There is such an urban legend in the game Yggdrasill.
It is said that when you start the game late at night, and the game time is also late at night, a player without an ID may appear around you. Who it is no one knows. But once he appears around you, you will have all kinds of problems as if you were cursed...
This is one version of this urban legend. Even veteran Yggdrasill players can't tell which one is the first edition. All I know is that it's getting more and more outrageous as it spreads. Including but not limited to you will be offline suddenly, your health bar and mp will not be viewable, a large number of difficult monsters will be refreshed, etc.
There are many opinions about its origin. Some say it's purely a coding error. Some say he is an official prankster. Some say he is a hacker virus. Some people say that he is a spirit in the game. The most powerful thing is that some people say that he is a player who died in the game. The soul is wandering and has no peace. Even the most outrageous claims about high-dimensional creatures
Intent: Fan OC text