In the Giant Devil Clan, Ning Fan erased a single day's memories of all low-level cultivators who witnessed Giant Zhi Huo.
Using the power of his memory intent realm, Ning Fan did not harm their Sea of Consciousness and only made them unconscious for one day.
When the low-level cultivators woke up on the second day, none of them remembered Ning Fan breaking through to the Void Glimpse Stage and capturing Giant Zhi Huo.
For Old Ancestor Dong Xu and the others, however, their memories naturally remained.
They were people that Ning Fan had found reliable and worth befriending. Thus, there was no need to make them forget about that incident.
Ning Fan had a lengthy discussion with the four venerated beings and shared to them his comprehension of void and insights in attaining the Void Glimpse Stage. Besides, he also left behind many magic treasures and pills for their forces as compensation for the casualties they suffered.