In these three months, Tang Feng not only experienced two months of torture training, but also spent more than twenty days overseas, and this period of experience made the meridians and dantian in his body extremely thirsty for energy filling, and when he cultivated in the sixth room of ice and fire for about ten days, he could naturally be promoted.

Tang Feng still remembered that in his own realm, except for the more than 2,000 people who had poisoned the Giant Sword Gate in Tianxiu at the beginning, and had gone from the eighth grade of refining Gang to the upper grade of the Yellow Rank, the remaining stages were all climbed up step by step with the flow.

He was injured by the Howling Wolf in Quting Mountain, chased and killed by spirit beasts, hid in the beast tomb to heal his injuries, and was promoted from the upper grade of the Yellow Order to the lower grade of the Xuan Rank, which took more than two months.

It also took two or three months to make a big fuss on the side of the Giant Sword Gate, hide in Oolong Castle, and inadvertently promote from the lower grade to the middle grade of the Xuan rank by the seaside.

And this promotion is more than three months long.

It can be said that every promotion is not something that Tang Feng can predict, and he didn't feel anything before, he has always worked hard and worked hard...... Then it came naturally, and it broke through naturally.

On average, two or three months to be promoted to a product, although this speed is faster than ordinary people, but compared with others, Tang Feng appeared before refining Gangxin Yipin, this qualification is simply not surpassed, Gangxin appears The earlier the qualification, the faster the cultivation speed, this is the law of cultivators, and no one can change it.

Therefore, Tang Feng will not worry about whether he will have an unstable foundation or something like that, if he can be promoted every ten days, that is what makes people worry.

Sensing that he was about to break through the existing realm, Tang Feng didn't have much emotional fluctuations, in the end, the breakthrough of the Xuan Rank was not very helpful to him, the breakthrough that Tang Feng needed was the breakthrough of the impermanence technique, and the ability brought by the breakthrough of each impermanence trick was what Tang Feng was looking forward to the most.

But the breakthrough of the impermanence formula is not such a simple thing, the second layer of the impermanence formula is broken through when refining the six grades of Gang, and the third layer of the impermanence formula is broken through around the middle grade of the yellow level, and the specific Tang Feng is not known at that stage, according to this calculation, the fourth layer of the impermanence formula must be around the ground level.

His mind was not wavering, his expression was not sad or happy, Tang Feng still used the exercises, resisting the two forces of ice and fire that eroded him. The beating of the little skeleton in the dantian became more and more powerful, and the agitation frequency of the Gang Qi in the meridians also accelerated a lot.

Faintly, it seems that there is an invisible barrier blocking his meridians, blocking the circulation of Gang Qi, making people feel some pain in their meridians.

Tang Feng didn't care, he just ran the impermanence technique, urging the Gang Qi in his body to resist the ice and fire.

When the small skeletons in the dantian and the Gang Qi in the meridians beat to a certain frequency, the whole person suddenly relaxed, and the barrier blocking the circulation of Gang Qi in the meridians was suddenly opened, and the Gang Qi flowed unimpeded in the meridians, and the dantian contracted violently.

At this moment, the two forces of ice and fire also alternated at the same moment, and the new ice energy quickly devoured and neutralized the fire energy, turning into a huge and pure chaotic aura, which was precipitated in Tang Feng's meridians and body.

In the depths of his heart, there was a violent sound of agitation, Tang Feng closed his eyes and looked at it, only to see that the color of the little skeleton in the dantian had quickly changed from black to white, and the countless ghosts on the skeleton that glowed with a little green light were also rejoicing like fireflies at this moment, gathering into a torrent, dancing around the little skeleton.

At the same time, a large stream of information was conveyed into Tang Feng's mind.

Tang Feng couldn't help but be stunned, and even forgot to continue his exercises. Fortunately, the operation of the third layer of the Impermanence Technique no longer needs to be promoted by himself, even if he does not use his luck, in this state, the Impermanence Technique is still running continuously, and the extremely pure Gang Qi in his body is also repeating itself.

Gradually, the beating of the heart and meridians stopped, and the countless yin spirits surrounding the little skeleton also stabilized, slowly covering the skeleton of the little skeleton, and the little skeleton at this moment became the same as a long time ago, white as jade, and the root bones were like newborn babies, exuding a tender luster.

This was completely out of Tang Feng's previous judgment, and Tang Feng had thought that the promotion of the fourth layer of the Impermanence Technique could only be completed at the ground level.

But now, he has not only been promoted to the top grade of the Xuan Rank, but he has also completed the breakthrough of the fourth layer of the Impermanence Technique.

The information in his mind was the exercise route and the accompanying abilities after being promoted to the fourth layer, but Tang Feng didn't have time to check it yet.

Even if he didn't expect this kind of thing to happen, Tang Feng was overjoyed at this moment, and quickly interrupted his cultivation in the sixth room of ice and fire, sealed his own qi points, and prevented the pure aura from pouring in again, and slowly stood up and walked outside.

Tang Feng needed to take a good look at the movement route of the fourth layer of the Impermanence Technique and the ability he had obtained from this promotion. It is naturally inconvenient to be in the harsh environment of the thirty-sixth room of ice and fire, and the only way to do it is to go outside.

It had been several days since he saw the light of day, and when Tang Feng walked out of the cave again, he had an illusion of returning to the world, and the dazzling light outside also made him squint his eyes, and it took a long time to ease up.

"Brother Feng, are you going to rest?" Ling Tiyan hadn't said a word to Tang Feng for more than ten days, and when he stopped cultivating at this moment, he dared to ask.

"It's not. Tang Feng had a smile on the corner of his mouth and an excited expression, "Brother, I broke through." ”

"Wow, that's fast. Ling Timid Yan was amazed, although she had noticed it just now, she still deliberately praised Tang Feng, in order to say a word or two.

"Not only did I break through to the top of the Xuan Rank, but my exercises also broke through to the fourth layer. Tang Feng looked sullen, wishing that the more people knew about this matter, the better.

"By the way, what kind of exercises are you practicing?" Although Ling Tiyan could grasp Tang Feng's exercise route, he had never seen that kind of weird exercise method, let alone what kind of exercise it was, and the Gangxin who prompted Tang Feng to be born was a little skeleton.

"The name of this exercise is the Trick of Impermanence. Tang Feng explained, "Every time I break through the first layer, the next layer of the exercise route will automatically be conveyed into my mind, so before I break through, I can't get a full picture of it, I can only cross the river by feeling the stones." ”

"Seal?" Ling's timid tone was a little surprised, "Could it be that this kind of exercise is sealed in your mind by a master? Only when the strength is reached, the seal can be automatically unlocked, so that you can understand what to do next." ”

"Let's just say that. Tang Feng nodded.

"This master must be very powerful. Ling Timid Yan exclaimed.

"I don't know, I haven't fought him. But all my strange abilities are brought about by this exercise, and it can even be said that my heart was born because of this exercise. "It's been almost a year, and Tang Feng can also know that his abilities born from the impermanence trick are inseparable from his own Gang Heart, whether it is the Phantom Space or borrowing the corpse to resurrect the soul, you need to use the Yin Soul in Gang Heart, if you don't have this Gang Heart, where can the Yin Soul be used? Without the Yin Soul, how can those abilities be used?

This is probably the fundamental reason why Gangxin appeared before refining Gangyipin. Ten years of ghost and god cultivation, not only shaped his own meridians into solid gold, but also shaped a small skeleton in his dantian, of course, this is just Tang Feng's speculation.

The second layer of the impermanence trick allows himself to have a phantom space, the third layer allows himself to borrow a corpse to resurrect his soul, what can the fourth layer have? Although he couldn't wait to know in his heart, Tang Feng still held back and didn't check it, he needed to find a better environment, take a closer look, and ponder.

Running all the way to the foot of the mountain, to the edge of the forest with strange fruits, Tang Feng stopped, this is neither hot nor cold, it is a good place to rest, and it is not easy to be affected by the strange climate of Ice and Fire Island.

Sitting cross-legged, Tang Feng closed his eyes and concentrated, and first checked the exercises and exercise routes of the fourth layer of the Impermanence Technique.

Like the previous two times, there have been some slight changes in the fourth-level exercise route, but this has not had much impact, and it only needs to change the previous exercise habits and slightly change the movement route of the third layer. Tang Feng estimated that it would only take him a day to get acquainted.

What follows is the highlight of this promotion.

Tang Feng suppressed his excitement, mobilized another string of information, and carefully recalled it in his mind.

But at a glance, Tang Feng couldn't help but be a little disappointed, because the ability to promote to the fourth layer of the Impermanence Technique had no effect on the battle, so to speak, it would not bring any increased combat power to himself at all, and it was not comparable to borrowing corpses to resurrect souls.

Borrowing the corpse to resurrect the soul is the ability to borrow the Yin Soul in Gangxin, how strong the Yin Soul was before his death, then how strong the power that Tang Feng borrowed, he only used the Resurrection of the Corpse twice, and all the borrowed were the bloodless Yin Soul on the front side of the Giant Sword Gate, although the sequelae were serious and unbearable, and it would take at least a few days to slowly ease up after using it, but it was undeniable that the ability to borrow the corpse to resurrect the soul was still quite powerful, which could make Tang Feng turn the danger into a disaster and seek a way to survive in adversity.

If he didn't have this ability, Tang Feng would have died twice.

Originally, Tang Feng was looking forward to whether the ability brought by being promoted to the fourth layer would be a little more powerful than borrowing corpses to resurrect souls, but when he learned the truth, he was a little lost in his heart.

Sure enough, the greater the expectation, the greater the disappointment!

Sensing the change in Tang Feng's mood, Ling Timid Yan asked, "What's wrong?"

Tang Feng smiled bitterly: "The ability I got this time seems to be a bit chicken." But if you think about it, it seems to have a lot of functions. ”

"Brother Feng, your expectations are too high, right?" Ling Timid Yan pointed out the problem pointedly.

"Yes. Tang Feng admitted calmly.