Many people say that the soul of the person who dies under the red shirt will become a spectre and take revenge on the enemy. So people usually say that the ghost in red is the most terrible. In fact, there is another kind of ghost that is more terrible than the ghost in red. This is a dementor. According to legend, if a person can't report a case because of a deep hatred, he can lie in the coffin and lie at the bottom of the corpse for 7749 days without eating or drinking, becoming a ghost and calling it a ghost. Pig-spotted ghosts are also called green blood ghosts, because their blood is retrograde at the moment of death, and their blood will turn green after 49 days of death. Dementors' bodies are dead but not stiff! If you have the ability, you can be reborn and become a demon corpse. In addition, taking ghosts in Cantonese means that there is no sound in front of you like a ghost.
2 Name source
Why is it called a green ghost and not something else? This is because it practices by absorbing corpse gas. It was originally called a corpse ghost, but it has been circulated for thousands of years and has become a dementor. Because dementors are formed with hatred and are more powerful than ordinary ghosts, many instruments have failed. Moreover, dementors generally don't die, unless they are killed by Master Gao Ai and others or stabbed to death by pure yang, they are almost immortal. Even if they get revenge, they won't disappear because of their wishes.