To create such a dead realm, the person who opens it up must brand the living creatures with a specific mark that belongs exclusively to them.
As long as a living creature carries this mark, then unless the mark is erased by someone, this creature and all its descendants will enter the corresponding dead realm upon death.
"If I can somehow manage to survive this, then when I return to the Shanhai Domain, I can try to open up a dead realm of my own!"
Chapter 1167