Frustration and...?

Klang! Klang! Klang! K...

Covered in pitch-black darkness, my sword clashed with the shadowy sword a dozen times, leaving dents all over it as its edge started to resemble a line of teeth instead. However… 

'It's not there yet.'

Even as the damage produced by my makeshift use of the technique that I didn't grasp yet doubled against the shadowy figure, it was obviously still far away from the ability of the complete technique itself...

Not to mention the correct use of Darkness elements' strength, just the complete integration of my sword essence with it would produce at least double or triple the enhanced damage!

Nonetheless, disregarding that point, just the effect of training the technique had already allowed me to pass through the second floor of the tower without spending much time, it could even pull me through the floor if I was more focused on that instead of putting most of my focus into crossing the last step needed to grasp the technique.