Sentient Trees?
Over the next two days, Xuan Hao managed to fully recover from his fight with Aria, the guardian of the first celestial gate. At the same time, he also realized that the formation had begun to reproduce the mist from his fight with Aria. The only difference this time around was that the density of the mist increased at a much slower pace compared to how fast it had happened during his fight. Even if after two days, he could still resist the mist with his physical body alone and it would most likely still be another five days before he would be forced to leave the plaza.
Although it seemed like the trial was not forcing him to leave immediately, there was still a time limit for how long he could spend inside. Unless he had enough strength to resist the power of the mist when it reached its full strength.