The air quality in the Core Area was initially very good, and Yan Fei could breathe freely using his mouth. However, upon entering the Cultivation Chamber Space, he found it filled with viruses and bacteria produced by the decomposition of human bones, complemented by residual cultivation fluid providing the energy needed for their growth. Over the years, they've evolved unique traits and become highly toxic.
Realizing that he couldn't breathe the air directly here, Yan Fei once again donned his Battle Armor helmet, activating the internal circulation system to avoid inhaling toxic viruses and bacteria that could damage his body.
