Chu Ruonan was about to inject his own Gang Qi into the dark green rune, but Lu Chen suddenly reminded: "Be careful, if the dark green rune needs a large amount of Gang Qi to be injected to give birth to a real change, you immediately give up injecting Gang Qi and cut off the connection between yourself and the dark green rune." ”

Judging from the signs when Chu Ruonan injected a trace of Gang Qi into the dark green rune before, Chu Ruonan should not be in danger. But there must always be some preparation, after all, at this moment, he needs Chu Ruonan to have some spare strength to maintain the gorgeous petals around him. If Chu Ruonan's dantian qi in the sea of qi is exhausted, he will lose the lingering of gorgeous petals. Without the gorgeous petals, it would be difficult for him to stay in front of the ancient tree palace peacefully.

Chu Ruonan nodded slightly, concentrating on controlling the operation of his own qi.

She didn't know anything about prohibitions and formations, but there was a strange rune spirit array on the Ancient Tree Palace. She knew very well in her heart that with her own strength, it was impossible to unlock the secret of this strange rune spirit array. She couldn't solve the secret of the strange rune spirit array, let alone wanted to enter the ancient tree palace to explore.

She didn't know where the Shattered Cloud Army's Formation Grandmaster was, and at this moment, Lu Chen was her only hope.

More Gang Qi was injected into a dark green rune in front of him, only to see that the dark green rune that had been injected with Gang Qi once again bloomed.

This time, there was more Gang Qi infused into it, and the green glow from the dark green runes was brighter than just now, and the trembling amplitude was also stronger than before.

Lu Chen looked over and saw that the dark green rune seemed to be flying out of the trunk of the ancient tree.

At this time, Chu Ruonan turned his head to Lu Chen and said his feelings, "Gang Qi has not been consumed in large quantities. ”

"It's time to stop. Lu Chen nodded and commanded.

Chu Ruonan immediately withdrew her hand, and the dark green rune lost her qi and fell silent. The dark green rune light gradually dimmed, and the trembling gradually subsided. Eventually, the dark green rune lost all movement and became a part of the trunk of the ancient tree again, as if it had never been there.

Lu Chen pondered.

Chu Ruonan waited quietly and patiently on the side, and from time to time a trace of qi escaped from his fingertips, maintaining the gorgeous petals around Lu Chen.

"The Gang Qi in your dantian qi sea can cause all the dark green runes on the ancient tree palace to change just now?" Lu Chen ended his contemplation.

Chu Ruonan didn't answer immediately, but escaped a spiritual power, and her spiritual power slowly circled around the ancient tree palace.

Then Chu Ruonan nodded, "There are a total of fifty-seven thousand dark green runes on the Ancient Tree Palace, and to make all the dark green runes move the same as the previous dark green rune, I need to use forty percent of my strength." ”

"As long as it's not all the power, do it. Lu Chen bowed slightly.

Chu Ruonan didn't hesitate, the palm of her jade hand was facing the entrance of the ancient tree palace, and pieces of gorgeous petals flew out of her palm, like a stream of petals flowing quickly towards many dark green runes.

Sneer......

In an instant, all the 57,000 dark green runes on the Ancient Tree Palace were activated, and the entire Ancient Tree Palace suddenly bloomed with a dazzling green light, and the 57,000 dark green runes trembled in unison, as if they were about to fly out of the Ancient Tree Palace. Although all the 57,000 dark green runes were activated, there seemed to be a force that restrained many of the dark green runes, preventing them from actually flying out of the trunk of the ancient tree.

"Have you found anything?" Chu Ruonan turned his head to look at Lu Chen again, activating many dark green runes had already consumed forty percent of the Qi in her dantian qi sea in an instant. To sustain herself, she would need to continuously infuse her own qi into many dark green runes. If Lu Chen didn't find anything, her efforts this time would be in vain.

Looking at the many trembling dark green runes, Lu Chen frowned and pondered, and did not respond to Chu Ruonan in time.

Chu Ruonan didn't know what Lu Chen's attitude was, so he could only continue to exude his qi and maintain the activation state of fifty-seven thousand dark green runes.

She looked inward with her spiritual power, and noticed that the Gang Qi in her dantian qi sea was rapidly decreasing like a low tide.

"These dark green runes can't really fly out of the trunk of the ancient tree, as if they lack some kind of power...... Lack of some kind of power......" Lu Chen groaned, suddenly thought of something, and snorted, "Maintain the Gang Qi infusion, and then release your spiritual power and inject it into all the dark green runes." ”

Chu Ruonan didn't hesitate, wisps of spiritual power invisible to the naked eye escaped from the center of his eyebrows, and injected into the fifty-seven thousand dark green runes.

Sneer......

With the blessing of Chu Ruonan's spiritual power, many dark green runes seemed to suddenly have wings, and they flew out of the trunks of the ancient trees one after another.

Runes that emitted a faint green glow flew in the air.

When the last dark green rune flew out of the trunk of the ancient tree, the 57,000 dark green runes that had been densely scattered all over the ancient tree palace suddenly converged in front of the gate of the ancient tree palace like a hundred birds returning to their nests. Many dark green runes that glowed with a faint green light converged in front of the portal, forming a green light cluster in that place, dazzling wisps.

More and more dark green runes converged, and the green light burst out even more intensely.

The green light cluster was not far in front of Chu Ruonan, but Chu Ruonan gradually couldn't see through what was going on in the green light cluster.

Lu Chen secretly transported the power of sea knowledge into his eyes, and then he narrowed his eyes and stared at the green light in front of him. I saw that in the dazzling green light, many dark green runes flew in the air, either fusing with each other to form new runes, or connecting with each other to form new rules of order.

After contemplating it, he found that the fifty-seven thousand dark green runes seemed to be constructing something.

"Keep it up. Lu Chen immediately commanded.

Chu Ruonan nodded, although she couldn't see through the magical changes in the green light cluster in front of her, she vaguely guessed that the changes that were taking place in many dark green runes were a good thing. Lu Chen and she were unlocking the magic of this ancient tree palace little by little, maybe when the changes in the green light cluster stopped, they would be able to enter the ancient tree palace to explore.

Thinking of this, Chu Ruonan did not skimp on his own qi and spiritual power, and continued to inject a steady stream of light into the light cluster in front of him.

Time flies.

Chu Ruonan's delicate body trembled slightly, and fine beads of sweat escaped from her pale forehead. continued to exude a large amount of qi and mental power, making her body a little unbearable.

"There are only three percent of spiritual power and qi left. Chu Ruonan snorted.

"Go on!" Lu Chen responded calmly.

Chu Ruonan couldn't see the changes in the green light cluster, but he could see clearly that the changes in the dark green runes in the green light cluster had not completely ended.

Ninety percent of the dark green runes had disappeared, and there was still the last one left. Chu Ruonan still has thirty percent of his strength left, and he can fully support it. If they stop at this time, their exploration will be in vain. If you want to explore this step further, you must wait until Chu Ruonan recovers her strength.

And the premise is that after they suddenly stop, there will be no other unknown magical changes in many dark green runes.

Chu Ruonan gritted his teeth and insisted.

Lu Chen paid attention.

A moment later.

The green light suddenly dissipated, and the void in front of the portal of the Ancient Tree Palace condensed into a green disc like a stone mill. This green disc is made up of a small disc and four circles from the inside out. There are many ancient runes on the central disc and the outer four circles.

Fifty-seven thousand dark green runes were finally condensed into a strange green disc!

At this time, the central disc and the four outer circles slowly rotated. The central disc and the four circles, combined with the ancient runes on them, seem to form a vast sea of infinite changes.

Looking at the green disc that was close at hand, Chu Ruonan knew that whether they could enter the ancient tree palace to explore, and whether they could unlock the mystery of the green disc in front of them. But at this moment, she had no choice but to look at Lu Chen behind her, hoping that Lu Chen would be able to crack the green rune disc.

Looking at the green disc, Lu Chen groaned, "Qian, Kan, Gen, Zhen, Xun, Li, Kun, ......"

He knew these eight runes, when he used the Cold Ice Jiao Reverse Scale to break the ban in the center of the Birth Gate in the Bone Devouring Forest, he knew some of the meanings of these eight runes through the magical ability of the Ice Jiao Reverse Scale to reflect the flawed runes, and these eight runes represented the direction of the eight trigrams.

However, there were far more than these eight runes in the green glowing disk, there were other runes. Lu Chen knew that Qian, Kan, Gen, Zhen, Xun, Li, Kun, and Dui, but he couldn't unlock the magic of the green disc.

At this moment, a voice suddenly sounded in Lu Chen's mind.

"This is the Five Elements Bagua Array. Gu Linglong said.

"Five Elements Bagua Array?" Lu Chen said puzzled.

"It is a large array formed by using the power of the five elements and the changes of the eight trigrams. Gu Linglong explained to Lu Chen concisely.

"Linglong, since you know the Five Elements Bagua Array, can you unlock the secret of this green and shining disc?" Lu Chen was contemplative on the surface, not letting Chu Ruonan notice the abnormality, and secretly asked Gu Linglong.

"This Five Elements Bagua Array is not too complicated, and it is not difficult to unravel it. Gu Linglong said slowly: "But before you start cracking, you must know whether the five elements are born together, or the five elements are mutually reinforcing." If you get this wrong, the green disc will shatter. At that time, anyone who wants to enter the Ancient Tree Palace can only break through with force and blast through this Ancient Tree Palace. ”

When he was still in the hollow in the middle of the sand sea, he approached the Flame Palace and unleashed his most powerful blow, but there was no trace of it on the Flame Palace.

Glancing at the Ancient Tree Palace, Lu Chen knew that if he wanted to break the palace with his strength, he was afraid that he and Chu Ruonan would not be able to break the portal of the Ancient Tree Palace together.

Gu Linglong may not be able to blast the palace with his hands.

"What is the five elements of mutual growth, what is the five elements of mutual restraint?" Lu Chen asked.

He knows that fire begets earth, earth begets gold, and gold begets water...... I also know that Jin Kemu, Mu Ke Tu, Tu Ke Shui, etc., but I have a vague understanding of the deep meaning of the five elements contained in it.

"The five elements are wood to fire, fire to earth, earth to gold, gold to water, and water to wood. Gu Linglong patiently explained, "The wood makes the fire, the wood is warm, the fire lies in it, and the fire comes out, so the wood makes a fire." Fire gives birth to earth, fire can burn wood, wood burns to ashes, ash is earth, so fire gives birth to earth. The native gold, the gold dwells in the stone and soil, and is born with Jinrun, and the soil becomes a mountain, and the mountain must be feldspar, and the native is born of gold. Gold gives birth to water, less yin qi, moistens dry and flowing Jin, sells gold for water, and mountains and rocks run from moist, so gold gives birth to water. Those who grow wood in water can be born in water, so they grow in water. ”

After Lu Chen digested it, Gu Linglong said again: "The five elements are gold and wood, wood and earth, earth and water, water and fire, and fire and gold. The five elements are mutually restrained, the nature of heaven and earth, the many are better than the few, so the water is better than the fire. Essence is better than strong, so fire is better than gold. Rigid and soft, so gold wins wood. Specializing in the dispersion, so the wood is better than the soil. The real is better than the virtual, and the homeland is better than the water. ”

Lu Chen chewed it carefully, and realized something in his heart.

"There is only one chance, and the most important thing is to determine whether the formation here is the five elements of each other or the five elements of each other. Gu Linglong said.

Lu Chen frowned and pondered.