This aura… It was a Phantom Beast!
It was a type of evil Demonic Beast that fed on souls, a creature that everyone had a duty to slay. This was not something that should have appeared on Earth; it was exceedingly rare even in the Immortal Domain.
Phantom Beasts possessed high intelligence and were especially skilled at creating illusions. Their power was terrifying. Even a juvenile could render a Golden Core Stage Cultivator unconscious, causing them to lose their sense of self as their Three Souls and Six Spirits were gradually devoured.
If one died a normal death, any living being had a chance to be reincarnated. But to be devoured by a Phantom Beast… was to be utterly reduced to ash. Thus, in the Immortal Domain, Phantom Beasts were universally despised, hunted down by all.
The one that had suddenly appeared on Earth was clearly a mature adult; even a Venerable in the Venerable Realm could fall victim if they weren't careful.