Although the immortal astral body didn't have the ability to directly influence the battle situation, it allowed Xu Nan's physique to improve by a large margin. It also allowed him to establish a direct connection with the 'Qi' that was wandering in the universe.
Before this, he only had the Lotus true Qi left behind by ah 'kun.
After obtaining the immortal spirit body, the Lotus true Qi in his body had directly grown into a lotus flower that was about to bloom!
He could feel the Qi in his body laughing and surging. Any hidden illness in his body would be repaired, and any pain would be soothed.
Every inch of his skin and every cell in his body was filled with vitality!
Although he lacked the foundation of a martial monk and could only unleash the passive effect of the celestial spirit body, to Xu Nan, this was still a huge improvement.
The most direct point was:
He would almost never be beaten to death now.