In my opinion, in the small-scale peasant society with very low productivity at that time, everyone could not give a scientific explanation for some strange things, which could only be attributed to the existence of God. In fact, according to the present materialism, how can there be a soul after death? So evocation doesn't really exist, it's just a lie made up by people at that time to give themselves a happier explanation.
At that time, it was actually a Qing Dynasty stonemason named Wu Dongming. When he is repairing the water gate, he needs to nail the root pile into the river bed. At this time, a man named Mu wrapped his enemy's eight characters in paper and nailed them to a stake. The purpose is to make his enemies never turn over. Later, many people asked Wu Dongming to put his enemy's birthday on a stake in order to curse his enemy.
It's common for harem princesses to stick the generated eight characters on dolls in Qing Palace dramas, and then acupuncture the dolls to curse the concubines who are pregnant with children. It is said that Kangxi's eldest son used this string to curse the prince. Later, this incident aroused widespread concern throughout the country, and even more cases of evocation broke out all over the country, which attracted the attention of the emperor. Evocation has affected the normal life of the people and the interests of the whole royal family, so Kangxi personally ordered the necromancer to be executed.