It is reported that anyone who has something to do with Lu Ban's book will eventually be related to words like Dugu, which means that after learning the content of this book, people around him will be implicated if they are not alone. It is for this strange reason that Lu Ban's book is also called "a door is missing", with a very clear meaning.
Unofficial history recorded that the first part of Lu Ban Shu mainly recorded some carpenters' skills, and the second part recorded medical skills and spells. Lu Ban knows that all carpenters live by coolies and have no power. In order to avoid being bullied by others, he had no position, so he left some spells for future generations.
There is also a folk legend that carpenters and plasterers should not be offended. If they are offended when building a house, they will curse the family behind their backs with some dark magic we don't know about. There are many metaphysical techniques in Lu Ban's books, some are beneficial to building houses, some are harmful, and there are also many handwritten versions among the people, most of which are sinister. The level of this kind of mysticism is relatively low, and most people can learn it, and the effect is quick.
Learning Luban is basically passed down by the master, and most of them choose a relatively secret place when learning from the master. People who learn this kind of occultism are generally miserable. Basically, they are all alone, with no offspring and living alone. But these are all folklore, and there is no evidence to prove it. Many people are worried about what will happen after reading Lu Ban's book, but since Lu Ban's book became famous, there have been many fake manuscripts on the market, so what you see may not be true.