Half a month later, due to the continuous killing of a large number of demons, Li Fei and the others obtained countless demon cores, mainly at the level of the demon king, and there were also hundreds of demon lords! However, Li Fei and the others were also injured, and the mana consumption was extremely serious, if it were not for the support of a large number of pills provided by Li, they would have been unable to withstand it for a long time.

Later, perhaps because they were afraid of killing that demon clan, or maybe it was for other reasons, Li Fei and the others finally escaped from the scope of pursuit and came to a relatively calm area, where there were no powerful demons within a radius of hundreds of thousands of miles, and everyone decided to take a good rest.

It took more than half a month for everyone to fully recover. Li Fei thought about it for a moment, took out the top-grade Wang Jie Dan and handed it to everyone, so that everyone could try to break through on the spot.

Mi Fan excitedly took Wang Jiedan, and said with some concern: "We break through here, if we attract a powerful demon clan, it will be miserable." ”

Li Fei said: "Due to running all the way, we have already lost our way, and judging from the intensity of the demonic qi, I think it must be deeper, if we don't have enough strength, if we want to get out, I'm afraid it will be difficult, so we can only take a risk." ”

Although everyone felt that it was dangerous to break through here, they thought that Li Fei was right, because in these days of fighting, they felt that their own strength was seriously insufficient, and if Li Fei hadn't exerted his might, they would have been wiped out a long time ago.

After some preparations, everyone set up a huge formation within thousands of miles to cover up the movement that might be caused by the breakthrough, and then Xiang Cheng and the others began to take the Wang Jiedan breakthrough, and Li Fei found a small mountain col to study the secret of the magic core.

Because Li Fei had too little communication with the monks in Baisha City, he didn't know the purpose of the demon core, so he tossed around for a long time and didn't understand how to use it.

Since Hua'er had just broken through the boundary formation period, she didn't need to break through the bottleneck, seeing that Li Fei was studying the magic core, it seemed that she wanted to directly use the energy of the magic core, so she came to him and sat down, and said with a smile: "Brother Fei, the energy of the demon core is very powerful, and even the demon core is much stronger, and it has many uses, it can be used for refining weapons, it can also be used to set up arrays, etc., but it generally cannot be directly absorbed." ”

Li Fei saw that Hua'er exuded infinite charm when she smiled, and immediately woke up somewhere in her body, and said with a wry smile with some embarrassment: "Baby, you better return to your original appearance, otherwise it will be very hard for me to get along with you like this!"

Hua'er covered her mouth and smiled, her devilish body trembled slightly, stimulating Li Fei's nerves more intensely, and at the same time she said faintly: "Why do you want to endure it? Didn't you think about it a long time ago......

Li Fei let out a low roar, casually laid down a shield and prohibition, hugged the flowers in his arms, blocked her cherry mouth with a big mouth, and skillfully explored one secret place after another with both hands, and the two soon entered the world of infinite happiness......

After a long time, even Xiang Cheng and the others had passed the most dangerous time of movement, and Li Fei and Hua'er slowly stopped their extremely joyful "double cultivation" journey.

When Li Fei was about to ask about the secret of the magic core, Hua'er was still immersed in happiness, and whispered a little proudly: "Now Yue'er should call me sister, because she hasn't ...... with Brother Fei yet."

Li Fei, who had a big headache, almost had to "fight" with her again, but considering the dangerous environment, he didn't want to waste any more time, so he kissed him gently and asked: "Hua'er, what do you mean when you just said that you can't use the magic core directly? That is, it is possible to use it directly? There are just some restrictions, right?"

Hua'er crooked in Li Fei's arms, and replied casually: "The essence of the demon core is very strong, but it is very domineering, unless you advance to the domain transformation stage, use the power of the domain to slowly purify it first, and then enter the realm, you can directly absorb a little bit, and most of it will be wasted, and it is not even comparable to the normal cultivation speed." Otherwise, the 'realm' will be demonized, and the monk will become a demon. ”

Li Fei didn't say a word, released the green enchantment, and decided to give it a try, he didn't dare to test the demon core of the Demon Venerable, but took out a demon core of the early stage of the Demon King for experiments.

A demon core the size of a child's fist floated in the green enchantment, and countless green threads wound up, trying to destroy the thick demonic qi and leave pure energy.

But unfortunately, after most of the hour, the energy of the demon core was almost consumed, and there were even cracks on the demon core, and there was still no sign of purification, which means that Li Fei failed.

Hua'er seemed to have known that this was the result, and said indifferently: "Brother Fei doesn't need to try, if it can be used, so many predecessors in the past would have been on it a long time ago." Where is it still necessary to cultivate little by little? Cultivation is not a thousand miles a day!"

Li Fei smiled bitterly: "It's not that I haven't tried it, I want to test it myself, it seems that I am no exception, it is impossible to take shortcuts...... Hey, the green silk seems to have absorbed a little bit of itself!"

"What? You have absorbed some of it? Brother Fei, you hurry up and check the 'realm', whether it has been polluted, this matter is not trivial!" Hua'er jumped up in fright, and looked at Li Fei with a nervous expression, her eyes full of fear.

Li Fei originally thought it was no big deal, but seeing that Hua'er was so nervous, he suddenly became nervous, and hurriedly looked inside, but found that there was nothing abnormal in the "boundary" in his body.

Seeing that Li Fei finally opened his eyes, the flowers were about to cry: "Brother Fei, how is it? Can you suppress it? Don't be in a hurry, although the demonic qi is very powerful, as long as it is not polluted, it can still be suppressed slowly......"

Li Fei smiled happily: "Don't be nervous, although I clearly feel that I have absorbed a little, but there is no demonic qi in my body at all!

Hua'er was dumbfounded: "No, right? You are only in the middle stage of the realm, how can you be more powerful than the powerhouse of the transformation realm? Even if you are a super powerhouse in the late stage of the transformation realm, you can't have nothing at all! ”

Li Fei shook his head and said, "I don't know the specific reason, maybe it has something to do with my exercises and that." After all, the 'Transforming Saint Heavenly Water' is from the underworld of a higher realm, and its ability is a little stronger, which is understandable. ”

Hua'er swallowed her saliva and said excitedly, "Does that mean that I can too?"

Li Fei said solemnly: "This is not sure yet, but for the sake of prudence, you should not try rashly, at least wait until I have studied it thoroughly." ”

After all, Hua'er knew the power of the demon core, so she quickly calmed down, nodded vigorously, and said seriously: "I won't try it casually, unless I'm sure there is no danger, I'll give it a try." ”

Li Fei nodded, took out a demon core from the early stage of the demon king again, absorbed it with only a small amount of green silk, and closely monitored all the changes in his body, but he found that as before, there was still no problem, and then he was a little bolder and released more green silk.

An hour later, Li Fei had already absorbed all the power of this demon core, and his cultivation had increased significantly, and he still didn't feel any discomfort.

The next thing is simple, after Li Fei tried a few more demon cores in the early stage of the demon king, he began to test the magic core in the middle stage of the demon king, and after confirming that there was still no problem, and then the demon core in the later stage of the demon king.

A day later, Li Fei confirmed that the demon king-level demon core could be absorbed with confidence, and he did not rush to try the demon king-level demon core immediately, but began to absorb a large number of demon-level demon cores, and his cultivation was to climb up little by little at a visible speed!

In the process of absorbing the Demon King-level Demon Core, Li Fei found that if he absorbed all the Demon King-level Demon Cores at a time, there would be about thirty at most, and if there were more, the Demon Qi would remain very little in the body, and it would take a while to digest it.

A month later, Li Fei used up thousands of demon cores, and the inventory was almost exhausted, and the cultivation grew so fast that it could be described as riding a rocket, from the level of not long after the middle stage of advanced realm formation, he directly rushed to the peak of the middle stage of boundary formation!

If it weren't for the fact that the perception was not enough, Li Fei would have been able to directly hit the bottleneck! If he said it, he would definitely be able to scare countless monks to death! What even a powerhouse in the Transformation Domain Period could not do, Li Fei, a monk in the middle stage of the realm, could easily do it.

Seeing Li Fei's cultivation explode, Hua'er was shocked and said with envy: "Brother Fei, at your cultivation speed, if those old monsters know about it, they will definitely be angry to death!"

Seeing Hua'er's envious expression, Li Fei's heart moved, and he proposed: "Doesn't the baby also want to improve quickly? Although you don't dare to absorb it directly, I can purify it first, and then transfer it to you, which is equivalent to giving you a slower 'infusion'!"

Hua'er was overjoyed and said, "Can you still ......do this?" But I must be slow at the beginning, I'm afraid I won't be able to bear it, after all, not only am I not as powerful as your exercises, but I also have absorbed relatively little 'Transforming Saint Heavenly Water'. ”

"Naturally, I'll take my time. Li Fei said as he began to purify the demon core, and then carefully transferred a trace of pure demon core vitality to Hua'er.

Hua'er has only just advanced to the early stage of the realm, compared to Li Fei, the difference is too far, just a demon core in the late stage of the demon king, which makes her cultivation increase a bit!

More than ten days later, after using about 100 demon king-level demon cores, Hua'er's cultivation actually rushed to the peak of the early stage of the realm......

made Li Fei very embarrassed, it was obviously a "legitimate" right, so that he had a taste of "transaction...... But then again, he felt that it was a special and fulfilling feeling......

Then, Li Fei began to experiment with the Demon Venerable's early stage of the Demon Core, but unfortunately found that he only absorbed a trace of it, and it took a few days to completely refine it and eliminate the threat, and he didn't dare to try it anymore, so he gave up.

Actually, this is also very understandable, the difference between the Demon Venerable and the Demon King is too great, the "Demon Seed" and quality contained in the Demon Core have made a qualitative leap, not to mention that Li Fei is only in the middle stage of the Boundary Formation now, even if he has reached the late stage of the Boundary Formation, I am afraid that he will not be able to absorb the Demon Zun's Demon Core at will, unless there are other major breakthroughs.

After a few more days, Xiang Cheng and the others have basically stabilized the realm, and they came to Li Fei to discuss the next move, and now their strength has risen and their confidence is full of confidence! It is worth mentioning that Xiaohuo, Xiaoice and Jingtong, I don't know what the reason is, they all used up more than five Shangpin King Realm Pills to succeed, and everyone else was a success.

However, when they found out that Li Fei and Hua'er had rushed to the peak of the middle and early stages of the boundary formation respectively in just over a month, they were all so shocked that they couldn't speak.

Li Fei explained briefly, and everyone showed ecstatic expressions, and the original thoughts of leaving in a hurry were all put away, determined to collect as many demon cores as possible, so that after the realm is stable, they can quickly pull up their cultivation!

However, before they could go to the demons, a powerful monster had already targeted them and was rapidly approaching them!