Not long after they encountered the monsters who had come looking for them, Lin Yuer, Wang Xiaohu, Ding Xianglan, and Ding Xiulan finally learned the true origins of the Demon-Locking Tower from the monster known as the Immortal in the Book:
It turned out that the Demon-Locking Tower had been completed 584 years ago by Emperor Wu of Liang of the Southern Dynasty. He had gathered rare white jade and diamond stone from across the land, summoned thousands of master craftsmen, and spent more than twenty years on its construction. He had also invited countless eminent monks and mages to place innumerable forbidden talismans inside and outside the tower, hoping to use it as a mighty weapon against the many cultivators on Mount Shu.
However, the cultivators of the mountain had fought back with all their might. After a great battle, Emperor Wu's forces had been soundly defeated and forced to retreat. The Buddhist pagoda he had built was left behind, and was later taken over by the newly established Mount Shu Sword Immortal Sect. They renamed it the Demon-Locking Tower and used it to imprison monsters.
What the Prison-Demon King, still bound to the sword pillar, had said earlier was also true. In theory, the Demon-Locking Tower had an entrance but no exit, because it had originally been built as a magical treasure to trap people and kill cultivators. Its makers had never planned to include an exit.
The materials used to build the Demon-Locking Tower were extraordinary, and the countless forbidden talismans inside and outside it added to its strength. As a result, the walls of the tower were even sturdier than solid bronze or iron. No divine weapon, lightning strike, or fire could damage them in the slightest, and immortal arts and demonic spells were just as