The gases churned, appearing like some kind of deadly poison; an ordinary Martial Artist would likely perish instantly if they inhaled even a single breath.
However, when Fang Hong's gaze fell upon those green gases, a joyful expression immediately appeared on his previously calm face.
These green gases were all True Dragon Qi.
It seemed his earlier conjecture was indeed correct; Yin'an Mountain must be intricately linked to a Dragon Clan secret Treasure, otherwise, it would be impossible for such dense True Dragon Qi to be nurtured here.
Fang Hong immediately concentrated his Divine Sense, piercing through layers of True Dragon Qi, carefully exploring the entire Yin'an Mountain, attempting to find the secret Treasure capable of emitting such astonishing Dragon Qi.
"Th-this is-"
After a moment of Divine Sense exploration, Fang Hong's expression subtly changed, his body trembled slightly, and his face showed deep shock.
This Yin'an Mountain was not a mountain at all.
