Experience was key. 

Kang Oh had already taken Ubist's trial thrice. He fought Ubist without much difficulty, despite the darkness obscuring his vision.

Because he shared levels with it, Ubist was much stronger and faster than before. However, its attack patterns were still too easy to read. Kang Oh would dodge an attack using his Hyper Intuition, and then strike at a weak point. 

There was no reason for him to roll onto the floor like last time. His fundamentals had improved to such an extent that he could block Ubist's vicious attacks without much difficulty.

Plus, he'd realized something about Ubist's trial. 

'The Demonic Swordsman is the greatest of all Swordsman classes. This trial was originally meant for a Master Swordsman.'

The test blinded the challenger and prevented all skill use. Ubist's power also changed depending on who wielded it.

What kind of person would be able to overcome such a trial?

The individual's senses had to be well-trained, so much so that they could fight without relying on their sight, and they had to be skilled enough to fight off Ubist without using...