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While Chu Yang was forging the third flying sword, he was also familiar with the sword formation. He often controlled two flying swords and constantly simulated the attack form of the formation.

At night, Chu Yang came to the yard. At this time, a silver long sword was suspended above his head.

This state has lasted for nine nights. As long as there is moonlight, Chu Yang will appear in the yard and let this long sword that has been successfully smelted absorb the essence of moonlight.

After it accumulates enough power, Chu Yang will insert the sword into the ground to absorb the breath of earth in the earth veins.

As time passed, the appearance of this long sword began to change slowly. The original light silver sword embryo has turned light yellow, and the sword body also emits a light yellow light.

The spirit sword was initially completed. Chu Yang sat alone in the room and began to take the next step.

At this time, Chu Yang held a yellowish stone in his palm, which was the desert god stone that he had photographed before.

This Desert God Stone is a top-level earth attribute spiritual treasure, which contains abundant earth attribute aura. In addition, there is a trace of newly bred spirituality in the Desert God Stone.

When Chu Yang penetrated the spiritual consciousness, he could feel a weak spiritual consciousness like a baby curiously exploring the world.

What Chu Yang wanted to do next was simple and difficult. The last step was to transform the Desert God Stone into earth attribute aura and completely integrate it into the spirit sword to merge the two into one.

However, Chu Yang tried three times in a row without success. The depths of the Desert God Stone seemed to have a resistance force and could not be integrated at all.

After flipping through the sword manual again, Chu Yang saw a hint on it and finally understood why.

The earth attribute spirit sword has very high requirements for the purity of the material. Many materials have too many impurities, which has caused the current situation, so they cannot be integrated.

Chu Yang has spent a lot of energy and material resources to forge this spirit sword. If he does it again, even Chu Yang cannot bear such a huge loss.

There was no other way, so Chu Yang had to ask the master of the weapon refining in Tiangong Workshop if there was any way to further purify the cast sword embryo.

Relying on Qin Yuqing's face, the master of the weapon refining in Tiangong Workshop also gave him face. After several masters with hundreds of years of weapon refining experience communicated with him, they came up with a special method.

That is to add a material called Tianyuan Essence. This material is integrated into the sword embryo and can actively precipitate impurities. After all the impurities are removed, and then smelted repeatedly, the Tianyuan Essence will be discharged, achieving the effect of purifying impurities.

However, Tianyuan Essence is very rare, and even the cause is controversial.

After consulting the masters, Chu Yang learned a disappointing news that Tianyuan Essence is not commonly used.

Refining magic flying swords certainly has certain requirements for the impurities contained in them, but it is not necessary to be completely pure. Therefore, when refining ordinary magic flying swords, after multiple forgings, the impurity content can meet the requirements, and there is no need to be completely pure.

Such a high requirement as the earth attribute spirit sword is absolutely a necessary condition for refining flying swords above the Dao level.

Therefore, ordinary weapon refiners can't use this kind of thing at all, resulting in a very weak sense of existence of Tianyuan Jing, and even no circulation in major business houses.

After asking around, Chu Yang could only return disappointed.

Seeing his depressed expression, Qin Yuqing was very concerned. When she learned that he needed a material called Tianyuan Jing, she took the initiative to ask someone to check the classics to see if there was any information.

After this search, relevant information was actually found in the classics collected by the City Lord's Mansion.

It is said that a long time ago, there was a special bird called Fire Crow in Qingxu. This divine bird has the blood of the Sun Golden Crow and is very powerful.

These Fire Crows flock together and never act alone. Wherever they pass, everything turns to ashes. They are almost invincible.

However, this invincible Fire Crow also has a fatal weakness, which is that it is difficult for them to find food, because ordinary food will be burned to charcoal before it enters the mouth.

Therefore, the food of the fire crows is also very special. They do not eat ordinary fireworks, but specialize in swallowing a kind of minerals. This mineral lives in a specific place.

After the fire crows swallow the food, they need to secrete a large amount of gastric juice to melt these minerals. The feces excreted by the fire crows will condense into a kind of crystal, which is the Tianyuan essence.

Therefore, this Tianyuan essence has the function of purifying impurities.

What worries Chu Yang is that the number of fire crows recorded in the classics was already rare at that time, and Tianyuan essence naturally became a scarce thing.

Some cultivators can occasionally find a little Tianyuan essence excreted by fire crows, but most people do not know the value and discard this thing like a worn-out shoe.

The classics do indicate some habitats of fire crows. After asking Qin Yuqing, he learned that this place is at least 700 miles north of Fengtian City on Dongyun Mountain, where there are still some habitats of fire crows.

After hearing about this place, Chu Yang couldn't wait, but now Fengtian City has been stared at by the red-faced old demon, and it is probably difficult for Chu Yang to leave the city openly.

However, Chu Yang did come up with a brilliant idea, which was to use a puppet to pretend to be himself and attract the attention of the Red Powder Demon, while his real body quietly left the city from the other side under the cover of Qin Yuqing.

After bypassing the Red Powder Demon, Chu Yang headed all the way to his destination. Three days later, Chu Yang arrived at the Dongyun Mountain mentioned in the classics.

This barren mountain range had long been devoid of grass, and even the soil was a burnt black color, as if it had been burned by flames.

It was undoubtedly very difficult to find a piece of Tianyuan essence within this 800-li mountain range, just like looking for a needle in a haystack.

Chu Yang trudged through these barren mountains, searching every inch of the ground, hoping to find a piece of Tianyuan essence.

However, after searching for more than ten days, he did not find a real piece of Tianyuan essence.

This boring thing naturally made him very anxious, but there was only this last step to casting the earth-attributed flying sword, so Chu Yang had to be patient and continue to move forward.

In the next two days, Chu Yang finally found a clue.

Before setting off, Qin Yuqing introduced him to an old monk named Chen Xiake. This old man liked to travel around famous mountains and rivers, and his footprints almost covered the entire Qingxu world. He was very familiar with the customs and habits of many places.

Chu Yang wanted to find the Tianyuan Essence, so he naturally thought of visiting this old man to see if he had any clues.

Chen Xiake was not too proud of his own things. After learning about his purpose, he took the initiative to provide some useful information.