Hangu Pass, according to the plateau in the west, bordering the Jiejian in the east, connecting the Qinling Mountains in the south, and the Yellow River in the north, is one of the most famous Xiongguan in ancient China.

Because it is closed in the valley, it is as dangerous as a letter, so it is called Hangu Pass.

Due to the important geographical location, after the establishment of the customs, it has always been a battleground for soldiers. I don't know how many times, the killed war horses neighed, and the corpses were all over the field.

In the past, the alliance of the Kwantung princes failed to attack Qin, and the strong combat power of the Qin army was one thing, and Hangu Pass also contributed a lot.

It will be late, and the people in the valley are even more scarce.

On the castle tower, the soldiers are changing the guard.

It's already winter, it's very cold, and all the soldiers are shrinking their necks.

Suddenly, a gust of wind swept through with an endless chill.

"Shhh Where does the wind come from? ”

"It's cold?"

……

A trembling voice rang out.

A moment later, in the valley, two ethereal figures fell from mid-air.

It's none other than Cao Yi from Chibi, a Nanhua immortal.

Nanhua Immortal walked to a clearing with sparse weeds, his hands kept changing, and he made nearly a hundred complicated seals.

The space trembled slightly, as if it were about to burst.

After a while, a portal glowing purple appeared out of thin air.

"Get in"

The Nanhua Immortal walked in first.

Cao Yi did not hesitate and walked in.

What catches your eye is a black Xiongguan like a giant beast, ten feet high, and there are many traces of swords and fires on the city walls and gates.

The ground is not good, there are potholes, and you can see discarded broken weapons that have lost their divinity, wild beasts or the white remains of people, like an ancient battlefield, more like a place for monks to cultivate.

"Beware of following the old decay"

Nanhua Immortal dropped a sentence and walked in.

Cao Yi followed.

After a while, Cao Yi understood why the Nanhua Immortal was careful to follow him.

The interior of Hangu Pass is completely a dead domain, except for an ancient road that was obviously forcibly opened by someone, the rest of the place contains a terrifying killing machine, not to mention passing through, looking at it for a while, there is a tingling feeling.

Sometimes, you can hear the roar of people or wild animals.

"According to legend, the ancient qi practitioners fought with foreign demons here, and although the ancient qi practitioners successfully defended this place, they also paid a tragic price.

Blood stained this land red, and the power of the law on his body did not disperse, intertwined here, forming a terrifying death domain. ”

Nanhua Immortal explained.

"I see"

Cao Yi nodded.

Half an hour later, the two walked out of the city and passed by a huge altar.

The altar is five-colored, and there are endless five elements of power circulating on it.

"This is the entrance to the secret realm, but unfortunately it will take another three hundred years to enter."

Nanhua Immortal said.

This is the entrance to the secret realm.

Cao Yi glanced at it and contacted the system in his heart: "Time and space treasure box, travel through time and space." ”

"When, where?"

"Two hundred years ago, in situ"

"Go"

The Nanhua Immortal retracted his gaze and walked forward.

After walking less than five steps, he felt a strong suction behind him, turned back sharply, and then showed a look of surprise on his indifferent face.

A one-zhang high and four-foot-wide portal appeared on top of the five-color altar, and the power of the five elements flowed on it.

"Senpai? Is the secret realm open? ”

Cao Yi, who made all this, pretended not to know.

"Why is it open?"

The Nanhua Immortals were confused by this sudden change.

Cao Yi was silent.

After a few breaths, the Nanhua Immortal came back to his senses, pressed his hand on Cao Yi's shoulder, flashed, and entered the portal.

"This?"

As soon as he came in, Cao Yi saw something beyond his expectations.

The so-called secret realm is like a universe that has shrunk countless times.

Stars the size of a fist and the size of a grain of rice float in the air.

The golden threads connect the stars, like some route.

The Nanhua Immortal sat down cross-legged and said, "It was here that the old man got part of the inheritance of the ancient qi practitioners. ”

Seeing this, Cao Yi also sat down.

Half an hour, an hour.

There was no response at all.

Cao Yi simply ran the golden liquid return pill method and absorbed the aura of the plants and trees in the king of ginseng.

When his body was surrounded by the aura of grass-green grass and trees, a faint voice appeared in his head, as if he was talking about the five elements.

"Could it be that the aura of plants and trees has anything to do with it?"

Cao Yi continued to urge the aura of plants and trees in his body.

The faint voice became clear.

It is not about the five elements, but about two scriptures, one is called "Taiyin Zhenjing" and the other is "Sun Zhenjing".

One is to absorb the power of the Taiyin Holy Power, that is, the power of the moon. One is to absorb the true fire of the sun.

One from the direction of the extreme yin, the other from the direction of the extreme yang, elaboration, the five elements, the way of yin and yang, is very obscure.

One day, two days...... 10 days...... Fifteen days have passed.

"Little Friends"

The voice of the Nanhua Immortal rang out.

Cao Yi opened his eyes and saw the Nanhua Immortal coming in from outside. His face was a little solemn.

"Senior, why is that?"

"Lao Yu Shi just went out and learned that Wang Mang had just usurped the Han Dynasty"

Nanhua Immortal frowned slightly.

Wang Mang usurped the Han? Cao reacted quickly.

From 208 A.D., 200 years forward, isn't it Wang Mang usurping the Han.

Great Demon Mentor Liu Xiu is still a teenager this time, and he should still be farming in his hometown.

"Why go back 200 years?"

The Nanhua immortals were puzzled.

"Ding! The power of the Space-Time Treasure Box is about to run out, and if the host does not leave, it will remain here forever. Do you want to leave? ”

Needless to say!

"Leave"

Cao Yi immediately said in his heart.

Out of thin air, a strong suction force appeared, as if to suck everything away.

Cao Yi immediately felt a strong sense of pulling, which was very uncomfortable.

"Hmm"

The eyes of the Nanhua immortals flickered.

Before, when the portal of the secret realm was wide open, this power also appeared.

At this moment, a person who looked exactly like the Nanhua Immortal walked in.

At the same time, the two disappeared.

"Who?"

It looks exactly the same as the Nanhua Immortals.

……

Two hundred years later, the silence is still in front of the five-colored altar.

Cao Yi, Nanhua Immortal suddenly appeared.

"It's back"

The Nanhua Immortal who noticed his surroundings frowned.

……

Three months later.

Hanzhong, the former army camp of the Cao army, the big tent of the Chinese army.

Cao Cao sat on the upper seat, and his front was full of bamboo slips and papers.

Guo Jia sat on the left and was busy, with a pile of things in front of him, which was higher than that in front of Cao Cao.

A figure silently entered the military tent.

Guo Jia raised his head, with a look of surprise on his face: "Sir"

Taking a seat, Cao Cao got up and arched his hand: "I haven't seen you for three months, and Mr. is more beautiful than before." ”

"Poor Dao, here is the book of Hanzhong Wudou Midao Zhang Lu."

Cao Yi took out a silk book from his arms.

A month ago, he came to Hanzhong, not only helped Zhang Lu complete the jump from Wudou Rice Dao to Taoism. He also helped Zhang Lu resist the invasion of Liu Zhang in Yizhou. Therefore, it is deeply relied on by Zhang Lu.

This time, Cao Cao recovered Hanzhong and Yizhou with 30,000 elite soldiers, and Zhang Lu, who had the intention of surrendering, handed over this matter to him.

"Zhang Lu's Book of Surrender"

Cao Cao walked over, stretched out his hand to take it, looked at it for a while, and said with emotion: "Mr. has done the old man a great favor again." ”

"This is the last thing Poor Dao did for the prime minister, and Poor Dao also has a few things to entrust to the prime minister."

Cao Yi said.

"Don't say a few things, a hundred things, the old man agrees."

Cao Cao is very grateful to Cao Yi, who has helped him a lot many times.

"...... like this"

Cao Yi told about Taoism.

Roughly refers to the mythical world.

Cao Cao agreed.

……