In the past, there had been many cases of apostles sacrificing their flesh and soul to summon the serpentine devil on planet Xavier and planet Earth. The magician community had suffered minor but also significant losses each time that happened.
One time, a king-ranked serpentine devil offered up his vessel to the serpentine devil. The body of said magician was strong enough to endure more than half of its power. As a result, many cities got destroyed, and millions of people lost their lives, their flesh, and their soul devoured by the serpentine devil. The magician community tried to stop it, and every family sent their experts to defeat the evil god's vessel at that time.
Thousands of experts cornered it. However, they all died, unable to even leave a scratch on its body.