The night was dim, and the thick clouds blocked the moonlight, and Liu Yu and Sun Kang performed worldly light skills like ghosts, stepping on the wild grass and tree branches in the woods on the outskirts of Beiluancheng City.

Liu Yu and the five did not choose to fly with a high-altitude sword, or cast spells such as "Wind Resisting Technique", because they drove their spiritual power to hurry, and the spiritual light emitted was too ostentatious in the darkness, which would attract the attention of people with hearts.

The five of them gathered out of Beiluan City, and after marching for two hours, the surrounding woods became denser and denser, towering ancient trees stood up, shrubs and weeds were overgrown, and it was difficult to get off their feet, and everyone had to jump forward between the thick branches, like mountain monkeys, and the speed was not slow.

Liu Yu found that a piece of fish belly white appeared in the sky in the distance, and before he knew it, it was early in the morning, everything was recovering, the air was extremely refreshing, and the birds and beasts in the originally silent mountains and forests were endless. But because the trees are too lush and green, the surroundings are still dim.

"Alright, stop and rest for a while!" Sun Kang said as he stopped on a protruding rock.

"It's okay, Brother Liang in a while!" He Anqing stopped on the trunk of the tree and looked behind him, and said worriedly.

"Don't worry, Senior Brother Liang will follow. Fang Lanlan stopped beside He Anqing and said.

Sun Kang took Liu Yu, He Anqing, and Fang Lanlan in front, and Liang Zheng followed behind after a certain distance, Liang Zheng's cultivation was the highest, and the scope of spiritual sense exploration was also wider, and he was responsible for guarding the rear to prevent several people from being followed by Xiaoxiao.

Liang Zheng relied on the instruction function of the Zongmen jade card, and he was not afraid of losing it, and if there was a situation, he could also send an early warning message through the Zongmen jade card.

Liu Yu and Sun Kang sat on the rocks, He Anqing and Fang Lanlan sat on the trunk of the banyan tree on the side, and the four of them did not speak, and began to calm their minds and breathe and recover their energy.

The sound of "sand, sand, sand" came from far and near, and Liu Yu and the four stood up vigilantly. Soon, he saw Liang Zheng's figure, speeding through the woods, rushing towards them.

"Brother Liang, it's okay!" He Anqing greeted him and said with concern.

"Liang Zheng, there's no movement!" Sun Kang also asked.

"It's okay to rest assured, no one is following. Liang Zheng replied boldly.

After resting for a quarter of an hour, the five of them set off again, and the five of them changed their way of travel, and the imperial envoy's flying sword flew against the treetops, and after entering the black and white mountains, the mountains were undulating, and the vast forests were sea, so that it was not easy to be discovered.

Everyone flew non-stop for a long time, Sun Kang led the way in front, Sun Kang has been in Beiluancheng for almost ten years, often enters the Black and White Mountains, and is very familiar with the various situations in the Black and White Mountains, and has extremely rich experience.

Before Liu Yu joined, Sun Kang took Fang Lanlan and the three of them into the Black and White Mountains several times, and each time they had a lot of gains, and won the trust of the three of them.

Sun Kang frowned and shouted loudly backwards: "In front is the 'Black Haze Poisonous Forest', let's go around it." ”

"Senior brother, you lead the way!" Fang Lanlan replied indifferently.

"Senior brother, is it really the 'Black Haze Poisonous Forest' ahead? I heard that there are thousands of "Black Haze and Poisonous Forests" in the Black and White Mountains, which are extremely dangerous. Liu Yu Yujian came to Sun Kang's side and asked curiously.

"Whether it is a "black haze poisonous forest", the junior brother will know later. Sun Kang said with a sale.

"What Senior Brother Sun said must be right, Senior Brother Liu has never seen Senior Brother Sun's power. He Anqing said.

After the five of them crossed a mountain range, they saw a black mist in the distance, stretching for dozens of miles, covering the sky and avoiding the earth, like a demon domain, and it was indeed the rumored "black haze poisonous forest".

"Look! Senior Brother Sun is right!" He Anqing said with a smile.

"Senior brother, how did you know that we were close to this 'Black Haze Poisonous Forest'?" Liu Yu couldn't help but ask.

In fact, it is very simple, the closer you get to the "black haze and poisonous forest", the higher the concentration of yin qi around you, just pay careful attention to the changes, and even at night you can avoid breaking into the "black haze and poisonous forest". Sun Kang said with a smile.

"Why is the concentration of yin qi in this place so high?" After Liu Yu was reminded, he probed the surroundings through his spiritual sense, and found that the concentration of yin qi in this place was even higher than that in Gaocang Kingdom, and asked puzzledly.

"There is a 'yin vein' deep in the underground of the Black and White Mountain Range, and the 'black haze poisonous forest' was formed by the eruption of the underground yin vein..."Sun Kang patiently explained.

It turns out that the formation of the "black haze poisonous forest" is because of the outbreak of the underground yin veins, a large amount of yin qi gushes from the ground to the surface, enveloping a large area of dense forest, countless flowers and trees die and decay in a short time, producing a thick miasma and poisonous smoke, yin qi, poisonous smoke, and miasma are mixed together, and it is extremely dangerous to break in.

"Don't get too close, let's go around from the left, this "black haze and poisonous forest" is not large, and it won't take much time. Sun Kang said cautiously after observation.

Because the "black haze poisonous forest" is filled with all kinds of poisonous gases, the forest sea is open, the mountain wind is howling, and there are a lot of poisonous smoke and miasma floating on the edges.

"Senior brother, the last time we passed by, it didn't seem to be this "black haze poisonous forest". Fang Lanlan looked around and asked uncertainly.

The four of them went to the location of the green pear fruit tree several times, although Fang Lanlan was not as familiar with the road along the way as Sun Kang, but there were also some vague images, when they returned to Beiluan City two months ago, they did not encounter this "black haze and poisonous forest" when they passed through this place.

"Senior sister, you're right. This "black haze poisonous forest" was formed in the past two months, the "yin vein" under the black and white mountain range is extremely unstable, no one knows when and where it will suddenly erupt, without the slightest warning, in this endless mountain range formed thousands of "black haze poisonous forests". Sun Kang said.

This is also the origin of the name of the Black and White Mountains, "black" means "black haze poisonous forest", and "white" refers to the overlapping peaks and peaks, steep and colorful snow-capped mountains. Liang Zheng said on the side.

"Senior brother, the 'Yin Vein' erupts from time to time, forming new 'Black Haze Poisonous Forests' everywhere, and after tens of millions of years, the entire Black and White Mountain Range should be eroded, right?" Liu Yu asked puzzled.

"Senior Brother Liu, you're really funny. Liang Zheng couldn't help laughing.

"Senior Brother Liu, don't be surprised, he just owes his mouth. He Anqing pinched Liang Zheng and said.

"Yin veins" erupt from the ground, like volcanic eruptions, mostly only temporarily, and the "black haze poisonous forest" formed lacks the replenishment of yin qi, and after months or years, it will naturally dissipate. Fang Lanlan said to Liu Yu.

The larger the scope of the "Black Haze Poisonous Forest", the slower it will dissipate, there are so many peerless places, there are often "Yin Veins" eruptions, forming a "Black Haze Poisonous Forest" that stretches for thousands of miles, which has existed for hundreds of thousands of years, and there are a large number of ghosts and monsters in it, which are extremely dangerous, and if Senior Brother Liu encounters them in the future, you must be careful. Liang Zheng took Fang Lanlan's words and said.