In the boundless Primordial World.
Succubi are a rather unique species, living in an underground cavern world called the "Flame Prison."
No one knows exactly how extensive the Flame Prison is or how many caverns there are.
Nor does anyone know just how deep the Flame Prison goes.
Yang Fan has glimpsed it several times in his dreamscape.
He saw a series of underground caverns, some only a few hundred meters, while others exceeded a thousand kilometers in length.
Many species live in the Flame Prison, collectively known as Hell Demons.
In terms of malevolence, Hell Demons are no less dangerous than Demons.
The difference is that most Hell Demons are not well-adapted to the outside world, so they usually stay in the Flame Prison, while Demons roam outside, causing havoc in countless places.
No one knows how many types of Hell Demons reside in the Flame Prison.
Hell Demons particularly enjoy breeding recklessly, producing countless strange and peculiar new species each year.
