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As both of them started to clash swords, they soon entered a special mystical state where they forget about anything but each other. It was as if they were inside their own little world.

Rein had never learned swordsmanship from anyone and the style he used was something he had developed himself after fighting hundreds of millions of opponents throughout all of his lives.

It was a very effective form of fighting but at the same time, it was also extremely unpolished. The main reason behind that was Rein\'s circumstances. For the majority of his lives, Rein had always been a genius and the strongest person around.

That, in turn, made it impossible for him to learn from someone else as no one was capable of doing better than Rein.

That was the biggest reason why even after so many lives Rein\'s fighting style, especially in the weapon art division, had reached a bottleneck and he was unable to improve it anymore.

But after he started to fight the final boss, he witnessed for the first time a sword skill that had surpassed his own by a large margin. Normally this would have made a person to be filled with despair after being out-matched in such a way. But for Rein it was different.

Rein was like a thirsty person who had found a lake of fresh water in the middle of a desert after seeing the final boss\' skills. He immediately started to soak all the knowledge he could gain from this spar.

After exchanging blows for a few hundred times, even the final boss was surprised by Rein\'s growth speed. She felt like this person had talents equivalent to her or even greater. She was interested to see what this person was capable of doing in the future.

For that reason, instead of immediately overwhelming Rein, the final boss started to fight in such a way it looked like she was giving Rein a training. The effect was immediate and Rein increased his speed of growth.

...

In his whole life, Rein had only managed to create only three sword king art techniques. He had nothing to reference from and it was the result. But now Rein was able to use the final boss\' arts as reference and he was able to come up with two brand new Sword King Art techniques.

From the looks of things, it looked like Rein was doing exceptionally well. But actually that was not the case at all. Rein was using all of his abilities to fight against the final boss.

But the armoured menace was doing nothing but was using pure swordsmanship and regular stats to handle Rein at his best.

Even then, it was not having a hard time doing it. Actually it was having a very easy time handling whatever Rein was capable of throwing toward it. This was a show of absolute power. The last boss had not used magic even once in this fight.

Even though Rein was getting a very good training session, he was not very happy about it. He wanted to have a heart to heart conversion with this opponent but now his own incompetence was stopping him from accomplishing that.

Rein became even more determined to at least reach a level where he would be able to have the ability to convey his feelings to this person. That was the least Rein could do when this person was literally doing him a favour by giving him a chance to train.

This time Rein started to use his everything to reach close to the level where this final boss was standing. Not only gus swordsmanship but other things about him also started to improve, like his magic control, elemental law utilisation and more.

Seeing Rein so fired up, Kagura also got influenced by it. When her beloved master was working so hard, what kind of sword she would be if she did not keep up with him. She was going to support her partner even if she needed to go above and beyond to do so.

The final boss suddenly felt that something changed in its opponent. He suddenly became more brilliant. So much so that she needed to take him seriously if she did not want to get hit by one of his attacks.

But still she did not use anything other than her pure physical abilities and that was proof of how insanely powerful she actually was.

But still this was enough to attract its attention and the final boss started to feel an emotion it had never felt before. It also noticed that the opponent was trying to tell it something by clashing swords with it over and over again.

Soon it also started to focus on the message to learn what this person wanted to say to her. And soon enough Rein\'s first message reached it. It replied back in the same way and they finally started to have a conversion.

Rein was extremely happy to finally be able to have a conversation with this person in front of him. He put his life on the line and only then he was able to gain the qualification to talk with the final boss.

Rein was overusing his chromatic affinities to achieve this result, so he would not be able to keep it up for long. But still he wanted to use this time to get to know this person better.

As their conversation went on and on, Rein started to understand the person in front of him. But still he could feel that there was still a wall between them and there was only one way for him to break that wall. And that was by defeating her.

Obviously Rein was currently incapable of truly defeating her but according to the conditions of this battle, just landing a solid hit on her would be enough to secure victory and Rein was determined to do so.

But doing so was easier than done. In the duration of this battle, Rein had improved a lot but still he was one step away from being able to land a hit in her. So he dug deep into his talent and potential and decided to try a move he was planning for a long time.

Suddenly some golden strikes appeared in Rein\'s pure crimson hair and his golden eyes also had a red glow to them. And after that for a moment, for a single moment, Rein\'s powers reached a height he had never experienced before.

At that exact moment, he executed not the new sword king arts he had just learned but the art he had mastered with his beloved partner Kagura, Deity\'s Fall. Kagura also unleashed all her potential at that moment.

It was truly an all out attack and Rein had performed it at an exact moment when his opponent was showing him an intentional opening to lure him in.

Rein\'s attacks landed and the eternal grade helmet that was covering his opponent\'s head went flying. The face of a beautiful girl with silver hair and blue eyes was revealed. Seeing that Rein gave her a happy and caring smile and then immediately fainted. He had won the battle.