When Han Xuhan and Mu Ran had entered the hidden world fragment for the first time, the sunshine had told them that noontime was about to peak. Since then, more than eight hours have passed.
Within the deeper layers of the foggy region, it was impossible to tell whether the sun was still up or not. The darkness that gradually enveloped their surroundings with the progress of their exploration didn't seem to be a mere product of the night.
The fog was becoming thicker, and harder to navigate through. The noise and aura of chaotic battles were coming from every direction. The reason wasn't hard to guess.
On one hand, the frequency of encountering zombies had increased, the type that had been soaking in the poisonous fog for a long time. Their mutations were more extreme, their strength was higher, and their monstrous desperation for prey was only getting worse every second.