After the incident in the third stage, the Pill Sovereign was severely injured and he still needed to stabilize his pill refinement realm.
Ning Fan was also affected by the explosion in the third stage and suffered quite severe injuries.
Thus, he had no choice but to give up on attempting the fourth stage.
Even though the Rain Sovereign still had doubts about him, he was not in the mood to dig deep into Ning Fan for the time being.
The Rain Sovereign was now completely focused on aiding the Pill Sovereign to recover from his injuries and the reason was obvious. Even the entire Rain Immortal World became excited because of the Pill Sovereign.