After Lin Xuan stepped inside, he found it wasn't much different from the outside, except the heat was far more intense. Bingxin had already told him before he came that a different trial lay behind each door. She wasn't sure what kind of trials they would be, only that the difficulty was determined by one's Cultivation.
In other words, the lower one's Cultivation, the lower the difficulty; the higher one's Cultivation, the higher the difficulty! For the Phoenix Race, one of the foremost Divine Beasts, to possess such miraculous creations was perfectly normal.
Once he was inside, the clamor from the outside world vanished completely. However, as his group entered, the Fire Phoenix King's party went in as well. Since they were all members of the Phoenix Race, they could enter with ease, and the same was true for the Mutated Phoenixes on Lin Xuan's side.
