Yang Xiaotian was surprised because the Octagon Continent was one of the many continents under the control of the Invincible Sect.
The Invincible Sect had operated in the Chaos Domain for many years and controlled over a hundred continents within it.
The Octagon Continent was just one of these hundred-plus continents.
Afterward, Yang Xiaotian further inquired the Blood Dragon Ancestor about where the Primordial Dragon Egg was found on the Octagon Continent.
The Blood Dragon Ancestor finally confessed that it was located within a dragon cave on the eastern mountain range of the Octagon Continent.
This dragon cave, ensnared with heavy restrictions, had many places even he couldn't enter, so he didn't know whether it contained the Primordial Heavenly Dragon Art or not.
A dragon cave?
Yang Xiaotian muttered to himself.
This dragon cave must have been a temporary cultivation site for the Primordial Dragon Ancestor back in the day.