This formation should be done every 10 years. If it is done more frequently, the person's thinking power will mutate and turn into a different person. A person who cannot control himself can never progress in his dao. So as long as it was done every 10 years, it had no negative effect on the dao enlightenment. It was also mentioned in the book that the other twenty books contain information for use in the formation.
Viny looked at the other books and studied them one by one. The two books were empty inside, and the other eighteen books contained lengthy information written in an incomprehensible language. But each piece of information in eighteen books was about one person. Viny did not yet understand how the souls of persons were confined to a book and in crystals associated with it. But Viny thought it was some kind of formation of soul-binding magic.
