This method of erasing memories was not rare in the cultivation world.
In order to ensure that certain secrets would not be leaked, cultivators would often use special means to seal or erase their memories of certain things.
Under such circumstances, unless one could turn back time, it was impossible to find what had been erased.
If Tang Zhen's main body was here, he would naturally be able to enter the river of time and gather some scattered information.
However, at this moment, he had no other way. Because once he used his main body's power, it would be equivalent to completely exposing himself.
It was a small matter to be discovered by the demon subduing troop. Once discovered by the gods of the Haotian plane, they might be expelled by the other party, or even go to the void to snipe.
At that time, Tang Zhen could only choose to temporarily retreat no matter how strong he was.