The slowest improvement was with the Heart Sword Technique.
Initially, it should have been the period when the Heart Sword Technique improved dramatically.
However, there wasn't significant progress.
This was closely tied to his spirit.
The Heart Sword was deeply intertwined with the spirit.
To accelerate the improvement of the Heart Sword Technique, Lu Changsheng's spirit would have to grow exponentially.
Nonetheless, Lu Changsheng had now acquired a Realm of Intention.
In terms of realm, he was no less than Heaven Heart in his prime.
The only difference might be that the Perception Domain was a supplemental domain and couldn't directly enhance Lu Changsheng's combat strength.
But that didn't matter.
The Heaven and Earth Wind Intent had already reached 81%.
Now, Lu Changsheng also had experience in evolving a Realm of Intention.
It was only a matter of time before the Heaven and Earth Wind Intent transformed into a domain.
