The sight of this sword technique truly amazed Chen Fei. He had no idea who had created this technique, nor did he understand the concepts and training methods involved, all of which were quite different from many other mental techniques.
Yes, the Sword Return Eye was indeed a mental technique. Whether it was in driving or cultivation, it involved the transformation of mental power, much like the Godslayer Sword and the Slaughter Spirit Technique.
However, while the Godslayer Sword and the Slaughter Spirit Technique were focused on killing enemies, the Sword Return Eye leaned more towards being a form of assistance.
Of course, what the Sword Return Eye ultimately mentioned, being able to extract traces from the past, was not something that could be done at any time; there were limitations to it.