Dachuan Province is very mountainous. When driving from here to Kunlun Mountain, almost half of the journey is on mountain roads.

After driving this way, Su Xiaofan felt that he could definitely match the title of veteran driver.

For more than twenty hours, except for entering the service area to refuel, he was either on mountain roads or on highways.

Winter has now entered the Northwest, and heavy snow has fallen in the past few days. The mountain road up to Kunlun Mountain has been blocked by heavy snow.

Su Xiaofan had no choice but to leave the car in a hotel parking lot in a small county town at the foot of the mountain.

He didn't dare to park the car anywhere casually, after all, the bottle of gourd monkey wine in the car was priceless.

The night is as dark as ink, and the snow is as white as cotton.

Su Xiaofan and Tiger Cat left the county town one after another, leaving no trace in the white snow.

When we set foot on the Kunlun Mountains, the climate suddenly dropped to nearly 30 degrees below zero. Such a cold zone can definitely be called a forbidden zone for humans.

After spending more than two hours, Su Xiaofan entered the Grand Canyon where the death zone is located.

As soon as we entered the canyon, the biting cold wind disappeared.

Compared with the waist-deep ice and snow outside, the Grand Canyon is full of green grass and flowers are blooming, as if they are two completely different worlds.

Su Xiaofan didn't waste any time and walked directly to the depths of the canyon.

Su Xiaofan wanted to sneak in under the cover of night, get the Thunder Stone and exit before the giant ape could react.

When they arrived at Batur's former home, Su Xiaofan asked Duobao to stay. It had just been promoted to the extraordinary and was not yet able to hide its energy. It might be discovered once it entered the valley.

Su Xiaofan completely gathered all his breath into his body, and under the cover of night, he quietly sneaked into the death zone along the rock wall.

Sky Thunder Stone is not uncommon in the Death Zone. On the ground more than 300 meters away from the valley entrance, a huge stone weighing thousands of kilograms appeared in Su Xiaofan's repair system with the words Sky Thunder Stone.

But what made Su Xiaofan frown a little was that half of the boulder was buried underground. If he tried to take it out, he might cause thunder.

Slowly walking along the rock wall towards the valley, Su Xiaofan wanted to see more clearly, or look for the Thunder Stone that had broken out of the ground.

[Heavenly Thunder Stone: It is a weapon refining material and can be purified. It needs to deduct 300 points of repair value. Do you want to purify it? 】

"What the hell, what option is this?"

When Su Xiaofan came to a place only ten meters away from the huge thunder stone, a message that had never appeared before suddenly appeared in his mind.

"The techniques can be cultivated, the materials can be purified, and besides giving birth to children, is there anything else that can't be done to repair the system?"

Even Su Xiaofan himself couldn't help but complain. The repair system in his mind was like an intelligent creature, making many adjustments according to Su Xiaofan's needs.

Just like the repair of skills, the system can actually do it, but it only provides a nurturing function.

The existence of the accumulation pool allowed Su Xiaofan to greatly reduce the loss of repair value.

Moreover, when cultivating the skills, it can make his foundation extremely strong, rather than directly repairing it overnight. If it could be scored, Su Xiaofan would definitely give it a five-star rating.

"Is it because I have learned the art of refining that the option of purification appears?"

Su Xiaofan thought in his mind, in fact, the last time the Heavenly Thunder Bamboo nourished, it showed the effect of purification. This time, he simply changed the word "accumulate" to "purify".

“Got to try it!”

Su Xiaofan did not choose to purify rashly, but released his spiritual consciousness and observed the surrounding caves. He had to find an escape route in advance and hide.

"Huh? Is the red fox's burrow empty?"

Su Xiaofan discovered that more than a hundred meters ahead, there was a fox cave that had been penetrated by a giant ape before. There was no creature hiding in it.

Su Xiaofan came to the Thunder Stone quietly, put his palm on it, and silently said "Purify!"

Just when Su Xiaofan confirmed the purification, the boulder under his palm suddenly disappeared, revealing a two-meter square hole on the ground.

At the same time, Su Xiaofan shuddered, and a huge sense of crisis came from above his body. In the thick clouds above Devil's Valley, lightning began to flash.

Before the first lightning struck, Su Xiaofan slipped into the fox's cave and pulled down a few thunder vines and placed them at the entrance of the cave.

Almost at the same time that Su Xiaofan entered the cave, countless thunderbolts formed a thunder net, overwhelmingly covering the entire Devil's Valley.

The whining sounds of the animals were buried in the thunder. Su Xiaofan's operation caused countless creatures in the restricted area to die in the thunder sea.

Only then did Su Xiaofan have time to check the information in his mind.

[Repair value: 3000 points!]

[Heavenly Thunder Stone: Material for refining equipment, being purified, countdown to 11:59:59...]

"Fortunately, it didn't take long..."

Seeing the purification time, Su Xiaofan breathed a sigh of relief.

According to what is said in the weapon refining technique, to refine a flying sword requires at least two kilograms of weapon refining materials purified from the Sky Thunder Stone.

And Su Xiaofan didn't know how much this huge stone could be purified. If it wasn't enough, he would have to continue looking for the Thunder Stone to purify it.

The thunder outside raged for about twenty minutes. The moment the thunder disappeared, Su Xiaofan's figure left the Devil's Valley.

Sure enough, less than a minute after Su Xiaofan left the Devil's Valley, the huge body of the giant ape appeared at the entrance of the valley.

Looking around with some doubts, the giant ape twitched its huge nose from time to time, and a puzzled expression appeared on the giant ape's face.

"Small, I've suffered a loss once, but you can still smell it?"

Su Xiaofan, who was hiding a few hundred meters away from the valley entrance, smiled proudly.

The fox smelled it last time. Before coming this time, Su Xiaofan prepared a bottle of deodorant. It seems that technological products are not useless in the restricted area.

After taking a look at the giant ape, Su Xiaofan quietly left the entrance to the restricted area and returned to the Batur family's wooden house.

Seeing Su Xiaofan coming back, Duobao came up to him excitedly and roared a few times in the direction of Devil's Valley.

"Come on, we are not here to fight. Let's get the Sky Thunder Stone first and then come back to cause trouble for it."

Su Xiaofan had fought against the giant ape, and he knew that with Duobao's current level of evolution, there was a high probability that he would not be the opponent of the giant ape.

Of course, it would be difficult for the giant ape to hurt Duobao, because Duobao's current speed is so fast that it is almost like teleporting within a short distance, and Su Xiaofan cannot keep up with its speed.

After rubbing Duobao's neck, Su Xiaofan took it into the woodshed to rest.

Su Xiaofan drove 2,000 kilometers in the past two days and went to the restricted area non-stop to collect a piece of thunder stone. He also felt a little tired mentally.

More than ten hours later, Su Xiaofan opened his eyes while meditating and looked at a piece of metal in his palm.

[Thunder Gold: a weapon refining material, cannot be cultivated, cannot be repaired!]

After seeing the information in his mind, Su Xiaofan realized that the material purified from the Sky Thunder Stone is called Thunder Gold, which is also the main material that the ancestor said was used to refine the natal flying sword.

However, the piece of Thunder Gold Essence in Su Xiaofan's hand was only about four taels at most, and it was still far behind if he wanted to refine a flying sword.

"Damn it, it took a ton of thunder stone to purify four taels of thunder gold essence. Doesn't it mean that it has to be purified five times to get enough materials?"

Su Xiaofan felt that his ancestor was a bit cheated. If he purified it four more times, he would consume at least 1,200 points of repair value. Half of the repair value he had finally accumulated would be lost in one fell swoop.

"The ancestor said that the flying sword made from this thing is unparalleled in speed and has the power of thunder!"

Su Xiaofan released his spiritual consciousness and carefully examined the Thunder Gold Essence in his hand. However, as soon as it came into contact with the Thunder Gold Essence, a flash of lightning flashed and Su Xiaofan's consciousness was ejected.

"It should be a good thing, but it's a little expensive to repair!" Su Xiaofan put the Thunder Gold Essence away. He still needed four pieces of this size.

"Try to find a bigger Thunder Stone next time and see if it also consumes 300 repair points."

Su Xiaofan made up his mind to save whatever he could, because the repair value was really difficult to get.

If he hadn't used the energy of the starry sky to fool Uncle Lu'an into helping him, if he had relied on Su Xiaofan himself, he might not even be able to collect a thousand repair points.

"Wait for me here while I go into the valley to have a look." Su Xiaofan stood up and was about to leave when a burst of thunder came from his ears.

"I didn't trigger this."

Looking at the scene in the distance that was like a thunderstorm destroying the world, Su Xiaofan smiled bitterly. He could only wait for the thunder to dissipate before going in.

The giant ape seemed to have a strong and stubborn awareness of the restricted territory. After the thunder disappeared, its huge body patrolled the outer areas of the restricted area again.

However, this reassured Su Xiaofan a lot. At least the giant ape was doing a routine operation and did not discover his trace.

After waiting for more than half an hour, after the giant ape completely disappeared, Su Xiaofan quietly sneaked into the restricted area.

Devil's Valley is relatively quiet during the day, and most of the animals that come out are herbivores, while predators usually start to be active at night.

Before entering the valley, Su Xiaofan sprayed deodorant again to control the breath all over his body. His body clung to the rock wall, like a lifeless stone, and he slowly moved deeper into the restricted area.

Su Xiaofan encountered several thunder stones on the way, but they were all too small.

The largest piece weighed only seven or eight hundred kilograms, and the smallest piece was only about the size of a palm. Su Xiaofan didn't even bother to pick it up.

The Sky Thunder Stone is actually very easy to identify. It has been hit by lightning all year round, and no grass grows on the Sky Thunder Stone. Moreover, with the naked eye, you can vaguely see the faint flash of lightning in the stone.

I don't know if it was due to being electromagnetized by thunder. The original minerals in the Thunder Stone formed fine gold, but the quantity was very small. Only a ton of Thunder Stone can extract a few cars of fine gold.

Su Xiaofan now also understands why Thunder Gold Essence is suitable for refining flying swords, but no one uses it.

It is really difficult to obtain the thunder stone. A stone weighing one or two tons will be struck by lightning as soon as it is moved.

Fortunately, it was at the entrance to the restricted area. With Su Xiaofan's speed, he could move out with the Thunder Stone.

But as he went deeper into the restricted area, Su Xiaofan was unable to carry a stone weighing one or two tons and rush out of the valley.

If there wasn't a repair system, the Sky Thunder Stone could be directly put into the system for purification. Su Xiaofan couldn't think of any good way to take the Sky Thunder Stone out.
To be continued...