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From this Jin Dafu's mouth, Li Yi didn't get any useful information. Although people in this world are aware of the existence of ghosts and spirits, it's all superficial knowledge; they are aware of some taboos, but in their ordinary lives, it seems there is no involvement with ghosts and spirits.
Of course, there is also a possibility that matters related to ghosts and spirits have nothing to do with most ordinary people, as well as common martial artists. Perhaps only the warriors in the Upper Three Realms, or the top powers of this world, would have some understanding.
After all, Li Yi had heard from Fan Zhizhou, the City Lord of Sanyang City, that only a martial artist who has reached the Refining God level is qualified to be transformed into a ghost soldier or a Yin General.
A martial artist at the Refining God Realm is already a very top-notch strong person. There probably aren't many throughout the Four Seas and Eight Continents.