章 165: Chapter 165: Focus on wind element

"Damaging the wall, two inches," Lucifer echoed as he looked at the sword mark on the wall.

'If I attack too strongly, the wall will break. I should not aim to destroy the wall and just barely touch it,' he thought as he clenched his fist and punched the wall.

Even though he tried to attack as weakly as he could, a crater was left on the wall, which was at least five inches deep. 

"Too deep. Even weaker," Lucifer repeated as he attacked again after he changed spots. 

Unfortunately, this time his attack was so weak that it only made a crack on the wall. 

In the distance, Kellian was observing Lucifer, shaking his head. 

"It will take a long time, it seems. But this will give him a sense of his strength," he said as he folded his arms.

The attacks of Lucifer continued as he kept shifting location in the room after destroying walls occasionally.