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Why did the Seven Star Formation need Four Distinguishing Skeleton of Yin and Yang to be its banner?
This has to do with the Underworld Warfare of the Dao. Back when Zhang Tianrann dealt with Tong Duan in the ancient path of the Three Gorges, although he was a Underworld Warfare, Zhang Tianrann did not set up a formation. It was just that at the top of the river, Yuwen Fachen made a hub
