As some smart people had guessed, after Long Fei passed the checkpoint, he hurried more than ten miles in the direction of Cairo City, and then changed his route and went directly to the direction where the Demon Cultivation Pool was located.

At the moment, he does not know that his whereabouts have been leaked.

However, when he rushed to the area where the Demon Breeding Pool was located, through the exploration power he released, he clearly captured the powerful demons, and quickly walked through the void to the location of the Demon Breeding Pool, and concluded in his heart that most of these demons who rushed to the Demon Breeding Pool were aimed at him.

Although he was aware, Long Fei didn't bother to pay attention to it, and hurried forward for more than thirty miles, looking from a distance, he could see a large area in front of him that was surrounded and blocked by demon soldiers and demon generals.

However, to Long Fei's surprise, after he had traveled more than ten miles in the underground space, he suddenly noticed that the soil layer close to the direction where the Demon Breeding Pool was located had undergone a qualitative change, and it had become a few points harder than the hard steel.

"Originally, I thought that the underground space was empty, and it was possible to pass directly through the underground space and reach the bottom of the underground space of the Demon Breeding Pool, where there was a core formation to maintain the nutritional supply of the Demon Cultivation Pool, but I didn't expect that this underground space was so hard that it was very difficult to forcibly break it. If you have the ability to break it, you will also alarm the demon soldiers and demon generals patrolling the surface because of the movement you create, and bring trouble to yourself. ”

The way forward was blocked, Long Fei stopped the pace of progress, fell into silence, after a while, rushed to the hard blocking soil layer, Long Fei tried to urge the refining energy of the system, the refining power smoke past, and the hard soil and stone layer, and then planned to use the refining energy of the system to refine it.

Refining that solid layer of soil went very smoothly.

After the solid soil layer in the underground space that was sealed was refined, Long Fei walked through it, and it seemed that he did not receive any obstacles, but when he drilled through the thick solid soil layer, he was surprised to find that in the center of the underground space formation operation hub, there were more than 100 powerful monks, sitting there cross-legged, just waiting for him Long Fei to appear.

"The formation of this underground space is still functioning normally. Do these masters, hiding here, think they can stop me from sabotaging? Don't they know that the destructive power I created by fighting them in this underground space cannot destroy the foundation of this working formation? Or do they think that as soon as I appear, they can easily capture me, and there will be no major conflict force at all?"

After probing the situation in the center of the Formation Hub of the Bottom Space, Long Fei frowned slightly, and then through the spell, he visited those demons who were patiently waiting in the center of the Formation Hub.

Soon, Long Fei discovered that among these demons who were patiently waiting for him to appear, there were actually powerful masters whose strength would not be lower than that of the 8th level cultivators of the Qiankun Realm, if he rashly rushed over to make a move, with his current Defense of the Immortal Divine Body Exercise Strength, he would not be able to withstand their attacks at all.

"In order to deal with me, in order to keep the Demon Cultivation Pool in this Eightfold Heavenly Demon Domain from being destroyed, the Demon Boss actually sent such a powerful master to sit here. It seems that this Demon Cultivation Pool in the Eightfold Heavenly Demon Domain is really very important to the demons in the Demon Domain. Since I know that there will be danger in breaking in, I will avoid it for the time being, and after my defense is improved, it will not be too late to come and deal with you. ”

Knowing that once the demon hair was traced, there might be danger, Long Fei was extremely decisive and immediately chose to retreat.

After moving away from the operating formation at the bottom of the Demon Cultivation Pool, Long Fei did not leave the underground space, but chose to continue deeper, he wanted to see if the planet in the Demon Domain was also like the planet in the human world, with a star core.

Nearly 100 million miles deep into the depths of the planet, Long Fei sensed that his body's endurance capacity had reached the limit, but he found that this place was far from the core of the planet, and it was not until then that Long Fei really knew that the planet where the Demon Domain Eight Heavens was located was far larger than the largest planet among the nine realms of the human world, several times larger.

After determining that this was the endurance limit of the "Immortal Divine Body" exercise, Long Fei did not continue to go deeper, but chose to stay here, temporarily borrowing the oppressive power of the underground space to accumulate the experience points of the "Immortal Divine Body" exercise upgrade.

At the same time, he also began to try to use the Immortal Divine Power Gathering Secret Method to see if he could gather the Immortal Divine Power in the underground space of this planet and use it for him.

After trying, Long Fei was surprised to find that the amount of immortal divine power in the depths of this planet was much more than the immortal divine power that existed in the underground space of any planet he had visited before, and his heart suddenly felt extremely excited.

Because in this way, he was able to use the Immortal Divine Power to quickly practice the "Immortal Divine Body" exercises, which he could use to quickly improve the level of the exercises, so that the improvement speed of the "Immortal Divine Body" exercises had been greatly improved on the original basis.

Minutes and seconds passed.

A month passed like this, until Long Fei, who was in a state of cultivation, found that he could not continue to gather immortal divine power through the actual combat immortal divine power gathering secret method, so he stopped practicing the method.

Because in the process of practicing, Long Fei did not pay attention to the upgrading of the exercises, until he stopped the operation of all exercises, Long Fei only checked his personal attributes through the system.

When he checked the details related to his "Immortal Divine Body" exercises, Long Fei was stunned, and an extremely shocked expression couldn't help but appear on his face, because it was only then that he was surprised to learn that the level of the "Immortal Divine Body" exercises had been directly increased by 3 levels, reaching the current level of 7.

That is to say, just by relying on the defense of the Immortal Divine Body technique, Long Fei would be able to withstand the full strength of the peak level master of the Qiankun Realm and attack many times, and there would be no danger to his life.

"After the Immortal Divine Body Technique reaches level 7, it should be able to support me to continue to go deeper, reach the core of this planet, and see the star core as I wish. In addition to the surprise, Long Fei did not forget the purpose of his trip, so he did not hesitate at all, and immediately set off to continue to the depths of the underground space.

About 90 million miles into the depths of the underground space, a star core that bloomed with dazzling light entered Long Fei's line of sight, and the light released by the star core carried an extremely terrifying force of oppression and repulsion, only blocking everything in the large area near the star core, turning the large area there into a vacuum.

If Long Fei's defense was not strong, I am afraid that at this moment, the power carried in the light of the light irradiated by the star core would have already turned into ashes if it swept through his body.

"The planet of the Demon Domain also has a star core, if you refine the star core of this planet, you should be able to directly light up at least five hundred gray planets on the 'Ten Thousand Star Array Map'. Seeing the star core, Long Fei was excited, and a smile that was a little brighter than the sun immediately appeared on his face.