Half a month later.

On the edge of the Gaishan country, near a valley in the empty mulberry demon forest, looking around, the valley is almost covered with a demon tree with red branches and cyan leaves, this demon tree is called Zhumu, and this valley is called Zhumu Demon Valley.

In the depths of the Vermilion Wood Demon Valley, on top of one of the tall vermilion trees, Xue Lingying was quietly meditating on his knees, as early as two days ago, Xue Lingying and Yan Tian had come to the Vermilion Wood Demon Valley, and after searching around to no avail, the two were waiting for Xue Lingshuang and the others to arrive here.

After another stick of incense.

Xue Lingying, who was meditating cross-legged, suddenly opened his eyes slightly, then smiled slightly, his figure flashed, and in the next moment, he was already standing in mid-air, and in front of Xue Lingying, three rays of light lit up out of thin air.

The light appeared suddenly, and it dissipated quickly, and in the air in front of Xue Lingying, there were already three more women, who were Xue Lingshuang, Li Yun'er and Wu Xixuan, who had just arrived here.

Prior to this, Xue Lingshuang and the other three searched the entire Gaishan City, and the three of them, including Ji Ji, Wo Xinlei and Li Huaidie, also inquired around, but found no trace of Xue Aohai, so Xue Lingshuang and the other three did not continue to stay, and rushed straight to the Zhumu Demon Valley.

In Gaishan City, there is a teleportation formation, through which you can teleport to a flight distance of less than half a day from the Vermilion Wood Demon Valley, so it only took Xue Lingshuang and the other three people half a day to come from Gaishan City to the Vermilion Wood Demon Valley.

After a brief conversation, Xue Lingshuang and the other four flew straight to the Empty Mulberry Demon Forest.

"Boom!"

The roar of the rushing water filled the air.

In front of me, a wide and strange mountain stream, said that it is strange, just because although this mountain stream is only more than 1,000 zhang wide, but it winds and stretches without knowing its length, and I don't know where its source is, only know that the water of this mountain stream is rushing down from the mountain.

What's even more strange is that it is only a mountain stream of more than 1,000 zhang wide, but it is formed two halves of Jingwei, the water of half of the mountain stream in the east is like boiling, it is hot and unbearable, and the water of half of the mountain stream on the west side is cold and misty, and it is extremely cold, this mountain stream is called the cold and summer boundary river.

The so-called boundary is also the meaning of demarcation.

Immediately on the east and west banks of the Cold and Summer Boundary River, there are two equally hot and cold mountains, although these two high mountains stand across the river, but as long as you take a closer look, you will be surprised to find that these two high mountains seem to be split by the same mountain, and the person who divides the mountains seems to be the Cold and Summer Boundary River.

The high mountain in the east burns all the year round, and the heat wave rolls, but the flames in the mountain neither spread nor extinguish, and is called the Curtain Flame Mountain, and the high mountain in the west is covered with ice all the year round, and the snowflakes are flying, and the cold fog in the mountain is full but does not cross the river for half a minute, and its name is Wet Mountain.

However, in Xikui Lingzhou, there are quite a few people, especially the demon clans in the Empty Mulberry Demon Forest, who are more accustomed to calling the Curtain Flame Mountain and the Wet Mountain together as Buzhou Negative Mountain!

In ancient times, its high Zhouzhizi Mountain has not yet broken apart, because it is tall and broad, so Buzhouzhizi Mountain has become a natural barrier of the empty mulberry demon forest.

And the Qingsang Demon Sect, which is entrenched in the deepest part of the Empty Mulberry Demon Forest, has the longest inheritance and the most powerful strength, together with the many small sects and families of the demon clan in the Empty Mulberry Demon Forest, relying on the natural danger of Buzhou Negative Mountain, has attacked and retreated countless times, so that disputes continue and corpses are everywhere.

Later, Wuluo Holy Ancestor was alone and personally came to the Kongsang Demon Forest, just at the foot of Buzhou Negative Mountain, and the sect master of the Qingsang Demon Sect and its hundreds of elders at that time, as well as more than a thousand strong people from the rest of the demon clan's sects and families, fought fiercely, which lasted for a full seven hundred and forty-nine days.

In that battle, the powerhouses of the Kongsang Demon Forest were almost wiped out, leaving only the Sect Master of the Qingsang Demon Sect and its three elders who could retain the body of the primordial gods, and less than ten remaining powerhouses of the Demon Clan.

It was precisely because of that battle that the originally huge Buzhou Negative Mountain was broken into two halves!

Subsequently, the Wuluo Holy Ancestor and the Sect Master of the Qingsang Demon Sect at that time, as well as the remaining more than ten strong men, actually stopped fighting, but did not know what kind of agreement they reached, and each of them exerted great magical powers, and turned the broken Buzhou Negative Mountain into the Curtain Flame Mountain, the Wet Mountain and the Cold and Summer Boundary River that have been handed down to this day.

It was also at that time that there was an iron rule that has been passed down since ancient times in Xikui Lingzhou: with the Curtain Flame Mountain, the Wet Mountain and the Cold and Summer Boundary River as the boundary, the Midu Demon Sect and the Qingsang Demon Sect divided and ruled, and they did not invade each other, just like the flames and cold ice of the two mountains, but they were no longer hostile to each other, just like the cold and summer boundary rivers where cold and summer coexisted.

The Curtain Flame Mountain and the Wet Mountain were both because of the steepness of the mountains, and because the power of the flames and ice of the two mountains was extremely amazing, it was almost impossible to cross or fly through the mountains unless they were strong people in the early stage of the Demon Infant and above.

And the cold and summer boundary river, the power of the flames and ice of the river is no less than that of the curtain flame mountain and the wet mountain, in the river surface and above it, it has formed a shadowless and invisible and amazingly powerful, like a transparent light curtain like a cold and heat barrier, below the early stage of the demon baby, since then.

Of course, the Secret Demon Sect and the Empty Mulberry Demon Forest, as long as they have unique tokens or communication talismans, they can pass through the cold and heat barrier at will.

At this moment, in mid-air, Xue Lingshuang, Xue Lingying, Li Yun'er and Wu Xixuan flew up, looking at the cold and summer realm river in front of them, and in their respective spiritual senses, they naturally sensed and saw the cold and heat barrier that could not be seen by the naked eye.

"Boom!"

A dazzling sword light appeared out of thin air, and it shone rapidly, accompanied by the sword light, there were actually black winds like thousands of spears, flames like dancing golden snakes, water waves like giant turtles cracking the sea, and sand like a demon bear in the mountains, the momentum can be described as shocking.

Sword light, black wind, flames, water waves, and sand and soil slammed together on the cold and heat barrier, and the originally shadowless and invisible cold and heat barrier immediately appeared, and the roar started, but the cold and summer barrier was only a slight flickering and circulating demon light, not moving.

"Sure enough, it lives up to its name!"

Wu Xixuan looked at the immovable cold and heat barrier, but smiled slightly, and as soon as the words fell, the terrifying sword light, black wind, flames, water waves and sand and soil all dissipated in an instant, and then in the air in front of Wu Xixuan, the sword light flashed, and a long sword was suspended.

This long sword is actually two feet long and four feet long, the shape is simple, the whole body is cyan, the cyan sword is constantly swallowing and sweeping, and the demonic aura it exudes is actually chilling, it is a high-grade spiritual treasure, its name: Haoji Four Trillion Sword!

The Haoji Four Trillion Sword is one of the many treasures that Wu Xixuan has now, and in terms of its fierceness and power, the Haoji Four Trillion Sword should be the leader.

Wu Xixuan's spiritual sense moved, and the sword light of the Haoji Four Trillion Sword suspended in front of him flickered, quickly shrank, and then flew back to Wu Xixuan's body.

Wu Xixuan, like Xue Lingshuang, Xue Lingying and Li Yun'er, came to the Empty Mulberry Demon Forest for the first time, and she had already heard of the prestigious Buzhou Negative Mountain and the cold and summer barrier.

Not long ago, Wu Xixuan also wanted to try this cold and heat barrier on a whim, so he sacrificed the Haoji Four Trillion Sword and slashed it suddenly.

Wu Xixuan's spiritual sense moved again, and immediately an extra communication talisman shaped like a cyan leaf appeared in his hand, and Wu Xixuan was about to cast a spell to activate the teleportation talisman in his hand.

"Xiaoxuan, wait!"