Twenty-five minutes later, Zhang Feng absorbed 5 medium-grade spirit stones in a row and successfully obtained 5 free points.

However, the efficiency is obviously much lower than before, because the previous 4 pieces got 10 free points.

At the beginning, 2 pieces are 3 points per 1, then 2 pieces are 2 points per 1 piece, and now these 5 pieces are only 1 point per 1 piece.

He wanted to continue the transformation, but he found that the ability had no response, and it was obvious that he had already reached the number of absorptions, and if he wanted to continue, he could only find a way to obtain a high-grade spirit stone.

However, Zhang Feng didn't have too much regrets, because these 9 medium-grade spirit stones added up to 15 free points for him, so much he was already very satisfied, without these free points, he would have been killed by the demon a long time ago.

In fact, if these fifteen points are full of strength, agility, or skills, it may not be impossible to directly kill the demon.

But he didn't know that he would encounter two powerful demons in a row today, and he couldn't complete the absorption in advance, and then he was chased and killed, and he didn't have enough time at all.

Fortunately, this is not bad now.

Upgrading formations and the like doesn't seem to be able to directly increase combat power, but in the long run, the benefits will be greater!

"Add 1 dot formation!"

Zhang Feng pressed the + sign behind the formation skill, and a large amount of information immediately appeared in his mind, and many obscure problems were easily solved, and many vague and uncertain knowledge points were instantly clear.

By the time he opened his eyes again, the formation had reached 12 points.

He looked at the formation on the ground again, and it was immediately clear at a glance, he originally felt that it was extremely profound, but now he found that there was no secret at all.

"I see!"

However, because of his understanding, Zhang Feng felt more and more that the predecessors of the formation were very powerful.

First of all, this formation was originally supposed to surpass the treasure level, but as the years passed, more runes on it had been erased by the sword qi demon qi and the years, so this formation would degenerate to the peak of the treasure level.

Fortunately, the sword qi and demon qi have also weakened a lot with the passage of time, so this formation is enough.

But to be able to arrange this formation, even if there are runes to dissipate, the formation will only reduce the level instead of collapse.

And to be able to calculate the speed of the degradation of this formation, to ensure that it is not faster than the speed of the weakening of the black qi, the predecessors of the array, the cultivation must be extremely high, and the formation attainment must be very terrifying.

By the standard of ability, I'm afraid I've already reached 13, 14, or even 15 and 16.

Zhang Feng didn't rush to make a move, but observed all over the neighborhood before stopping in front of a mountain wall on the left.

His formation attainments are enough, but his cultivation is too low, and this formation is too big, obviously not something he can deploy.

However, he could erase the small number of runes in this formation, then dig out the rocks in it, and quickly replenish new runes.

In this process, the speed must be fast enough to ensure that the formation as a whole is not affected, otherwise once the formation degrades, or even collapses as a whole, the black wind will not be suppressed, not only will he definitely die, but a large area in the vicinity will also be ruined and become a Jedi.

Fortunately, he was confident in the stability of this formation and his hand speed, took a deep breath, relaxed a little, moved his hands and feet again, and immediately began the actual operation.

Bang Bang Bang ......

His hands were extremely fast, and soon the few runes on the mountain wall were destroyed, and a fist-sized gap appeared.

But this gap immediately disrupted the balance, and the space in the valley shook violently, countless runes erupted with dazzling brilliance, and the black wind also went berserk.

The sky near the valley darkened in an instant, with dark clouds, lightning and thunder, and then a strong wind and a torrential downpour.

It looked as if the end of the world was coming, and the birds and beasts in the nearby mountains fled with wails.

Even the lurking demons and Zhou Qian were taken aback.

Although they didn't show their figures, they all looked at them with shocked faces, and they couldn't help but tense their bodies, and they were ready to flee for their lives in an instant.

In the valley, the gap in the formation expanded rapidly, and between breaths, it reached a radius of two meters, and then without Zhang Feng digging up the materials, the black wind nearby had already roared and rushed over on its own, and immediately rushed out of a deep cave on the mountain wall.

However, this gap did not further expand, because Zhang Feng had already added blockade lines to the surrounding formations in advance.

Whew......

As soon as the cave was completed, Zhang Feng had already taken advantage of the fact that the wind escape charm had not yet expired, and the ghost flashed, his hands clicked quickly, and one after another the true yuan was played, and many mysterious runes were formed, like chains, connected to the main body of the formation.

Fifteen minutes later, Zhang Feng had successfully repaired the formation.

At the same time, the air shook violently, and the black wind in the valley returned to its original state, and the surrounding air runes were hidden again.

The storm dissipated two hours later.

"What's the situation? Is it related to Zhang Feng's guy?"

Zhou Qian and the demon were both relieved, but they were also shocked.

Zhang Feng was sweating profusely, his face was pale, and he was extremely consumed, but his eyes were shining, and he was very satisfied and happy.

In front of him, there was a cave more than ten meters deep, and there were many broken rocks in the cave, which could be taken directly.

At the same time, the black wind in this cave is much gentler than in the valley, which is just enough to allow him to rest and cultivate.

There are also formation runes on the walls of the cave, so they are very stable and will not collapse, let alone be damaged and corroded by the black wind.

"It's cool. Originally, I was out and could support it for a few days at most, but here, I can support it for a longer time. Wait until I improve the Fulong Spear, and then practice well, if the demon is still there after I go out, hum ......"

Zhang Feng was very satisfied with this cave, and strengthened several layers of different spirit level peak defense formations at the entrance of the cave, and the black wind in this cave immediately weakened again, turning it into a temporary cave for him.

Then, Zhang Feng collected the gravel in the cave, and couldn't help but feel good, and found that he had really made a lot of money this time.

Because these gravel stones are dark and shiny, cold and heavy, all of them are refining materials, even if some of them are stones inside the mountain wall, it is not enough to be penetrated by the black wind, they are also the top grade of the spirit level, and the rest are the peak of the spirit level.

With so many spirit-level high-grade and top-grade refining materials, whether it is refining spiritual weapons and selling them again, or selling them directly, they can make him a fortune.

Especially, there are many such materials in this canyon!

Ordinary martial artists can't take it, even if it's an Earth Demon, or even a Tiangang master, he can't get it if he doesn't have enough formation attainments, but he has no problem at all!

"Fusion!"

After calming down his joy, Zhang Feng took some stones, put them together with the Fulong spear, stretched out his hands and used the fusion technique, and shook them one by one.

Soon, the stones turned into a liquid and fused evenly into the shaft and blade of the Fulong spear.

Some of the original low-level materials in the Fulong spear were all squeezed out, and they were soon reborn.

"Good!"

After the fusion, the spear was dark and shiny, and its appearance had not changed much, but Zhang Feng weighed and felt it and found that this spear contained terrifying power, and it was obviously heavier, colder, and sharper.

If you are an ordinary martial artist, even if you have the blessing of the True Yuan and the Spirit Array, you can't use this spear at all, but Zhang Feng is extremely powerful, and he uses it just right.

Bang Bang Bang ......

Subsequently, Zhang Feng began to modify the mid-grade spirit array on the spear, and carved a large number of new top-grade spirit arrays into it.