by Fat Bread
I don't know what the practice method of a real swordsman is, I only know the sword skill I created.
So, keep calculating, this is my only way to become stronger.
If I can accomplish it someday, I will give it an inscrutable name.
Yun Hai's Quadrant Sword.
The basic of learning it is to study "Nine Chapters on Mathematical Art" and "Geometrical Principle".
Chapter 387: The Library
"This is... the practice method of Yun Hai's Quadrant Sword..." Yun Xi blinked. He suddenly found that the speech of the old White Lotus Sword Master had finished.
It seemed that it was a memory of Yun Hai the Sword Master, it was a memory about how he created Yun Hai's Quadrant Sword.
However, Yun Xi found something familiar in his memory.
The bonfire, the strange world, and the green hippos.
Did Yun Hai enter a trial world of the stars?
Maybe only Yun Hai himself knew the answer. Apparently, he didn't get help from anyone, no one explained the rules to him like what Mei'er did for Yun Xi, he entered the trial world without any preparation.
The only lucky thing was his enemies were weaker than what Yun Xi faced before. He could practice his sword skill using the Honeybees, Grass Spirits and Big Grass Spirits.
The unlucky thing was he had only a wooden sword. Yun Xi had an iron sword and learned the breathing method from Hua Huo before, as for Yun Hai, he literally started from zero.
Fortunately, Yun Hai created the invisible Yun Hai's Quadrant Sword due to this experience, which was a god sword skill that wasn't inferior to Hua Huo's Sky Flying Sword.
Yun Xi knew the road he had gone through, and now, he could study Yun Hai's sword skill from the beginning.
"Nine Chapters on Mathematical Art... and Geometrical Principle..." Yun Xi murmured and decided to read the two books first.
After the speech, the disciples left in small groups. The next important thing to them was to pick classes.
It wasn't a common thing to listen to "Explain the Tao". White Lotus Sword Domain wasn't a prosperous Holy Land of Sword Skill like the Great Xia Sword Domain, there were only a few swordsmen who were entitled to explain the Tao here.
At other times, disciples needed to pick the classes themselves. Since most disciples were not geniuses who were 100% sure that they could enter the hero rank and become one of the top ten disciples, choosing proper classes and a good tutor were very important to them.
Otherwise, if they couldn't reach the peak of the third rank within five years, they would be driven away and wouldn't even be admitted as a disciple of the Sword Palace. They would stay in the mortal world forever and could never come back to the sword tip area.
Of course, the geniuses from other sword domains didn't need to worry about this. Their goals were the projection of the White Lotus Secret Treasure from the beginning.
"Library, where is the library?" Yun Xi didn't go to pick classes immediately like other disciples. He had walked around in the wide yard of the sword palace for a while, but didn't find where the library was.
"The library? It doesn't open to new disciples." Several disciples answered him.
"The library? I don't know. We come here to practice our sword skills. There are no godly martial arts in the library, why do I need to go there?" Most disciples held this view.
Finally, a female disciple who looked very kindly told him the location of the library.
"It... isn't it too small?" Compared to other buildings, the library was too small and inconspicuous in a corner of the sword palace.
It was a three-story small wooden house, located beside a lake. Compared to it, the several female disciples walked beside the lake were more eye-catching.
Bunches of green Virginia creepers grew on the walls, making the small house melt into the environment.
"Sorry, the library doesn't open to new disciples, it only opens to tutors. If you are looking for common literature, there is a big library in the town nearby, you can go there." The librarian lazily took a glance at Yun Xi and said.
There were a lot of valuable books in this library, and many of them were the only existing copy in the world. Only elite disciples and tutors could come here to borrow books. New disciples were not allowed to borrow materials here.
"Well... I should have the permission to borrow books here." Yun Xi hesitated for a while, then took out the shell with an hourglass shaped pattern.
Since the shell could let him come and leave the girl's dorm freely, it should also work here.
"This... it's..." Looking at the shell in Yun Xi's hand, the middle-aged librarian froze and rubbed his eyes.
As the librarian, he felt that it looked familiar, but couldn't remember what it was clearly.
He was sure that it wasn't from the White Lotus Sword Palace, but he had a very special impression about it.
Oh, I remember it! Of course, it's not a permit of the library or anything from the sword palace itself, how can such a thing be the token of a small library in a lower-level sword domain!
Anyone who held it could even enter the palace of the Great Xia Empire freely, not to mention this library!
"The Battle God's Token, the token of the sixth Sky Sword..." The librarian murmured. His legs were shaking.
Compared to the person who could obtain this token, he, an unknown librarian, was as weak as an ant! Even if he was killed, no one would dare to seek revenge for him!
"Of course... you can borrow books here... I will give the authority for you immediately..." The librarian only wanted to cry. If time could turn back, he wouldn't say a word just now!
"Thank you." Yun Xi let out a sigh of relief. It seemed that his cheap teacher's reputation was really useful here.
Chapter 388: The Hard Entry Qualifications
"Hum?" After walking into the library, Yun Xi found that the library wasn't small at all.
Looking at it from the outside, it was just a three-story wooden house, but its inside was incredibly wide.
"Is its inner space expanded by magic?" Looking at the over ten-story spiral staircase and the aisles amongst one bookshelf after another, it couldn't be just a three-story house.
Moreover, there was a light curtain covering the entrance of the basement, which meant that there was a wide space under the ground too.
Yun Xi drew out the shell and touched the light curtain, just like what happened when he touched the magic circle of the girl's dorm, this light curtain straightly disappeared. Apparently, the Sky Sword's token could be used here too.
However, he wasn't going to go to the basement now. He was just looking for some beginner books.
Geography, astronomy, history... math! Yun Xi found the books he needed on the third floor.
The beginner books to learn Yun Hai's Quadrant Sword were just some basic math books.
However, don't look down on them. They were the cornerstones of math, the base of calculating.
"Well, let me borrow more books." After finding "Nine Chapters on Mathematical Art" and "Geometrical Principle", Yun Xi picked up several other books on the bookshelf.
"Probability Calculus."
"Introduction to Calculus - Even a Monkey can Understand it!"
"Theory of Real Number."
The five beginner books were what Yun Xi was going to read as the introduction to mathematics.
After picking up the five books, he looked at the books on the top of the bookshelf. Immediately, he felt that he might be a monkey, because he didn't understand the titles of the books at all.
"Is the Cat Dead or Alive?"
"I Will Kill that Damned Cat!"
"The Ghost Cat of Mathematics, Two Theories about the Question of Yun Hai the Sky Sword."
"36 Proof Techniques to Verify if the Cat is Dead or Alive."
"It's Wrong to Torment the Cat!"
"I Will Eat that Cat!"
"I Don't Believe this Theory! I Prefer to Believe that Cats never Exist in this Wor
ld!"
"Yun Hai, Fuck You and Your Cat!"
A pile of books all referred to a mysterious cat. Looking at the names of the authors on the books, Yun Xi found almost all the names of the top mathematicians he knew, including a dragon, and someone was directly cursing Yun Hai the Sky Sword in the title.
It seemed that all the mathematicians all over the world were in a towering rage when referring to the cat.
"It must be a very strong cat!" Yun Xi thought. It seemed that Yun Hai was the first person who put forward the theory about the cat.
He had a feeling that if he wanted to master Yun Hai's Quadrant Sword, he would have to face that cat sooner or later.
...
Deep In the night, Yun Xi lay on his bed with a painful look.
"It's too difficult to understand the content of the books! Are they really just the basic knowledge to learn Yun Hai's Quadrant Sword?" Yun Xi didn't expect that it was so hard to study mathematics!
He just read "Nine Chapters on Mathematical Art" and "Geometrical Principle", and they had made him fall into the endless computation of infinite loops.
Because he was already a hero ranked Baker, his strong hero ranked mentality helped him a lot.
At the hero rank, his computation speed was hundreds of times faster than ordinary people. He could calculate Pi to hundreds of decimal places and instinctively kept calculating.
To ordinary people, it wouldn't be a problem because humans would instinctively give up thinking about the thing that was beyond their computing power. But to Yun Xi, he just couldn't turn a blind eye to the formulas!
What's the limiting value of this angle? What's the threshold of this unknown number? Why did the computation fall into an infinite loop?
Before he went to the sword palace, he only learned add, subtract, multiply and divide because he needed to record the income of his family’s bread shop every day. The four fundamental operations of arithmetic were sufficient for him at that time.
After studying the knowledge in "Nine Chapters on Mathematical Art" and "Geometrical Principle", he finally understood how hard the real mathematics was.
It was a "Tao" that could explain everything in the universe. "Mathematics" didn't stand for truth, because it was a process that was used to pursue the truth of the universe.
From mathematics, people could sum up the nature of astronomy, physics and even the world itself. It was a wisdom that applied to every place in the entire god's domains, which was sufficient to be the core of the godlike sword skill, Yun Hai's Quadrant Sword.
"How did Yun Hai create his sword skill by using math? It makes no sense!" Yun Xi only felt awe about Yun Hai's wisdom.
He was sure that Yun Hai's Quadrant Sword wasn't possible to be mastered by ordinary people, because only the best geniuses of math could learn its basics after endless failures.
Compared to Hua Huo's Sky Flying Sword, Yun Hai's Quadrant Sword seemed to be easy to study, however, it was actually more difficult than any sword skill Yun Xi had ever known.
It seemed that everyone could learn the basics of Yun Hai's Quadrant Sword by reading "Nine Chapters on Mathematical Art" and "Geometrical Principle", unfortunately, it was just a delusion.
Even Yun Xi, whose computation speed was hundreds of times faster than ordinary people, felt the strain of learning the basics of Yun Hai's Quadrant Sword, not to mention other people. Perhaps Yun Hai was a real super genius of math, just like Hua Huo was a super genius of sword.
"No, I should stop calculating!" Yun Xi pressed his hands on his head. It wasn't a sword skill he could learn now. He even doubted that Yun Hai's understanding about math had entered the legend rank when he created this sword skill.
Only super geniuses of math could learn the basic of Yun Hai's Quadrant Sword, as for when could they master it? Only god knows.
"Nah, forget it. Let's me try Teacher Casina's gift first." With a sad look upon his face, Yun Hai touched the shell in front of his chest and gave the words.
"Open for me, the Sky Tower!"
Chapter 389: Dreamlover
Yun Xi found that he was in the incredible dream again.
He stood in front of the door of cloud and looked at her.
Today, she was still guarding the door on the golden seashore.
She was the guardian of the door, the last warning line stopping any intruder from getting close to the door.
Three strands of icy blue hair stood upright on her forehead; her slender braided hair was hanging behind her. Her cuffs were inlaid with steel-blue gems while a double-edged sword sheath with a pendant on it was hanging on her waist; she gave off a very icy-cold and alienated aura.
While she was inserting her huge blue-slanted sword back into its sheath.
That sword made her slender body seem even more slender. Her blade also seemed to give off a cold silvery-white aura. Just the sword hilt alone was already over half a meter long.
The hilt of the sword and the edge of the blade seemed to share a single central connection point. The point seemed to be a circular compass, and in the middle of that compass was a huge keyhole. Apparently, something was sealed there.
Yun Xi had the same dream again and again and again, and every time, his end was the same.
Every time, he would be killed by her sword.
However, he was never afraid of this dream.
Why?
Because this girl in his dream was the first person who touched his heart?
This was his deepest secret, even Hua Huo didn't know about it.
First love, no, it was an emotion that was much stronger than that. Her figure had left in his heart a long time ago.
Hua Huo was his first love in the real world, and she was his first dreamlover in his dream world.
The difference was that Hua Huo was a girl next door, who he could see every day, and she was as unreal as a foam, who he could only find in his dream.
She was his dreamlover.
However, he was just a self-invited soul in her eyes. Every time she saw him, she would brandish her sword toward him.
Her sword was cold, containing the power that could even freeze your soul. He didn't even remember how many times he had been killed by her sword.
However, this time, she didn't brandish her sword. She just stood in front of the door and didn't even take a glance at him.
Hum? Isn't her attitude different today? Yun Xi couldn't help but stretched out his hand, pinching his face.
"Ouch!" Yun Xi looked at his hands in surprise.
This was the first time he felt "pain" in this dream!
Not only so, everything in this time became a hundred times clearer than the dreams before!
Everything looked the same, but something was changed.
Looking at her, she was still like a silver gem on the golden seashore, sparkling cold lights, lonely and beautiful.
"This is... me?" Looking at his own hands, Yun Xi found that he obtained a "real body" in this dream.
Walking to the sea, he saw his reflection in the water.
It wasn't his own body!
Brown skin, slender body, a mask with three golden pupil like patterns, ponytail and bared feet.
Apart from these, there was also a special mark above his head - an hourglass-shaped mark.
This... it was apparently his teacher, Casina's body!
"Is this really a dream?" Yun Xi pinched his arms and clearly felt the pain.
However, it wasn't simply a feedback of the body, but a feedback of the soul.
"Ha ha, my cute disciple, don't pinch this body, I will feel embarrassed." When Yun Xi was making blind and disorderly conjectures, he heard Casina's voice.
"I know you must have a lot of questions, but there is no time to explain them. This is just a pre-recorded message."
"I found that your body has some problems, but I don't know how to cure your body. Therefore, I gave your body my identity, and you can go to the Sky Tower, looking for solutions yourself."
"The real Sky Tower isn't any of the towers in the real world, they are just the projections of the real tower."