Could it be that it was during that battle when the Heart Sword advanced?
"It seems the Heart Sword must be used frequently in combat to improve."
Lu Changsheng highly values the Heart Sword as well.
However, the explosive progress of the Heart Sword this time is still attributed to the strength of the demonic and human martial artists. Although their spiritual power appeared to be weaker, in reality, it was far stronger than that of ordinary martial artists.
An ordinary martial artist couldn't withstand even one strike from Lu Changsheng's Heart Sword.
How could he effectively train the Heart Sword like that?
If it were just about activating the Heart Sword, wouldn't Lu Changsheng simply continuously activate it to practice?
The improvement of the Heart Sword is probably closely tied to obliterating the opponent's spirit.
As for the specific mechanism, Lu Changsheng remains uncertain.
Nonetheless, he has discovered a method to enhance the Heart Sword.
