Ji Ning took things slowly and steadily. He began to challenge the other cultivators on the fourth level. Out of an abundance of caution, Ning didn't challenge anyone who had made it to the fifth stratum in the past. Ning's plan was to wait until he himself made it to the fifth stratum before challenging them.
Here in the Brightshore Kingdom, a single mistake could result in a cascade of errors. There were many freakishly strong cultivators in the Endless Territories who had ended up perishing midway through their journeys. If he was too arrogant, he would probably join them.
Every single opponent on the fourth stratum was incredibly strong, at least as strong as a transcendent World God. They all had their own special skills, and Ning would spend time after each battle meditating on his experiences.
Within one of the astral islands levitating within the fourth stratum.