Dream Entry Technique!
This was the technique left in the crystal. However, what gave Chen Fei a headache was that this crystal was not complete. According to the information above, a complete crystal should consist of five pieces, but what Chen Fei held in his hand was only the first piece.
So, the Dream Entry Technique that Chen Fei had obtained was only a small part of it. When practicing it, if he were facing someone with weaker mental power or less pure mental power than his own, this Dream Entry Technique could still be used.
After all, this Dream Entry Technique was indeed a formidable mental technique. It could lead people into a dream world, making it difficult for others to detect any issues.
However, if someone's mental power was stronger than Chen Fei's, they would quickly discover its flaws. In that case, if the opponent followed the dream and directly attacked his Core Soul Origin, it could become a significant problem.