，

Ye Lao is a very good research object, Fang Yun can do all kinds of research on Ye Lao to his heart's content.

And Ye Lao's fighting spirit is basically inexhaustible, at least during the research, Ye Lao basically doesn't shout tired.

Fang Yun also compared immortal energy, magic power and fighting energy, if you only compare energy, immortal energy should belong to a higher level of energy, magic power is inclined to the soul, and fighting energy is inclined to **.

At the same time, Fang Yun also learned that when the Dou Qi and Magic Power reached the Fifth Order, they would condense their Dou Spirit, and the magic was the Demon Soul.

Whether it is a demon soul or a fighting heart, they all have uniqueness, just like human fingerprints.

Different exercises, different people, personalities, environments, cultivation methods, and breakthrough methods will all cause different fighting spirits and demon souls.

Fang Yun hadn't studied the Demon Soul, but he had studied the Night Old Fighting Heart, and the Night Old Fighting Heart was a black dragon.

Although it is only a form, it is an extension of the fighting spirit, although there is no consciousness, but it has a fighting instinct, after being promoted to the fifth order, affected by its own state of mind, the fighting spirit will also reflect different emotions, rage, anger, excitement, or fear.

After the fifth order, every time he advanced, Dou Xin would also grow differently, if Fang Yun's understanding, this growth would be similar to evolution, and at the same time, it would be more spiritual.

In fact, the fighting heart is very similar to the Yuan Infant of the cultivator, but the reason is that it is impossible to fight, if the Yuan Infant is destroyed, the cultivator will be destroyed, and it can be said that the Yuan Infant is the doppelganger of the cultivator.

The fighting spirit is condensed by the fighting spirit, although it is tangible, but unconscious, so even if it is destroyed, it will quickly condense another same fighting spirit, but its owner will also be affected and consumed differently.

It seems that Douxin is more practical, but in fact, the improvement brought by the Yuan Infant is immeasurable, if the gap between the fifth order and the fourth order is a world of difference, then the gap between the cultivators in the Yuan Infant Period and the cultivators who cultivated before the Yuan Infant Period is the gap between people and gods.

The cultivators of the Yuan Infant Stage can already be described as penetrating the heavens and the earth, calling for wind and rain, and the strength of their physical bodies has also reached the level of immortality, and the longevity has increased several times.

Fang Yun's research on Ye Lao has been carried out for more than ten years, and the results achieved can be said to have given Fang Yun a comprehensive understanding of Dou Qi.

Ten years ago, Ye Lao took the initiative to ask Fang Hao to become Fang Yun's entourage and protect Fang Yun at the same time.

In fact, this was also Fang Yun's initiative to let Ye Lao follow him, which would also facilitate his research.

Thirty miles outside Yancheng, here is a stone forest of chaotic divisions, the stone pillars are of different lengths, the images are different, the area covers the square clouds for hundreds of miles, it is particularly spectacular.

This is a natural wonder formed naturally for millions of years, and the residents of Yancheng call this place a pile of rocks.

Because there are often falling rocks in the rubble, few people come here, but at the moment, there are two figures in the rubble.

A young man sat under a stone pillar, sheltered from the blazing sun, clutching a large, bright red apple in his hand and taking a bite.

Not far away, Ye Lao gently swung out a palm, the palm wind was strong and powerful, and at the same time, with a scorching black wind, it swung towards the current boulder.

The boulder, which was five zhang large, shattered in response, and the rubble flew and splashed in all directions, and a fist-sized piece of gravel shot in the direction of Fang Yun without warning.

The night boss was startled, his brain was hot, he let out a low sigh, and pushed his palms towards Fang Yun's top.

A black light more than ten zhang long flashed, and it was a black dragon, and the black dragon swept over the gravel, and the gravel seemed to be melted, and instantly dissipated into the air.

The black dragon did not pause, and continued to blast towards the stone pillar on Fang Yun's head, only to hear a loud rumbling sound that spread throughout the entire stone forest.

Fang Yun still looked relaxed, as if it had no effect, the thirty or forty zhang high stone pillar behind him was directly hit by the black dragon and broke by his waist.

"Old Night, a piece of gravel, you don't have to make such a fuss. Fang Yun took a bite of the apple and said with a smile.

Ye Lao laughed awkwardly, he also felt that he had gone too far, although he believed that the gravel would not hurt Fang Yun, but subconsciously, he still regarded Fang Yun as a child.

In the eyes of the night elders, even in the Fang family, they all regarded Fang Yun as a child.

Of course, in terms of age, Fang Yun is not an adult, fourteen years old did not make his face take off his childishness, and Fang Yun's heart is more like an ignorant naughty boy.

"Ye Lao, your fighting spirit seems to have improved a lot this year. Fang Yun asked.

Ye Lao nodded and said, "Indeed, in the past ten years, my fighting spirit has reached the peak of the seventh order and the first grade, and I believe that in less than half a year, I will be able to try to break through." ”

"The night is old, it doesn't take half a year. Fang Yun said confidently.

"Yun Shao, what do you have in mind?"

"I'll prepare for the next two days, and then you will come to my small courtyard. Fang Yun said: "I also want to study and see what difficulties there are when the fighting spirit breaks through the bottleneck." ”

Now that Ye Lao is old, Fang Yun has no doubt about his words, as long as Fang Yun says that it can be done, it will definitely be done.

Although Fang Yun has been studying his fighting spirit for the past ten years, most of the reason why his fighting spirit has grown so significantly is due to Fang Yun's help.

Fang Yun was relatively familiar with Ye Lao's fighting spirit, of course, since this was himself studying others, Fang Yun couldn't fully understand the changes in Ye Lao's fighting spirit.

There are some things that Fang Yun can get results through accurate deduction, and there are some things that cannot be deduced from the results.

Derivation is a unique term in the cultivation world, and the cultivator can be said to be a high-speed supercomputer due to the supernormality of his own divine thoughts, so he can derive some theories through his own calculations.

The stronger the Divine Thoughts, the more complex the results could be obtained, and with the Divine Thoughts that Fang Yun could use at present, it was not enough to deduce the current growth results of Ye Lao's Dou Qi, so he could only study and analyze it through his own observations and the exploration of Immortal Qi.

Back in the city, Fang Yun asked Ye Lao to go home first, while he found a shop that specialized in energy crystals.

The shopkeeper immediately greeted him, and the shopkeeper first glanced at Fang Yun, and then asked in a somewhat cold tone, "This young master, what do you want?"

This shopkeeper didn't know Fang Yun, seeing that Fang Yun was only fourteen or fifteen years old, and the clothes on his body were not particularly luxurious, so he felt that Fang Yun was not here to buy energy crystals.

After all, most of the people who came to buy energy crystals were not teenagers like Fang Yun.

"Energy crystals. Fang Yun ignored the shopkeeper's dog eyes and looked down on people, there were so many such people in this world, Fang Yun naturally didn't bother to pay attention to it.

"This young master, the energy crystals in our crystal workshop are all high-quality, and there are no low-quality ones like a few taels of silver. The shopkeeper was slightly stunned, and then spoke again.

"Give me thirty mid-grade and five high-grade energy crystals. Fang Yun continued.

"Thirty intermediate energy crystals are three thousand taels, and five high-grade energy crystals are five thousand taels, for a total of eight thousand taels. "The shopkeeper obviously didn't realize that the young man in front of him was indeed a 'big customer', and he still had an arrogant look.

He still stubbornly believed that Fang Yun's age didn't know the value of the energy crystal, and of course, most teenagers of Fang Yun's age couldn't come up with so much money.

Fang Yun touched it in his arms, took out a stack of silver tickets, counted eight and threw them to the shopkeeper.

In the past few years, Fang Yun has been abducted and deceived by the boss Fang Tianna, and there are twenty or thirty pieces of silver in his hand.

When the shopkeeper saw Fang Yun's silver ticket, his eyes were straight, and an evil thought unconsciously rose in his heart, looking at Fang Yun's eyes, there was always a trace of unnaturalness.