Soon after Han Yu reached the bottom of the water, Blood Spirit and Liu Dazhu also came to the entrance of the cave one after another.

"This cave entrance is actually artificially made!" Liu Dazhu said in surprise after seeing that the hole was not surrounded by natural sediment.

Han Yu also looked at the blood spirit with a puzzled face: "Could it be that this cave entrance is really left by the predecessors, and what is the matter with this spiritual energy particle?"

The blood spirit looked at Han Yu, thought for a long time, and finally sighed, and said, "Forget it, considering your identity, it doesn't hurt to tell you this! This is the secret of the Heavenly Dragon Sect, and it can't be known to outsiders!"

When Liu Dazhu heard this, he was stunned, and then said, "Eh...... Well, I'll go over there for a convenient time, and you can talk. ”

"......" Han Yu was also speechless, but this matter really couldn't be known to Liu Dazhu, who was of unknown origin, and then said: "Hey, be careful, this is a thousand meters deep underwater, be careful that you take it out and be crushed directly!"

"......" Liu Dazhu scolded directly: "Yours has been crushed! Go, go!" After speaking, he swam away and didn't go out.

When Liu Dazhu left, the blood spirit set up a vitality shield again in the eyes of her and Han Yu, itself was underwater, and the transmission of sound needed to rely on internal force, and it could not spread far, plus this vitality cover, it was impossible for people outside to know what the two were talking about.

"Okay, you can tell me now!" Han Yu asked.

The blood spirit nodded and spoke, "You should know that this place is a large space opened up by the Heavenly Dragon Sect inside the Heavenly Dragon Capital, right?"

"Well, it's one of the five realms!"

"However, do you know that as long as you open up a space, you can't generate your own aura inside! The aura of heaven and earth in the other world is conserved, and after the death of the strong, the energy in the body will return to nature and transform into the aura of heaven and earth again, but this is not the case in the space we have opened up ourselves! Think about it, every time the Heavenly Dragon Sect recruits a new person, it will absorb the aura of heaven and earth in these domains and transform it into its own cultivation, although it is still a drop in the bucket compared to the total energy contained in this huge realm, but, over time, the aura within this realm has always been in a state of only going in and out, and it will eventually be absorbed, and after the aura of heaven and earth is absorbed, this huge space cannot be maintained! Therefore, when creating this space, those great gods of the Heavenly Dragon Sect had to think about how to keep the spiritual energy in this realm in a full state!"

Hearing these words, Han Yu also guessed something: "You mean, this cave is used to maintain the spiritual energy of the entire Northern Realm in this state?"

The blood spirit nodded and said, "You are right, this spring is connected to a very huge spirit gathering array in the outside world, and the gathered spiritual energy will spread through this spring in this realm, and each of these dragon's eye sized spiritual energy particles is equivalent to the energy contained in a medium-grade spirit pill!"

Han Yu was stunned for a moment: "However, looking at this rate, if you release the energy of a mid-grade spirit pill at a time, it will not be enough to maintain the energy of this entire realm!"

The blood spirit smiled and said, "Think about it, this domain realm is only used to recruit new people, and most of the people who come in every time are young people with weak cultivation, how much energy can they absorb? Moreover, the Heavenly Dragon Sect recruits new people once every ten years! That is to say, after each energy deficiency, there will be a ten-year replenishment period, plus the total energy contained in this domain realm is too huge, this difference is nothing to it at all, so, five such springs must be enough in this domain realm!"

"Five?" Han Yu's eyes widened: "There are five such springs?"

"Uh-huh! Five are for insurance, in case one of them is damaged, the other four are enough to replenish the aura!"

"So that's the case, by the way, I heard that there are a total of five Heavenly Dragon Realms in this Celestial Dragon Realm! four of them are used as assessment venues once every ten years, and one is a place for the disciples of the Heavenly Dragon Sect to cultivate, that realm is much more complicated than these realms that are only used for assessment, so what's going on?"

"I don't know too much about that middle realm, but I've heard that although the area of that realm is not much larger than the other four realms, the heaven and earth aura contained in it is more than the other four realms combined! It also has a natural spiritual vein! That is definitely not comparable to the realm we are in, so there is no need to worry about those idle things, what we have to do now is to make good use of this opportunity to improve your cultivation!" This is the outlet of the aura, and the diffusion of these auras takes a certain amount of time, this place has been nourished by hundreds of thousands of years of aura, and the richness of the aura is very terrifying, after I came to this northern realm, I am practicing here, and the speed of cultivation is several times faster than that in other places!"

Han Yu swallowed his saliva, looking at this scene of aura brilliance in the sky, he also felt very shocked in his heart, this is equivalent to being in an endless ocean of aura, and the aura around him will always be enough for you to absorb!

At this time, Han Yu suddenly thought of another question: "Shouldn't there be some heavenly treasures growing in such a place where the spiritual energy of heaven and earth gathers, or some other creatures live?"

"Why are you still thinking about these things, you think about the fact that this is a thousand meters deep underwater, what kind of natural treasures can survive under such conditions!" The blood spirit said angrily: "As for other creatures, there used to be them, but they disappeared after I came!"

"Ahh

"Of course it's driven away!" the blood spirit said casually, "Since this girl has come to this good place, how can she share it with others?"

"You're really domineering, where did you drive people to?" Han Yu touched his nose.

"I don't know, don't look at the area of the small pool you see on the surface, but when you get here, the area is very large, and there are even underground rivers that connect to other places, as long as you drive those aborigines to other places, as for where you go, I don't know very well, this place is too big, I haven't explored it, maybe in this underground, you can still meet the existence of seven mutant beasts like me! I don't care so much, as long as I guard this piece of land. The Blood Spirit said seriously.

"Are you saying that there are creatures you don't know exist?" Han Yu asked with some surprise.

"I haven't been here for long, and of course it's impossible to get a thorough view of it! Especially since the underground is so huge that movement is hindered, I don't bother to run around! With a bit of playfulness, the blood spirit said with interest.

"...... "The deterrence of the Seven Mutant Beasts is still there!" Han Yu thought.

"Ah, you are a cabbage when you are a Seven Mutant Beast, just run out of one casually!" The blood spirit obviously saw Han Yu's worry: "In this Northern Territory Realm, there must be existences of the same level or even stronger than me, but they are basically all aborigines born in the Heaven and Earth of the Northern Regions Realm, there is no need to worry so much, at least, I can still guarantee the safety of the two of you here! Besides, you are that disciple!" I don't believe it, on my own territory, I don't even have the ability to protect myself, so it's a shame to say it!"

"Uh...... Ahem!" Han Yu also coughed dryly: "Of course I'm not worried about my safety, I'm not afraid that you will make any mistakes in this place, if you really run out, you can't deal with it!

"I said, Brother Xiao Yu, you are really sentimental...... I'm glad you care about me so much, but ...... Since my sister has arranged me here, there must be no problem! So, you can just cultivate with peace of mind. With me here, it's definitely no surprise!" the blood spirit also covered his head and said.

"Okay!" Han Yu had to nod, under the illumination of these spiritual energy particles, this place was quite bright, of course, it was only within fifty meters of this spring, and it was still pitch black no matter how far away, and the people who watched it still had some inexplicable fear.

"Huh, where is Liu Dazhu?" Han Yu also looked around, but he didn't see Liu Dazhu's figure.

At this moment, a subtle cry appeared in Han Yu's ears.

"Ahh

The sound was not loud, but Han Yu still recognized for the first time that this was Liu Dazhu's voice.

"Not good!" Han Yu's heart tightened: "Dazhu may be in danger!"

"Over there!" The blood spirit pointed in one direction: "I feel that my vitality shield is over there!" said that, he swam directly in that direction: No, I just boasted in front of Brother Xiao Yu!

Han Yu didn't dare to hesitate, he immediately swam over with the blood spirit, Liu Dazhu came down with him, after so long, Han Yu already regarded him as a very good friend, if he encountered danger here, Han Yu would definitely feel uncomfortable in his heart. It's just that after thinking about it again, this is still in the realm of the Heavenly Dragon Domain, and there is still a soul card on the body, and if it encounters a real crisis, it will only be eliminated, and there will be no danger to life.

After swimming in that direction for a distance of about a few tens of meters, I saw Liu Dazhu swimming out of the dark waters over there, hurried, with a frightened face.

Seeing Liu Dazhu, Han Yu breathed a sigh of relief: Fortunately, the person was still there and did not hang up.

Liu Dazhu saw the blood spirit swimming towards him, as if he saw a life-saving straw, he suddenly swam over and hugged the blood spirit, and said in a panic: "There are monsters, there are monsters, it bites me! Mom! Scared me to death!"

And the blood spirit obviously didn't realize that he was taken advantage of by Liu Dazhu, and moved Liu Dazhu behind him very seriously, looking at the dark place with a serious face, and didn't forget to reassure: "Don't be afraid, I'm here!"

Looking at the darkness again, there was a sudden flash of light, very faint, but it was there!

Han Yu also noticed this glimmer of light in the rear, his brows furrowed, and he stared at that place deadly, his whole body tensed, in case of a sudden crisis!