Inside the hut, Mo Yu began to check the day's harvest.

The seven hundred gold coins borrowed from my grandfather were only two hundred at first, but later through refining the Thunder Fire Bead, not only did he earn back one thousand four, but he also obtained four first-order demon cores.

The Demon Core, on the Dou Qi Continent, is also known as the Demon Crystal, which is a kind of energy crystal nucleus in the body of the Demon Beast, which is filled with extremely violent heaven and earth energy, for this kind of violent energy, even if it is a Dou King, he does not dare to risk the risk of exploding his body and forcibly inhale it.

Therefore, in the Dou Qi Continent, most of the role of the demon core is to be used as a kind of alchemy material for alchemists, or to be blessed on weapons, increasing the destructive power or increasing the special effect of Dou Qi.

Therefore, the magic cores on the continent are almost in short supply all year round, and as soon as the higher-level magic cores appear in auctions or other places, they will be taken away at a high price.

The high cost of the magic core has naturally created a large number of mercenary groups that specialize in hunting and killing demonic beasts for a living, but it is not an easy task to obtain the magic core from the fierce and cunning demonic beasts.

Therefore, the value of the demon core in the Douqi Continent has always been on it for a long time, and it is extremely sought-after.

And the reason why Mo Yu didn't even have a gold coin to heat up, so he bought four first-order demon cores, because he wanted to inhale the magic core energy.

That's right, it's to absorb this violent energy that even the Dou King doesn't dare to touch easily.

Now Mo Yu's strength has faintly touched some bottlenecks, and if he wants to continue to improve his strength, he has to rely on water grinding, after all, the talent of the original body is too poor.

Moreover, Dou Zhi Qi can only be cultivated in a decent manner, because the veins in the body of a cultivator at this stage are extremely fragile, once they take foreign objects, such as pills, it will cause some discomfort in the light case, and if the medicine is too strong in the heavy case, it will be a miserable end for the person who is broken.

And Mo Yu didn't have the foundation building spiritual liquid that Yao Lao specially configured for him to improve the power of fighting to cultivate, and even in the entire continent, only Xiao Yan alone could enjoy this kind of treatment.

Because in the entire continent, only Yao Lao can refine his unique foundation building spiritual liquid.

Although Mo Yu had also mastered some other precious prescriptions in his previous life, he naturally didn't have a collection of prescriptions like this to increase the cultivation speed of the power of the foundation fight.

However, since this method of taking pills does not work, Mo Yu is not out of options.

That is, after using Xuan Lei to devour energy, after completing the evolution, it will be fed back to him!

So Mo Yu hit the idea on the demon core.

The extremely violent heaven and earth energy filled inside the demon core cannot be absorbed by the fighter, but it does not mean that Xuan Lei cannot!

In a certain respect, Xuan Lei is the most violent representative of the energy of heaven and earth, so the relationship between the two is not mutually exclusive.

And the extremely violent thunder and fire energy contained in the Vermilion Bird Burning Sky Thunder are extremely compatible with the thunder and fire demon cores, so they can be said to be extremely suitable for absorption.

Thinking of this, Mo Yu didn't hesitate, took out a magic core, and prepared to start refining and absorbing.

As soon as his mind moved, a crimson thunder suddenly gushed out from the palm of his left hand, and then a squeaky electric sound sounded in the room.

Suzaku Burning Sky Thunder!

Seeing this, Mo Yu slowly took out a crimson magic core in his right hand.

This is the magic crystal of the first-order demonic beast flame wolf, and in the first-order fire system demon core, it is also extremely good, it seems that the boss of Gree did not cheat on him.

At this time, there was still a little blood on the demon core in his right hand, but Mo Yu didn't care about it, and directly threw it into the red thunder.

As soon as the demon core was thrown in, it was swallowed by the red thunder, as if sensing some kind of food, and the Vermilion Bird Burning Sky Thunder emitted an even more violent squeaky electric sound......

At the same time, with the refining of the demon core, streams of violent heaven and earth energy also poured out from it, but these violent energies that even the Douwang powerhouses did not dare to inhale easily, when they encountered the red thunder, it was as if a mouse had seen a cat, and it was quickly devoured and absorbed, and there was not even a bit of scum left.

Three hours have passed, and the hard demon core has been refined to one-third of its size, and after absorbing the violent heaven and earth energy in the demon core, the form of the Vermilion Bird Burning Sky Thunder is gradually expanding, and the power of the thunder contained in it is also slowly rising.

Seeing that absorbing the magic core really had an effect, Mo Yu also nodded with satisfaction, then closed his eyes, and slowly waited for the transformation of the magic core.

Unconsciously, a day and a night passed like this, and at this time, I saw that the crimson magic core in the red thunder had disappeared, and the violent heaven and earth energy contained in the demon core seemed to have never appeared, only the crimson Xuan Thunder, which had doubled in size, appeared in Mo Yu's palm.

"It seems that the effect of this first-order demon core is not bad, and it has actually made the Vermilion Bird Burning Sky Thunder grow so much."

Looking at the more condensed thunder in his palm, and the surging violent energy contained in it, Mo Yu couldn't help but smile on his lips.

Sure enough, devouring the demon core is of great benefit to Xuan Lei's growth.

However, the reason why he was able to devour a first-order demon core and grow so quickly was mainly because the strength of today's Xuan Lei was too weak and the starting point was too low.

However, at this time, Mo Yu didn't pay much attention to the future, looked at the crimson thunder in his hand, and said confidently.

"It's time to break through the Eight Stages Dou Qi!"

Although he has not rested for a day and a night, his spirit is extremely high at this time, and sure enough, improving his strength is the biggest aphrodisiac for men.

After making up his mind, Mo Yu did not hesitate, after retracting the Vermilion Bird Burning Sky Thunder into his body, he sat cross-legged, his hands resting gently on his legs, and his mind controlled his breathing.

As Xuan Lei entered his body, the next moment, a huge amount of energy suddenly appeared in the young man's body, and in the face of this situation, Mo Yu did not panic, but frantically absorbed the rich energy that rushed to his face.

With the absorption of energy, I saw that the momentum of the young man's body was also slowly rising.

After the endless demand lasted for half an hour, it finally began to gradually slow down, and at this time, the energy fed back by Xuan Lei had weakened a little.

When the last wisp of gentle energy drilled into the body along the meridians, Mo Yu's body was slightly silent, and then there was a violent tremble, the lower abdomen contracted slightly, Mo Yu's eyes suddenly opened, and in the pitch-black pupils, the red thunder light passed rapidly, the mouth opened slightly, and a mouthful of turbid gas was spit out...

As soon as the turbid gas left his body, Mo Yu's handsome face suddenly became a little more energetic.

Opening his eyes, Mo Yu twisted his neck, making a crisp bone sound, and his palm was slightly clenched, a sense of full power made the corners of his mouth outline an arc.

"The power of the fight, the eighth stage!"