To be honest, Fang Ze really didn't know this. But since Hei Po had asked, Fang Ze, with a quick turn of his mind, had an answer. He looked at Hei Po in astonishment, "Research on the method to imprison demigods?"
Hei Po nodded vigorously, her aged face full of reverence and longing, "Back then, in order to permanently resolve the issue of extraterritorial demigods and protect the human race, our ancestors have been researching the method to imprison demigods ever since the Great Cataclysm. He also faced the predicament of not having demigods to experiment on."
"But he didn't give up. He discovered that the divine souls of human demigods and extraterritorial demigods actually have similarities in structure and rank."
"So... he actually tore apart his own divine soul to use as an experimental tool."
"Enduring the pain of soul-tearing and destruction, he gradually perfected this method and named it the 'God-Imprisoning Method!'"