To refine the nine-child mother heavenly demon, one first had to find suitable souls.
The most basic method was to find nine women pregnant for the first time, ascertain the Eight Characters of each mother's birth and the Eight Characters at the moment each child was conceived, and ensure that all the fetuses were boys.
Demons refined this way were the purest, but also the weakest and slowest to develop. They needed hundreds or thousands of years of nurturing before they could become true great demons.
Truly formidable experts first chose powerful souls, such as a cultivator's primordial spirit or a god-demon someone else had already refined. Above all, they needed profound magical power—the fiercer, the better. Nothing else mattered.
After capturing a primordial spirit and refining it, they sent it to reincarnate. They could give it whatever Eight Characters they wanted and make the woman conceive whenever they wished.
Shi Feiyang had many cultivators' primordial spirits in his possession, most of which he had refined into demons.
After sorting through his demons, he finally decided to use Cold Xian to refine the mother demons.
Cold Xian happened to have nine primordial spirits. This Monster was genuinely formidable: an ordinary cultivator who could refine a second incarnation already ranked among sect leaders, yet she had refined eight over ten thousand years. In part, this was due to her extraordinary innate gifts; she had possessed nine bodies to begin with, after all, and later smoothly cultivated nine incarnations. Shi Feiyang had already destroyed all her incarnations, however, leaving only her nine primordial spirits.
Shi Feiyang released her. Dressed in green gauze and barely an inch tall, the Monster stood in his palm and looked up at him, apprehension stirring in her heart. "M-Master?"
"Mm, very good." Shi Feiyang gently touched Cold