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Qin Fang has already gathered two of the three materials needed for the Flowing Shadow Divine Sword, only missing the last one, Tianxin Sand.
However, the production areas for Tianxin Sand are quite rare, and Qin Fang originally didn't plan to find it, mostly just hoping to look for it in the treasure vault of a large sect.
This is also one of the reasons why Qin Fang insists on entering the Musashi Sect Treasure Vault; the Secret Realm Map is one aspect, but if Tianxin Sand is present, Qin Fang would likely take it opportunistically.
As for searching for Tianxin Sand at the original production site, Qin Fang hardly even considered it...
For example, the sand soil around the Xuan Shui Python's nest is said to produce Tianxin Sand, but the Xuan Shui Python has been extinct for hundreds of years, and even though such sand soil may exist, without the Xuan Shui Python as a reference, Qin Fang might overlook it even if he passes by.
