Xiao Yang discovered that the deeper he went into the cave, the more active the Fire Attribute Heavenly Energy within became.
At the same time, the surrounding temperature was slowly rising.
The cave itself slanted downward.
He estimated that he had probably descended below sea level by now.
This further confirmed his guess: the Myriad Beast Spirit Fire was indeed underground!
Moreover, this cave was most likely the passage leading to where the Myriad Beast Spirit Fire was located.
As time passed, Xiao Yang had already traveled several kilometers.
The cave twisted and turned, and he could only roughly determine his current location.
Fortunately, there was only one path in this cave so far.
Xiao Yang rested once along the way.
After walking for about half a day, Xiao Yang finally arrived in an underground space.
This underground space was enormous.
Its height alone was dozens of meters.
After leaving the cave, Xiao Yang could not see its end at a glance.
This gave him quite a headache.
Underground, it was simply difficult to determine his position.
He did not know which way he should go.
It was not completely dark underground.
There was a plant here called Fluorescent Moss, which emitted a faint glow.
Xiao Yang thought for a moment and decided to pick a direction at random first.
He planned to test which areas had more active Fire Attribute Heavenly Energy.
Then, all he had to do was head toward the direction where the Fire Attribute Energy was most active.
He first cultivated where he stood. After sensing the activity of the Fire Attribute Energy, he immediately deployed the Purple Cloud Wings and flew in one direction.
Flying Magical Beasts could not possibly live in a place like this.
On the contrary, some Magical Beasts that lived underground