"According to legend, the origins of the Netherworld Domain are also connected to those nine enormous vortices. According to the mighty cultivator who went to investigate, the Netherworld Domain is constantly expanding under their influence. He conjectured that one day, it would completely engulf the three nearby ancient kingdoms."
At this point, Niu Ben cautiously glanced at Xu Yan. Seeing that his expression remained blank, Niu Ben's heart tightened, and he continued speaking.
"Perhaps because of those nine enormous vortices, Spirit Treasures rarely seen in the Cultivation World can sometimes be found in the Nine-Vortex Ancient Land. Some were exceedingly rare even in ancient times. Unfortunately, the Spirit Treasures that appear there are steeped in Chaotic Aura and a Special Demonic Aura, causing them to lose much of their spiritual potency. Even if cultivators obtain them, they find them difficult to use."
"The more precious a Spirit Treasure is, the more Chaotic Aura and Special Demonic Aura it contains. At first, the cultivators of the Netherworld Domain were helpless against these corrupted treasures. By chance, a mighty cultivator who practiced a Devouring Secret Art discovered that he could devour the Special Demonic Aura and Chaotic Aura within them. Although the process was extremely inefficient, it gave those cultivators hope."
"Later, after countless years of development, a new Immortal Profession System gradually emerged: Spirit Refiners. Through the Spirit-Refining Method, they can refine away the Chaotic Aura and Special Demonic Aura clinging to Spirit Treasures. However, Spirit Refining places a considerable strain on the mind, and each attempt takes a long time, delaying their own cultivation. Thus, Spirit Refiners rarely offer their services. This also gives them a highly esteemed position in the Netherworld Domain. Ordinary cultivators and factions do not dare offend them lightly."
Hearing this, Xu Yan felt a stir