Apart from the weakness of the initial sword move not being strong enough, the Imperial Sword Art also had a huge weakness.
That was, it needed to continuously attack in order to increase its strength.
Therefore, if there was not enough spiritual energy, there was no way to unleash the final attack.
There was no way to unleash the final attack, which also meant that it was impossible to unleash its strongest power otherwise.
Of course, that problem might have been a lot of trouble for Susan.
However, for Ye Xiao, the problem was not very big.
He had already learned two mental cultivation techniques, both of which were imperial-level mental cultivation techniques.
The Violet Sea of Stars and the Dharma Scripture.
These two mental cultivation techniques were sufficient to support Ye Xiao, allowing him to display the Imperial Sword Art to an extremely powerful level.