Spirit Pressure Allergy

The students were seated on the square, trying to sense the spirit qi fluctuations in the Darkness Continent. 

In Middle-Earth, the spirit qi in the atmosphere was like a pool of dead water, with almost no ripples. However, things were different in the Darkness Continent. The spirit qi was constantly flowing. Even if the ripples were very small, the spirit pressure would continue to fluctuate.

Many cultivators who came here for the first time were unaccustomed to such changes.

It was like taking vehicles. The Middle-Earth Nine Provinces were like high-speed rail and were more stable, while the Darkness Continent was like a mobile car traveling on uneven land and was shaking non-stop.

Such fluctuations affected the body. Although one might not be able to notice it in the beginning, if this were to continue for a while, there'd be qualitative changes.