Seeing the two falling from the sky, two little children came forward respectfully and knelt down at their feet: "Two immortals, the ancestor god has descended the oracle, and I specially ordered them to wait here. Please follow us."

The Taoist boys had already prepared everything according to the oracle of the "ancestral god". Sun Ang secretly observed that the time flow here was different from the main world outside, and it was much faster.

He and Xing Yixian were taken into a yard, with two opposite houses, with doors open, with jade tripods, alchemy furnaces, and various materials neatly arranged.

"It's here. Please take your seat, two immortals, please leave." The Taoist boys bowed and left, and closed the gate of the courtyard. Xing Yixian didn't look at Sun Ang, and snorted coldly with his hands behind his back and turned around and entered his house.

Of course, Sun Ang would not have any good looks on him. He roughly looked at the entire yard and then entered his own room.

The Chenxu Ancient Tree has a high level, and even for the creator, it is a very rare eighth-level material. This kind of big tree has a very long lifespan and can usually grow for thousands of years, but it must be more than ten thousand years before it will be called an "ancient tree".

When the ancient Dust-Emperor trees that are more than ten thousand years old will undergo some small changes. Under their thick and hard bark, there will be an additional layer of soft new skin every year.

This new tree material is excellent, like rice paper, and can transmit the energy of the essence very well. It is the best among the essence materials.

However, the Lihuoyan Mei Seal is a fire element seal, which is naturally restrained by the wood element material.

To successfully carve, the bark of the ancient tree of Chenxu must be fabricated. This kind of manufacturing requires the use of the means of making alchemy, so this is a problem for the alchemist.

It is very difficult to perfectly master the skills of three basic professions and cooperate with each other.

Xing Yixian had basically given up. Although he had a high opinion of himself, he didn't feel that he could surpass the dozens of sages and predecessors. So he looked at various materials in the house, tried them a few times, and waited for the time to come, and then went out to "gate" with Sun Ang.

This made him very upset - I obviously should win, but that kid was so lucky that he actually got such a difficult problem.

...

Sun Ang was flying with his hands, and all kinds of mysterious and profound treatment methods were constantly being used. In a small jade tripod in front of him, a piece of bark of an ancient tree was rolling in the medicine juice.

The medicine juice was thick, and flames rolled up from time to time, which caused them to roll around the bark of Chenxu ancient trees and had not been really burned.

For today's alchemist, this is indeed a century-old problem, but for ancient alchemist, this is just a slightly "difficult" test.

The current level of alchemists is indeed still a certain gap from the true heyday of this profession in history. However, the gap is not as big as imagined.

The biggest difference between the present and ancient times is that everyone is exploring different directions.

Today's alchemist is almost completely different from ancient alchemist in terms of the direction of alchemist refining. Therefore, although everyone has some similar skills, they have great differences in concepts.

However, there is often not only one way to the end, so none of us fails, but all of us succeeds.

This problem is also because the concepts of ancient alchemists are different from those of the present, and the treatment methods have also changed a little, so it has become much simpler.

Sun Ang shook his hand, and a purple flame rolled out of the medicine juice, wrapped around the bark of Chenxu Ancient Tree with a whoosh, burning the bark of the palm-sized bark to ashes almost instantly.

Sun Ang smiled bitterly and had to start over. It was indeed not easy to refine the alchemy tool.

No matter which kind of respected profession is prominent in front of others and is highly respected, it is accompanied by a very high failure rate and a long lonely and lonely guardian.

Sun Ang tried it more than a dozen times before he processed the bark of the Chenxu ancient tree, and then began to carve the Lihuoyan Mai Seal on it. Although the bark has been processed and has a high tolerance for fire element, it is still a wood element material after all. Therefore, you must be careful during the seal carving process, and take protective measures while carving.

Sun Ang was already cautious, but his lack of experience still made him fail four times in a row.

After these four times, Sun Ang felt that his energy was about to be exhausted. He breathed a sigh of relief and threw all the ingredients aside, then slept on the soft couch on the side. After getting up, he simply did it himself and made a sumptuous meal with the Danfuton, and had a beautiful meal.

After he cultivated his spirits, he started again.

"laugh--"

A flame emerged from the bark of Chenxu ancient tree, and along the lines of the talisman seal that had been engraved, quickly burning the entire bark to ashes.

Sun Ang scratched his head awkwardly: "I'm too full and I'm not focused."

The next two times, but still failed. Finally, it was time to start four times. He tried his best to rescue a mistake and completed this seal carving in fear.

When the last rune was completed, Sun Ang breathed a sigh of relief, and suddenly felt a little unbelievable: It was actually completed?!

"It's really done." He confirmed by himself that the bark of the ancient Chenxu tree that had already been engraved with the seal of Lihuoyan, completely met the requirements. He held it in his hand and smiled bitterly: "It's really much more difficult than I imagined. As expected, the sky street is deep, and any question is this difficult."

He put the bark in a box and walked out in his sleeve.

The limited completion time for this difficult problem is ten days. Sun Ang failed one after another, and the time of rest in the middle was almost ten days when he walked out of the house.

Not long after, the door of Xing Yixian's room was also opened, for exactly ten days.

"Greatly send you two immortals." The two little Taoist boys leaned over and bowed, and a sacred golden light shot down from the sky, covering the two of them, and flew towards the sky with a whoosh.

...

Outside Zhuyan City, in the Taoist temple on the mountain, everyone had been waiting for a day. According to the time Tai Shenghua said, they appeared in the yard on time the next day.

As soon as Zhao Minglie and Cao Jiawu met Tai Shenghua, they hurried up to inquire: "Sir, who do you think can win?"

Tai Shenghua looked a little weird, and hesitated for a moment and said, "This game must be a draw, and the second game must be played." Then he continued, "According to the concept of fairness of Tianjie, if you make the second game, you must make the third game, and you must make the final decision with two wins in three games."

"Ah?" The two supreme strong men were surprised: "Sir, why is this?"

Tai Shenghua smiled bitterly and said, "You may not know about this question, but it is really the three hundred-year problems of my Tianjie..."

As soon as he explained, the two of them felt relieved and shook their heads and smiled bitterly: "It seems that the answer will take two days later. They are really..." The two of them didn't know what to say. There were thousands of questions in that thousand treasure box, but they chose this one.

"They are back." Tai Shenghua said, with a wave of her sleeves, a golden light flew out. The two were wrapped in a holy light and flew out of the upper forest world with a whoosh.

After landing on the ground, the two saluted Tai Shenghua first. Sun Ang had calculated from the greetings of the supreme powerhouses around him that the ratio of the time flow rate in the main world and the upper forest realm was one to ten, and there were only one day in the main world.

Tai Shenghua looked at the two of them and asked routinely: "Have you both solved this problem?"

His hand had been retracted into his sleeves. When the two of them shook their heads together, he would announce the second game and directly release the Qianzi Treasure Box to let them continue to choose the topic.

As expected, Xing Yixian stepped forward, bowed and said, "Disciple has never solved this century-old problem."

Tai Shenghua nodded and looked up at Sun Ang again.

Sun Ang was a little surprised: "A century-old problem?"

Tai Shenghua nodded and said, "Yes, this is one of the three hundred-year problems of my low-level alchemy master in Tianjie, so even if you try your best, you can't do it. Don't be discouraged. It's not that you are not strong enough..."

Xing Yixian was extremely jealous, and Your Excellency Tai Shenghua kept encouraging Sun Ang. This is the benefit of someone behind it, alas.

But Sun Ang slowly took out the box in his sleeve with a strange expression, put it on his hands, and said with some uncertainty: "Senior, I did it, but since it is a century-old problem, it must not be that simple. Please see if I did it wrong?"

"Has it been done?" Tai Shenghua was stunned, and then he felt relieved when he heard what Sun Ang said. He stretched out his hand and said, "Okay, although he did it wrong, it's good to have the courage to try."

So Sun Ang handed over it, Xing Yixian sneered on the side and said four words lightly: "Overbial power!"

Tai Shenghua glanced at him, a little cold. Xing Yixian shrank aside, not daring to say anything more.

Tai Shenghua opened Sun Ang's wooden box, twisted the bark with two fingers, gently rubbed it, and a stream of Yuanjiu was injected into it. On the bark, the Lihuoyan Seal shined.

"Hmm?" Even Tai Shenghua shivered and almost fell down.

The fourth-level Lihuoyan Seal is engraved on the bark of the ancient Chenxu tree, with powerful wood energy support, and the power of the Lihuoyan Seal is increased several times!

Simply put, this principle is to add firewood to the super fire.

A trace of dark golden flames flew out, which caught Tai Shenghua off guard and almost burned his hair.

"It turned out to be successful!" Tai Shenghua was shocked, and a light shield was stimulated in time in his hand, covering the entire ancient tree of Chenxu, and then he controlled the power of Li Huoyan's emptiness seal.
Chapter completed!