Yi reveals details about a mysterious geographical map and an ancient book "Cang Tian Tu Zhi" that marks 33 Yin holes in China. He discovered a Yin hole beneath the sea near the island, which was confirmed by strange events. The narrative also explores Tan Yin Ash, a controversial witchcraft substance derived from owls, used to detect yin energy but known for dangerously stimulating spirits and causing fatal consequences for inexperienced practitioners.

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