The Dusk Nun is not immutable. As the current world's era changes, some Dusk Nuns will also be replaced as the world changes.
This is not like the change that occurs when a world is accidentally destroyed leading to the transfer of a Dusk Nun; it is purely the change that should happen when the world's 'main character' is replaced.
Just like in Liu Hongzhao's world, if the population of that world continuously maintains normal standards and collectively shifts toward the direction of alien demons, then during the transformation process, the original Dusk Nun will gradually be replaced by a new alien demon Dusk Nun.
And at this time, other worlds are normal, so the replaced Dusk Nun will not be transferred to other worlds.
The world she was in was once very stable, but the Misty City World itself is ever-changing, and frequent phenomena will bring more changes to the world.
