There are explanations in the Book of Changes.
Carved dragons on the bracelet are easy to get dark when encountering dark clouds. The bracelet avoids black gas and counts black dragons to ward off evil spirits. If you are sleeping, the house you live in is worse than the house where the nigger lives. If you are in your hometown, you should move immediately to avoid the black dragon.
This is what I heard from the old man, which means you should move.
Besides, there may be dead people or ghosts in your family. If this ghost wants to go home, it will turn into a black dragon and give you a dream. You'd better act quickly, otherwise, something may happen in a long time.