Final change
Lex, of course, knew none of this. He had completely lost himself in his cultivation. There came a point in which he was undergoing the change where his mind became numb and he lost all awareness. His sense of time, of self, of anything and everything was lost.
This was the most dangerous part of his cultivation, and was the reason why cultivators completely isolate themselves before they undergo any cultivation or breakthroughs, major or minor. Right now, he was completely vulnerable, with no possible way to protect himself at all.
The extreme danger of this state was one of the primary reasons why humans on Earth were not able to break through to this realm despite having thousands of Golden core cultivators. Only very extreme or unique circumstances would create the situation that allowed this to happen.