The fairy family itself can't communicate with people, and the reason for looking for an apprentice is to talk and do things with the help of the body. So the apprentice is also called a psychic.
As for painting symbols, some are handed down by immortals, and more are learned by themselves. But if you learn to draw by yourself, you don't need others to be effective, because you have to give it in the hall after painting, so when you use it, you have the aura of Xianjia and Xianjia doing things, and so on.
I am a disciple myself.