Zhang Ruochen held a pencil in his hand, constantly pouring true energy into the pen, and his spiritual power was fully immersed in the world of the sixth-grade array pattern.

  Rumble

  Outside, the sounds of attacks kept coming, and the entire underground palace was shaking non-stop.

  Han Xuan stood nervously beside him, not daring to make a sound, afraid of disturbing Zhang Ruochen.

  About an hour had passed when Zhang Ruochen finally put down his brush. It wasn't until then that he realized his entire body was drenched in sweat.

  Zhang Ruochen slowly exhaled and took out a few Ling crystals from the spatial ring, continuously striking them into the recesses on the stone wall.

  Eight hundred and sixty-four spiritual crystals were fired in a row, completely filling the recesses on the stone wall.

  "Success or failure depends on this one move." Zhang Ruochen's palm pressed against the stone wall, pouring his true energy into the array pattern.

  The true energy flows with the formation of the seal, fully activating all 864 spirit crystals. Those spirit crystals keep flashing, just like hundreds of bright stars are inlaid on the stone wall.

  "Whoosh"

  The stone walls of the underground palace lit up with lines of texture, densely packed like a spider web, forming a defensive array.

  "It's done! It's done!" Zhang Ruochen burst out laughing.

  Han Yu was also excited, and his gaze at Zhang Ruochen had a few more points of admiration. "Zhang Ruochen, you're too amazing! The formation masters of the Cloud Platform Sect can't even do it, but you did!"

  "It's just a repair of about 70 or 80 percent of this six-tier formation, it doesn't count as much. However, using this damaged formation to block the way to Huo Jing City should be enough. We can now rest and recover from our injuries, and then slowly think of a plan to deal with Huo Jing City." Zhang Ruo Chen smiled.

  Han Yu's gaze fell on the ring on Zhang Ruochen's finger.

  "From a single ring, hundreds of spirit crystals can be taken out, it must be a spatial treasure." Han Xiao thought to himself.

  After hesitating for a moment, Han Xuan still didn't go ask, after all that was Zhang Ruochen's secret. If she asked, it's possible she would be misunderstood by Zhang Ruochen, thinking she had greedy intentions towards the spatial treasure.

  Under the protection of the six-grade residual array, Huo Jing City was indeed unable to break in.

  After two days, Zhang Ruochen's injuries had finally healed.

  The wound all over the body has healed completely, leaving only some faint scars.

  The true energy in the air sea has recovered to its peak state, and compared to before, it seems to have increased a lot.

  After the recent series of intense battles, Zhang Ruochen discovered that the sacrificial power within his body had actually fully merged with his true energy, and his cultivation had reached the peak of the Minor Extreme Realm.

  "In the heat of battle, the power of the ritual can actually merge so quickly. Next time when absorbing the power of the ritual, I will definitely use combat to merge the power."

  Zhang Ruochen glanced at Han Xuan and found that she was still recovering from her injuries.

  She was originally more seriously injured than Zhang Ruochen, and it would naturally take her longer to recover.

  Another day passed, and Han Xiao's injuries had healed, her spirit and energy fully restored. She opened her eyes, and two sharp rays of light shot out from the dark pupils, emitting a powerful aura of martial arts.

  As she withdrew her true energy back into her body, the light in her eyes also dissipated, returning to calmness.

  Han Yu's gaze turned towards Zhang Ruochen, and found that Zhang Ruochen was drawing something on the ground.

  She walked over and stood behind Zhang Ruochen, looking down at him.

  Only on the ground can be seen a mysterious yin-yang bagua pattern, surrounded by small text labels.

  In the pattern, two little men holding war swords are comparing sword moves.

  "This is"

  Han Xuan took a deep breath, mobilized his own sword intent realm, concentrated his spiritual energy, and stared at the yin-yang eight trigrams diagram on the ground again. He found that the two small men holding war swords seemed to have come alive, floating on the ground, constantly swinging their swords, making moves, and stepping on the ground, displaying a series of exquisite swordsmanship.

  The yin and yang eight trigrams pattern, as if it came alive, constantly rotating.

  "Mind of the Sword"

  Han Xiao exclaimed: "Your attainments in the way of the sword have reached such a realm, I estimate that you're not far from achieving Sword Heart Transparency!"

  A sharp mind and clear insight, that is indeed a legendary state.

  Since she was young, Han Xuan's skills in swordsmanship have far surpassed those of her peers. Even her father said that she has the talent of a saint and is the most outstanding sword genius in the Cloud Platform Sect in the past hundred years.

  Even back then, when Han Xuan and Zhang Ruochen were competing in sword fighting, she lost to Zhang Ruochen, but she still thought that she was only slightly inferior to Zhang Ruochen. As long as she worked hard, she would definitely be able to surpass Zhang Ruochen.

  It wasn't until now that she realized her own realm in swordsmanship was actually so far apart from Zhang Ruochen's.

  Zhang Ruochen didn't respond to Han Xuan's astonishment, pointing at the pattern on the ground with his hand, saying: "This is a yin-yang dual-sword array. Only two martial artists who have extremely high attainments in swordsmanship can fully unleash the power of this sword array. Our swordsmanship has reached the peak where our swords move according to our hearts. If we were to unleash this sword array, it would be enough to kill Huo Jingcheng."

  "You want me to learn this sword formation right now"

  Han Xuan furrowed his brow and said: "This sword array is extremely profound, I estimate that without a year or two of time, it's fundamentally impossible to reach the state of complete mastery."

  Just a glance, Han Xuan had already discovered the mysteriousness of the Yin Yang Two Instruments Sword Array.

  Zhang Ruochen said, "There's no need to reach the state of fusion and penetration, just being able to exert one-tenth of his power would be enough to defeat Huo Jingcheng. I'll give you three days' time, with your skills in swordsmanship, it should be sufficient."

  Han Xuan looked at Zhang Ruochen with some confusion and said, "The Cloud Platform Sect also has some combined sword arrays, but at the very least, three people are needed to form a sword array. Moreover, it also requires the assistance of an array base jade stone to exert its full power."

  "If there was no assistance from the Array Base Jade Stone, relying solely on a sword array that could only exert one-tenth of its power, it would be impossible to defeat Huo Jing City"

  Zhang Ruochen said, "The role of the Array Base Jade Stone is to use the array method to connect the true energy of the martial artists who set up the formation. However, the Yin Yang Two Instruments Sword Formation does not need to rely on the array method, but rather relies on the sword intent between two martial artists, allowing the sword intent to connect the power of the two martial artists together."

  "So it was." Han Xiao said.

  Other warriors did not understand the profound meaning of "sword intent resonance", but Han Xuan, who had a high level of swordsmanship, could comprehend it. Therefore, Zhang Ruochen only mentioned it briefly, and she suddenly enlightened.

  Zhang Ruochen continued to explain the subtleties of the Yin and Yang Two Forms Sword Array to Han Xuan, hoping to help him grasp it faster.

  "The Yin and Yang Double Instrument Sword Array is based on human array foundation, with the heaven and earth as the compass, and the mysterious power of yin and yang as the driving force. If the two people in the array can cooperate to the extreme, reach the unity of sword intention, they can evoke the spiritual energy of heaven and earth. Human strength is limited, but the heaven and earth are boundless. As long as one can evoke the spiritual energy of heaven and earth, creating any miracle is not surprising."

  "When arranging the sword array, you and I belong to the yin eye and yang eye in the array respectively. The yang eye moves, and the yin eye moves. The yang eye stops, and the yin eye stops."

  "In coordination with the sword formation, there are only eighteen moves in total, known as the Yin Yi Nine Swords and the Yang Yi Nine Swords. As for other sword moves, they completely depend on the situation at the time and adapt randomly within the sword formation. I believe that with your attainments in swordsmanship, you should be able to cultivate the Yin Yi Nine Swords to the entry-level realm within three days."

  Han Yu's hands were clasped in front of his chest, and he raised an eyebrow slightly, saying: "You also look down on me too much. With my attainments in swordsmanship, I can master the Yin Yi Nine Swords to the entry level within one day. Three days is enough for me to master the Yin Yi Nine Swords to a small success."

  Zhang Ruochen stared at her for a moment, then continued: "If the Yin-Yang Two Instruments Sword Array were that easy to cultivate, it wouldn't be known as the strongest two-person sword array. Back in the day, I and Chi Yao..."

  At this point, Zhang Ruochen suddenly stopped and smiled slightly, saying: "The nine moves of the Yin Yi Jiu Jian sword technique are already carved here. You can start practicing now. How much you understand depends on your comprehension. If there's anything you don't understand, come ask me whenever possible."

  After saying this, Zhang Ruochen walked to the other end of the underground palace and began to cultivate "Yang Yi Nine Swords".

  Han Xuan gazed deeply at Zhang Ruochen and said: "He's really a strange person."

  Han Yu's perceptiveness was indeed very strong, exceeding Zhang Ruochen's expectations. He spent only two days and three nights to cultivate the Yin Yi Jiu Jian to the entry level.

  Of course, during this period, Zhang Ruochen also repeatedly corrected her mistakes in swordsmanship, carefully guided her and unreservedly imparted some of the tricks of Yin Yi Jiu Jian to her.

  After cultivating the Nine Swords of Yin Instrumentation to the entry level, Han Xuan finally truly understood the profoundness and depth of the Yin Yang Two Instruments Sword Array.

  Even without the Yin Yang Two Forms Sword Array, just this set of "Yin Form Nine Swords" is more brilliant than those top-grade spiritual swords, with an incomparable and mighty power.

  In the Yun Tai Sect, there is only one kind of top-grade spiritual sword technique, and it's also incomplete with some missing parts. That set of sword techniques is considered the strongest in the Yun Tai Sect, but compared to the Yin Yi Nine Swords, it's a difference of 108,000 miles.

  Previously, Zhang Ruochen said that the Yin Yang Two Instruments Sword Array was the strongest two-person sword array, and Han Xiao had some disdain for it. However, now she completely agrees with Zhang Ruochen's point of view.

  The powerful sword arrays of the Yun Tai Sect were simply inferior compared to the Yin Yang Two Instruments Sword Array.

  Han Yu said, "Just to cultivate the Yin Yi Nine Swords to the entry level, it took almost three days. To cultivate to a small success, I estimate that at least a month is needed, or even longer. If other warriors were to cultivate this, I estimate that even after a year of time, they would still be unable to reach the entry level."

  "You've only cultivated the Yin Yi Nine Swords to the entry level, but whether we can tacitly cooperate and display the Yin Yang Two Instruments Sword Array is still an unknown quantity."

  "Is it that difficult?" Han Xiao asked.

  "You'll know once you try it"

  Zhang Ruochen took out the ancient sword of the Abyss, stood in a circle that had already been drawn, pointed his sword horizontally, and the entire person's temperament changed dramatically.

  His back straightened, his eyes gleamed sharp, like a young sword god.

  Han Yu stood in another circle ten feet away from Zhang Ruochen, holding a white jade ancient sword with one hand and pointing it at Zhang Ruochen. The aura on his body was completely different from before, and together with his stunning looks, he looked like a beautiful sword immortal.

  The two had not yet drawn their swords, but around them, a number of sword auras had already appeared.

  "Move"

  Zhang Ruochen spoke a word and stepped out seven steps to the right, each step exactly one zhang away.

  As Zhang Ruochen's feet began to move, Han Xuan also moved immediately.

  "Whoosh whoosh"

  Both are skilled swordsmen, moving quickly in the sword array and performing one move after another.

  In the entire sword array, it was as if eighteen figures appeared, each practicing a different sword move.