Some voodoo makers emphasize that poisonous insects must be gathered on May 5th of the lunar calendar (Dragon Boat Festival). This is influenced by the traditional concept that the poisonous gas is the most abundant on May 5th. "Gu, more often than the Dragon Boat Festival, are used to make medicine when the yang energy is at its peak, so it can cause illness and death." Also: "Using snakes, insects, and centipedes to control it, if it cannot be rescued, a It can kill if touched."

The legendary method of cultivating gu is similar to the one or two mentioned in "Tongzhi". Recorded in "Tongzhi". One hundred species of insects were needed, but the barbarians only wanted twelve species. Before cultivating gu, the main hall should be cleaned cleanly, the whole family, old and young, should take a bath, burn incense and light candles in front of the ancestral shrine, and pray silently to the ghosts and gods of heaven and earth. Then, dig a big pit in the center of the main hall and bury a large vat in it. The vat should be one with a large mouth and belly so that it can be easily covered. Moreover, the smaller the mouth, the less visible the situation in the vat is, and the easier it is for people to be frightened of the things in the vat, and to be in awe due to fear. The mouth of the tank must be as level as the soil. Wait until the fifth day of the fifth lunar month (Duanyang Festival), go to the field to catch any twelve kinds of reptiles and come back and ask E whether the reptiles caught on the Duanyang day can be grown into gu), put them in the tank, and then close the lid. These reptiles are usually venomous snakes, eels, centipedes, frogs, scorpions, earthworms, big green caterpillars, mantises... In short, we don't want any flying creatures, nor do we want any creatures that can run on four legs, only some poisonous reptiles. After putting these twelve kinds of reptiles into the tank, the owner and his whole family should pray once every night after going to bed and once a day before getting up. Pray continuously for a year without stopping for one day. Moreover, when you are cultivating gu and praying, you must not let outsiders know. If outsiders find out, the voodoo he has raised will be taken away by the wizard using magical methods and used by the wizard, and the owner's whole family will die. Even if it is not taken away by the wizard, it will harm the owner after becoming a Gu.

Throughout the year, the reptiles devoured each other in the tank. The more poisonous ones ate the less poisonous ones, the stronger ones ate the weaker ones, and finally only the next one took over. After this reptile ate the other eleven, he It also changes the shape and color. There are many types according to legends. There are two main types: one is called "Dragon Gu", which looks similar to a dragon and is probably transformed into long reptiles such as poisonous snakes and centipedes. One is called "Qilin Gu", which is similar in shape to &, and is probably transformed into short-bodied reptiles such as frogs and lizards.

After a year, when the poison has developed, the owner digs out the tank and hides it in a secret room with no air or light. It is said that the voodoo likes to eat lard scrambled eggs, rice, etc. After three or four years of breeding, the voodoo is about one foot long. The owner will choose an auspicious day to open the cylinder cover and let the voodoo fly out on its own. After Gu leaves home, sometimes it can turn into a ball of fire and hover in the woods in the mountains. Sometimes it can turn into a black shadow and go between houses in the village. The time when Gu's magic power is greatest is at dusk. Every time Gu comes home, he still lives in the tank. On the day it eats a human being, the owner does not need to feed it. It is said that the advantage of raising voodoo is not that the voodoo can directly steal the treasures outside like a thief and bring them back for the owner to use, but that it can borrow the aura of the voodoo to make everything the owner does smoothly. If the owner wants to do business, he can make huge profits by borrowing Chonggu's spiritual energy. If the master wants to be promoted, he can rise to the top with the help of Gu's spiritual energy. On the other hand, if by accident, the person who has been poisoned by the poison finds out and asks a specialized wizard to remove the poison, the owner of the poison will be in trouble and his whole family will die.

In addition to daily devout service, families who raise Gu must also make a grand sacrifice to the Gu on the 24th of the sixth lunar month every year. This ceremony lasts for three days, that is, the 24th, 25th, and 26th. During these three days, the host must use a fresh pig, a chicken, and a sheep every day. When the stars were in the sky, the whole family moved the pigs, goats and chickens into the secret room where they were raised, and fell down to pray. After praying, they chopped the pigs, goats and chickens into pieces and put them into the vat. It is said that Gu has a large appetite and high magic power. During the ceremony, outsiders are not allowed to participate, and information must not be leaked, otherwise their property and life will be in danger. In addition to the method of gathering insects to bite each other, various special poisonous poisons also have special manufacturing methods.