Most of the demons currently existing in the Abyss originate from the dissolution of the first-generation Demon Gods, with a few stemming from successors who rose later, and among them, the Snake Demon belongs to the latter.
Although it is unknown which Deity's shattered Origin initially birthed the Snake Demon, or whether it is directly related to Yemenggade, the Serpent of the Garden from the Nine Realms.
Nevertheless, this type of demon is indeed well-suited to the environment of Tartarus, taking root everywhere in the chaotic Abyss, much like the Flame Demons.
Thus, using the form of an Eight-Armed Snake Demon, which possesses a high-ranking bloodline among the Snake Demons, a temporary separate entity was created, allowing the Great Serpent to temporarily avoid the rejection of the Abyss Will.