After going in and out many times, die Xiaodie had a slight understanding.
The black fog space was also known as the realm of nightmare.
This was a place where the laws were lacking, and its unique characteristic was that any elf or human who stepped into the area would definitely have nightmares!
Some elves had strong mental resistance and could last for a long time.
Some of the elves had weak mental resistance and fainted on the spot.
"However, the fear that the realm of nightmare instigates will only increase with time. The longer you stay, the deeper the fear, and the deeper you go into the black fog, the faster the speed of the fear's growth. No matter how powerful an elf is, there will always be a limit in the realm of nightmare."
Even though legendary - Level elves could not enter.
