The absorbed, refined Soul Power energy rapidly circulated through the Eight Extraordinary Meridians, continuously gathering within Zheng Yi's hidden acupoints.
Bolstered by the essence of Soul Power, the spiritual energy formed by the Black Fiend Technique rapidly grew stronger.
Perhaps it was an illusion, but at that moment, the Azure Nether Flame gathered around his body seemed to deepen in color as well. It flickered with a faint, ghostly glow and gradually took on threads of peculiar corrosive aura.
Having finally found such a holy ground for cultivating the Black Fiend Technique, Zheng Yi naturally could not bear to leave lightly. He stopped wandering about in search of other locations and simply remained in this gloomy, terrifying mountain hollow to begin his secluded cultivation.
Relying on the Blood-Clothed Female Ghost and the Yin Soldiers and Ghost Generals under her command to venture deep into this Ghost Cave, he captured Vengeful Spirits and Malevolent Ghosts for cultivation.
This continued for a full half month. To avoid delaying his usual cultivation, Zheng Yi's greatest daily expense was Spirit Stones.
There were no spirit veins in the Apocalyptic World, and spiritual energy was exceedingly sparse. Even when gathered and drawn in with spells, it came only in wisps and threads, incredibly rare.
This place truly was unsuitable for cultivators. Fortunately, Zheng Yi had brought a large number of Low-Grade Spirit Stones to meet his daily cultivation needs.
Yet the results were exceptionally abundant. During this time, he refined over three hundred and thirty Vengeful Spirits and Malevolent Ghosts. About one-third of the Azure Profound Fiend circulating within his body had naturally transformed into Ink Spirit Fiend.
Even the Demonic Flame condensed from his dense Killing Intent had become a cyan-black Demonic Flame, its power greatly increased.
Its corrosive power could even act directly