The Legend of Situ Shankong.

Summary

A supernatural encounter in an underground tunnel leads to tracking an injured Song Zi. Using a divination technique with an Eight Trigrams pendant, the narrator follows blood trails through drainage tunnels. They discover Song Zi critically wounded at a well cover's buffer zone, having drawn a protective Five Mountains True Form blood diagram around himself. Despite creating a defensive magical circle, Song Zi appears unconscious and severely injured, with blue-tinged fingernails and a body covered in blood and soil, suggesting a life-threatening situation.

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