Descendants of Pangu in the Great Desolation

According to legend, Pangu exhausted all his mana in the creation of the world, and before his death, he hid a secret book of magic in the Three Realms.Sanqing searched hard for hundreds of millions of years but could not find this secret book, so he had to find another way to cultivate the divine body.How strong is the mana of Sanqing, why can't I find this secret book after searching for hundreds of millions of years?Could it be that this is just a legend, didn't Pangu leave any secrets before his death?

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