567 The Transit Windows 4yr

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The size and depth of the cave were way beyond their expectations.
There was no sign of the cave's terminus after 10 minutes of walking. Anxious, everyone was being exceptionally vigilant.
Suddenly, Chen Mu's footsteps came to a halt. Besides him, almost all of the level seven card artisans stopped in their tracks synchronously, looking astonished with a tinge of joy.
There were waves of energy fluctuation! With no exception, all of them felt a distinctive waves of energy fluctuation!
Nobody had ever witnessed a transit window. However, all the narrations regarding the transit windows shared a similar fact, that the transit windows were able to emit waves of energy fluctuations. Despite the fair strength of the waves of energy fluctuations, it was constantly radiating as long as the transit window existed. 
This was a rather strange wave of energy fluctuation, different from any other they had experienced before. Despite the fever amid the group, they were acting extra cautious. I