Gu An watched the skull move forward, and because the distance was too far, he could not use Life Span Detection. He could only follow with his Divine Sense.
The two Free Immortals were still in fierce battle and had not noticed the greater danger approaching.
Gu An could feel that the skull had not reached the Daoist Zang Zizai Immortal Realm, but it was more dangerous than a Free Immortal. He did not know what Divine Power it was using that made it undetectable to the Free Immortals.
Time continued to pass.
An hour later, while the two Free Immortals were in a standoff using their mana, the skull suddenly appeared, became incredibly huge, and swallowed both Free Immortals in one bite, then turned into a rainbow light and disappeared into the dark depths.
The cosmic void then fell silent.
The great battle seemed as if it had never happened. Although Gu An was surprised, he had no intention of tracking the skull.