This place was already at a high altitude, and climbing the mountain was even higher. Zhao Changhe often heard about altitude sickness in the modern world; it was said that those who did not acclimate could turn pale with labored breathing, and in severe cases, it could lead to accidents.
As a result, when he tried it himself, he felt... nothing.
The air became thinner, which might actually be even more uncomfortable for martial artists than for ordinary people, because it involved energy circulation and the flow of blood and Qi. Martial artists required a greater intake of external energy than normal people, and such an environment further limited their abilities.
But for the couple who had opened the door to the Secret Treasure, with their internal circulation system, this was not an issue.
Forget the thin air; even if they were to dive into deep water now, the time they could hold their breath would astonish onlookers.
