On the periphery of the Demon Beast Mountain Range, the active Demon Beasts are all relatively low-level, so Lin An and Nalan Yanran are too lazy to waste time with these Demon Beasts.

In less than ten days, Lin An and Nalan Yanran had already gone deep into the Demonic Beast Mountain Range, and all the demonic beasts they could encounter here were about fourth-order Demonic Beasts, which were equivalent to the masters of Fighting Spirits among human beings.

Although Nalan Yanran's talent is good, it is definitely not as fast as Lin An's promotion speed, and he is only an eight-star fighter at this time.

If she hadn't been very confident in Lin An's strength, I'm afraid she wouldn't have chosen to go deep into the Demon Beast Mountain Range so quickly.

Although I have also encountered human mercenary groups along the way, I have no intersection with them, and I haven't even said a word.

"Senior brother, it's not too late, why don't you rest here tonight!" Nalan Yanran said.

Lin An saw that the sky had gradually darkened, and if he continued to go deeper, he might encounter more dangers, so he agreed with Nalan Yanran's opinion.

After a long journey in the past few days, both of them are a little tired.

"Roar..."

However, before Lin An's words were finished, a low beast roar was heard not far away.

Seeing this, Nalan Yanran's expression immediately tensed.

It was a fourth-order Demonic Beast Swift Wind Leopard, the fastest Demonic Beast in the Demonic Beast Mountain Range, and at the same time, its claws were also very sharp, and ordinary Nine-Star Fighting Spirits would not dare to regret its claws.

"It's not good, it's a fourth-order swift wind leopard!" Nalan said solemnly.

"Don't worry, senior sister, I'll take care of it, you find a place to hide first!"

Lin An was interested, he had long wanted to find an opponent to practice, this swift wind leopard... It's a good opponent.

"Then junior brother, you have to be careful, if you are not defeated, don't resist hard, it is important to save your life!"

Before Nalan Yanran's words were finished, with a low roar, the swift wind leopard turned into a streamer and pounced towards Lin An.

The IQ of the Swift Wind Leopard is not low, it can sense the threat emanating from Lin An, as long as it solves him, the other human is not its opponent at all.

Seeing this, Lin An also rushed forward as soon as possible.

"Wind Wolf Seal!"

The fighting spirit quickly condensed on Lin An's palm, and in the middle of his breath, he had already turned into a wolf phantom, and directly collided with the swift wind leopard.

Boom~

In the next moment, an astonishing storm of energy spread from between the two of them in all directions, setting off a strong gust of wind.

Nalan Yanran hurriedly retreated, she knew that staying here would only distract her junior brother and hide her position, so that her junior brother could deal with this swift wind leopard with peace of mind.

"Hahaha..."

"What a battle it's been a long time coming!"

Lin An's strength was on par with the swift wind leopard, and a huge force rushed into Lin An's body frantically along his arm, not only did it not hurt Lin An, but this power caused resonance in Lin An's body.

The limbs and bones were shaking as if they had been baptized at this moment.

Lin An could even clearly feel that his physical body had also been strengthened.

The swift wind leopard couldn't strike a blow, and retreated seven or eight meters away from Lin An, looking at Lin An vigilantly.

The power of the human being in front of it is beyond its expectations, but it is obviously impossible to make it give up if it is like this.

Let out a low roar, the wind blades quickly condensed in front of it, and the wind blades released strong fluctuations, and even the space under this wind blade appeared ripples, as if it had the ability to cut through space.

Whoosh~

Immediately after, dozens of pale cyan wind blades swept through the space and attacked towards Lin An.

Lin An didn't speak, but used his body technique, leaving directly from the same place, and when he reappeared, he was already above the Swift Wind Leopard, and a punch fell directly on the back of the Swift Wind Leopard.

The huge force directly knocked it several meters away, slammed it into an ancient tree, and let out a wail.

Soon, the swift wind leopard got up from the ground, his hair standing on end, and his eyes were red and he looked at Lin An.

Obviously, Lin An had completely provoked it.

Bang bang bang~

The strength of the swift wind leopard has obviously increased a lot, and with every collision, Lin An can feel that its power has become extremely powerful.

However, Lin An's ascension was not inferior to it in any way, and he could feel obvious progress every time.

To be honest, if Lin An was willing, he could easily kill him, but Lin An didn't do it.

He wanted to use this demonic beast to refine his body.

The battle lasted for a full hour, and Lin An became more and more energetic and powerful the older he became.

On the contrary, it is a swift wind wolf, and at this time it has already shown tiredness.

It didn't expect that the endurance and physical strength of human beings would be even stronger and more durable than it.

I already have the intention of retreating in my heart.

But how could Lin An, who was in the middle of the battle, let go of the opponent who had just appeared with great difficulty, not to mention, he planned to use it as his own food tonight!

Lin An found the opportunity and rode directly on the back of the wind leopard, and landed on the head of the wind leopard one after another.

Click...

It didn't take long for the sound of bones shattering to be heard clearly.... Directly swift wind wolf was killed by Lin An.

"Senior sister, I have solved it, you can come out!"

Lin An carried the corpse of the swift wind leopard and called out to Nalan Yanran, who was hiding.

"Senior brother, you really surprised me again, I didn't expect that the fourth-order demonic beasts could be killed by you!"

Nalan Yanran had already stood aside a long time ago, looking at the battle in front of her in horror.

If at the beginning, it was still a close battle, then the next ten minutes were beaten by Lin Andang.

"Even if this swift wind leopard is unlucky, it just happened to meet us!"

Lin An is also telling the truth, if there is no absolute crushing strength, the average mercenary group will basically choose to retreat when they see it, and they will not think about killing it at all.

After all, in the Demon Beast Mountain Range, the fourth-order Demon Beast was still quite tricky.

Bang Bang Bang ....

"The two of them are really impressive, I didn't expect that at such a young age, they have such terrifying strength, and even the fourth-order demonic beasts can be defeated so easily."

At this moment, two middle-aged people flew down from the ancient tree in the distance, looking at Lin An in front of them with a sigh on their faces.

"Who are you?"

Lin An asked vigilantly.

I secretly said in my heart that I was too careless, but I didn't expect that there were people watching the battle all the time but I didn't find any trace of them.

"Mo Feng, the head of the Lower Lion Mercenary Group, this is Xu Wen, the deputy head of our mercenary group, I am also very surprised to see the combat effectiveness shown by this little brother today!"

Mo Feng said with a smile, giving people an elegant and easy-going feeling, but Lin An smelled a hint of danger from him.

These two... It's not easy!