Whoosh!

The Enraged Lava Spirit, Curis, swung its open palm as if it were swatting a fly. Kang Oh moved to the side, avoiding its attack, and then diagonally swung Ubist. 

Darkness Strike!

His blade unleashed a jet-black wave. Curis shielded itself with its arm, causing the appendage to blacken. 

Bam!

"Ugh." Kang Oh scowled as Curis's blackened arm hit him. It felt as hard as a diamond. 

'It can harden its body, huh. In that case...' 

Kang Oh leapt into the air and swung downwards.

Slash!

A white line followed his blade's path. All of a sudden, however, an unexpected system message popped up. 

[Proficiency in Slash has reached 100%.]

[Slash has risen to high-rank.]

[Slash has become more powerful.]

[Slash leaves behind a wound, and also causes the target to bleed.]

'Now that I think about it, I haven't checked my proficiency in a while. When I have the time, I should check my other skills too.'

High-Rank Slash! What a joyous occasion. But now wasn't the time to celebrate. After all, he was battling Curis...