The reason why Xuan Hao was shocked when he saw where the old man was heading was not due to the fact that he had found some kind of hidden passage that led to some kind of underground space similar to the one located beneath the ruins of the Raging Flame Sect, but instead because the old man went to a rather familiar place.
To be more specific, he descended headfirst into the strange dark red whirlpool hidden away inside a ravine of the Burning Mountain Range. Using yet another strange artifact to protect himself from the flames and powerful spatial distortion around the dark red whirlpool. After all, even though he was at the Peak of the Domain Lord Realm, he was still far too weak to deal with something capable of shattering space.
Whoosh~
