The Dongxuan Immortal had the gall to shamelessly talk about how difficult her life had been, hoping to recover the three Snake God incarnations from Shi Feiyang.
Her five Snake God incarnations were different from those of the Mysterious Sect, which housed their Second Primordial Spirit, and even different from the Evil Demon Cultivators who practiced with the Three Corpses Primordial Spirit. Those were divisions of their own Primordial Spirits, condensed from Essence Energy, and usually housed within lifeless objects like Treasure Beads.
Her five were created using Substitute Gu as a medium to bridge her Primordial Spirit with those of the five Snake Demons, and then she suppressed and controlled them with her powerful spiritual power.
The advantage of this method was speed. In a very short time, she had subdued the five Snake Demons, each with over three thousand years of Dao Level, and refined them into her own External Bodies.