Xi Mountain was a land thick with Yin Sha Qi, where the remains of countless strong beings had been buried over thousands of years.
Now, the Nine Emperors' Avatars, hidden within the black mist, were frantically absorbing this Yin Sha Qi.
Infinite amounts of Yin Sha Qi converged, forming an enormous vortex above Xi Mountain, from which a terrifying suction force emerged, channeling all the Yin Sha Qi directly into the bodies of the Nine Emperors' Avatars.
The Nine Emperors' Avatars were essentially a Demon Dao sacrificial refining technique, rejected by the Righteous Path, as the avatars refined were often imbued with evil attributes.
According to rumors, the method of refining avatars in the Demon Dao could easily lead to the avatars controlling the original being, making the original being a slave to the avatar.
And ultimately turning into an Evil Demon.
This was also why the process of refining avatars in Demon Dao was not accepted by the Righteous Path.