Chu Xun didn't expect that this fusion would be so painful.

At this moment, he only felt that every inch of his body's muscles, bones, and even cells were constantly piercing, tearing, and burning by some sharp and terrible thing.

That kind of severe pain like broken bones, if it were replaced by an ordinary person, I am afraid that I would have died of pain long ago, and even with Chu Xun's super endurance, he couldn't help but let out bursts of crazy and sharp screams.

This kind of pain is simply not something that human beings can bear!

And in this terrible pain, Chu Xun also felt that his body was undergoing an essential transformation, becoming more pure, more refined, and more powerful.

"Wow!" At the same time, Chu Xun suddenly felt an inexplicable nausea. This feeling of nausea and vomiting came so quickly and so quickly that he was not prepared at all, and he vomited loudly.

What was shocking was that what Chu Xun spit out at the moment was extremely disgusting and terrifying. The vomit was a mix of things, from dark red blood clots, broken pieces of flesh, to strange biological tissues that were unsure of what they were, but that smelled sour and rancid.

As the vomit was continuously spit out by Chu Xun, bursts of intense foul odor and sour odor also spread in the room. However, the strange thing is that after vomiting so much blood and minced meat, Chu Xun felt that his state was getting better and better, not only was the sharp pain gradually subsiding, but his body was also getting more and more relaxed, as if he had suddenly lost a heavy burden.

It's a feeling like it's never been better!

"What's going on, how can I have so much filth in my body?" Looking at the disgusting vomit on the ground, a trace of horror also appeared on Chu Xun's face.

He couldn't figure out where all this vomit was coming from!

"Don't worry, host, these are all impurities in your body!" However, just when Chu Xun was in doubt, the voice of the system suddenly sounded in his head: "The host has devoured too many crystal nuclei containing impurities, and the impurities in these crystal nuclei have submerged into your body with the energy, and gradually brought a certain negative impact to your body. Now you're just removing the impurities and the flesh affected by them from your body, and it's good for you. ”

"These things are all made by devouring crystal nuclei?" Hearing the system's explanation, Chu Xun was suddenly taken aback. How did he not know that devouring the crystal nucleus had these side effects?

However, what Chu Xun didn't know was that there were actually many people who understood the side effects of crystal nuclei, but very few people paid attention to this aspect.

Because these side effects do not endanger people's lives, but as the amount of flesh and blood affected in the body gradually increases, the growth rate of the supernatural will become slower, or even no longer able to make any progress.

This is where the "bottleneck" comes in!

It is precisely because of this that high-order crystal nuclei with fewer impurities are so precious.

However, for the vast majority of people, all this is meaningless, because these people can obtain a limited number of crystal nuclei in their lifetime, and the power they can have is also limited, and they are often not qualified to touch the so-called bottleneck and die of old age or war.

Only a very small number of people will find a way to eliminate the side effects of these crystal nuclei for the sake of their own future. For example, Chu madman and Chu Feng, they are the most typical representatives.

Born in a small border town, they are not qualified to obtain too many high-level crystal nuclei, and they often strengthen themselves by devouring standard crystal nuclei, so when they broke into a prominent position in the Supreme Council, the big man who took a fancy to them and decided to support them also gave them two choices.

The first is to provide them with a large number of resources, so that they can continue to grow like this, but at most to the seventh order, they will encounter an unbreakable bottleneck, and then they will not be able to make any progress in their lives.

The second is to use some kind of secret method to continuously temper one's body for more than ten or twenty years to eliminate those hidden dangers. Although this will make them unable to progress for a long time, once the hidden danger is eliminated, they will be able to have the possibility of hitting the eighth or even ninth order!

Obviously, Chu Madman and Chu Feng, who had greater ambitions for their future, both chose the latter, so they were silent for nearly twenty years. It wasn't until this survival game that they completely unshackled and burst out of their power.

From this point of view, Chu Xun was undoubtedly lucky, the strength and magic of the insect body ability made him not need to spend twenty years to eliminate the hidden dangers in his body like Chu Madman and Chu Feng.

All he had to do was devour an insect gene!

It is precisely because of this gene that the remodeling function of his body will be turned upside down, thus destroying the flesh and blood in his body that are infected by crystal nucleus impurities, and rejuvenating the entire body from the inside out, eliminating all hidden dangers.

That's right, what Chu Xun devoured this time was one of the genes collected from the Battle of the Worm Demon - the cockroach gene!

Of course, he devoured the cockroach gene at the beginning not to eliminate hidden dangers, but simply to improve his recovery ability and vitality. The battle of the survival game made him understand the importance of strong vitality. And more importantly, after devouring the scarab gene, most of the healing abilities are almost useless to him, so he must improve his self-healing ability as soon as possible, otherwise if he is seriously injured one day, and there is no traditional doctor who is proficient in medical skills next to him, then he is afraid that he will not be far from death.

It's just that he didn't expect that devouring the cockroach gene could not only greatly improve his vitality and recovery ability, but also help him eliminate hidden dangers in one fell swoop, which was really an unexpected surprise.

"I don't know how my recovery ability is now......" Thinking of this, Chu Xun also moved his gaze to his left hand, then took a deep breath and stabbed the claw of his right hand towards his left hand!

Click-poof!

Chu Xun's destructive power was obviously stronger than his defensive power, only to see that with a crisp sound of armor shattering and the sound of flesh tearing, his extremely bright, scimitar-like claws also pierced his left arm. Suddenly, a sharp pain also came from his left arm, and at the same time, a large amount of reddish acid blood dripped down his wound and fell to the ground, corroding the tough ground into one deep and huge hole after another.

"Damn, the power is too much!" Looking at his left arm, which was completely pierced by the claws and even almost cut off, Chu Xun suddenly wanted to cry without tears.

In fact, he just wanted to gently cut through the armor muscles and see how quickly the flesh and blood recovered, but he forgot that he had just advanced and could not control the surging power, so he seriously injured himself at once......

This oolong is also a little too big......

Enduring the severe pain, Chu Xun also carefully pulled out his claws, afraid that he would make the wound bigger if he didn't pay attention. And with the pull of his right claw, a scene that shocked him and even ecstatic also happened.

Almost as soon as his right claw was pulled out, his hideous wound had stopped bleeding and began to regenerate rapidly. In less than five seconds, the terrible piercing on the left arm had completely healed, and even the exoskeleton armor, which had been the most difficult to recover, was gradually restored. If it weren't for the fact that there was still acid blood on the ground that was corroding the ground, he would even think that everything just now was his own delusion!

This kind of recovery ability is too strong!

However, while in ecstasy, Chu Xun also felt a trace of hunger. Obviously, this recovery ability did not come out of thin air, and it also consumed his life force. The more serious the injuries he recovered, the more life energy he expended. Once the life energy is consumed excessively, then he is afraid that he will completely lose his combat ability like the original mutant cockroach king and be slaughtered.

But anyway, after having this powerful recovery ability, Chu Xun can almost be said to have an immortal body, presumably as long as it is not a critical injury such as a head, then even if the heart is gouged out again, it will recover in a short period of time, right?

Thinking of this, Chu Xun was also excited and ready to start the big lottery.

His luck seems to be good today, so let's just take advantage of it!