It was common knowledge that the Spirit Fiend Abyss was the inner side of the world, while the mortal world was its outer side. The two had never intersected, like the front and back of a mirror.
Yet the entrances to the Spirit Fiend Abyss had begun appearing in this world long, long ago, opening passages between the mortal world and the Spirit Fiend Abyss and causing the two to intersect.
Because of this, the Phantom Demons of the Spirit Fiend Abyss began invading the mortal world in force, treating humanity as food.
By now, entrances of various sizes had appeared throughout the world, and countless Phantom Demons ran rampant. Humanity could only establish cities within defensible territories and cling to its own little patch of land to survive. Outside the Base Cities, the world had become a wasteland danger zone—a paradise for Phantom Demons.
It was worth noting that the size and scale of an entrance to the Spirit Fiend Abyss also determined the level and number of Phantom Demons that could pass through it and arrive in the mortal world.
If an entrance was too small, powerful Phantom Demons could not pass through. Their overwhelming power would distort the entrance, preventing them from completing their manifestation in the mortal world. If too many Phantom Demons tried to pass through, they would likewise cause a qualitative change, making it impossible for them to successfully pass through the entrance and manifest.
The entrance to the Spirit Fiend Abyss that had appeared in Longyao City and caused the Huaming Campaign had been medium-to-small in scale. At most, it could allow Hazard Breeds among the Greater Phantasmal Demons to manifest. Nightmare Breeds could not pass through it—their power was too great for an entrance of that scale, making it impossible for a