The formation of the Southwestern Ancient City was actually directly connected to Ancient Demon Mountain. In ancient times, before the Southwestern Ancient City existed, Ancient Demon Mountain had already been there. Even then, it had been a treasure land teeming with Demon Beasts and Heavenly Materials and Earthly Treasures, and its territory had been much larger than it was now.
Later, some ancient cultivators discovered Ancient Demon Mountain. But its High-Rank Demon Beasts far outnumbered those cultivators, so they could only sneak around the outskirts of Ancient Demon Mountain, hunting lone Demon Beasts and stealing Heavenly Materials and Earthly Treasures.
Somehow, one of the cultivators who discovered Ancient Demon Mountain leaked the news, and word spread throughout the Cultivation World. More and more cultivators came to the mountain. Gradually, the Demon Beasts were hunted down until fewer and fewer remained, and their territory was squeezed ever smaller.
At last, this enraged the transformed Demon Beasts in the heart of Ancient Demon Mountain. They joined forces and struck with the speed of thunder before anyone could cover their ears, slaughtering the cultivators so thoroughly that not even a chicken or dog survived. Only a handful of cultivators escaped. The entire Cultivation World was shaken-Ancient Demon Mountain actually held so many Transformation Stage Demon Beasts!
The Great Cultivators of the various sects then joined forces and spent several years making careful preparations before launching a massive assault on Ancient Demon Mountain. Although the mountain held many transformed Demon Beasts, cultivators in the Primordial Era had abundant Heavenly Materials and Earthly Treasures, and there were far more Great Cultivators than there are now. After a fierce battle, the Demon Beasts suffered devastating casualties. Just as the cultivator army believed victory was within its grasp, the king of Ancient Demon Mountain appeared. It was