Suddenly, Lin Fei saw Dugu Aotian holding the moon blade and rushed towards the monster, the moon blade bloomed with a cold moon-like light, and actually separated the monster from the body behind him, Leng Daoqiu's body fell to the ground the most, and the monster was a pitch-black figure, revealing a bloody mouth, and rushed towards Dugu Aotian.

"If you can't do it, you will die!" After Dugu Aotian finished speaking, the moon blade in his hand slashed suddenly, and suddenly a round of full moon attack, rushed out of the moon blade, and rushed directly towards the dark monster.

Brush!

The monster was instantly split in half by the moon blade, and at this time, Dugu Aotian shot again, flashing at lightning speed, and in the blink of an eye, thousands of full moons completely divided the black monster into countless pieces.

Dugu Aotian beckoned, and the black ancient mirror devoured these black monsters, but at this moment, a black light suddenly appeared, rushing towards Lin Fei!

"Not good!"

Dugu Aotian felt the breath of the monster from the black light, and the monster still wanted to escape from here!

"Want to run? It's not that easy! Dugu Aotian said, stretched out his hand, and the moon blade in his hand rushed out directly, catching up with the black point of light like lightning, but although it hit the black point of light, Dugu Aotian found that there were still black particles, which rushed directly into Lin Fei's body, Lin Fei was unconscious at all, looking at Dugu Aotian's strange eyes looking at himself, he didn't understand what was going on.

"Senior brother, what's wrong?" Lin Fei asked.

Dugu Aotian was stunned for a moment, he smiled and said, "It's okay, I'm fine, by the way, are you okay?" Didn't get hurt, right? The monster actually entered Lin Fei's body a little bit, which made Dugu Aotian not know what to do.

"It's okay, I didn't make a move, and I stood far away, I don't want to be affected by you two perverts, right, the monster is solved?" Lin Fei asked.

Dugu Aotian nodded and said, "It's solved, the sword will be returned to you!" After Dugu Aotian finished speaking, he suddenly threw the moon blade in his hand to Lin Fei, the moon blade can suppress the power of darkness, Dugu Aotian feels that little bit of black qi should be affected by the moon blade, and it will be slowly eliminated.

Lin Fei happily stretched out his hand to catch the Moon Blade, but the Moon Blade disappeared again halfway through, and he groped around and found that he couldn't find any trace of the Moon Blade at all.

"There's no way, it may not want you to use it, you just do it first, you can't force it, but this sword has a spirit, it's a rare good thing, even in the upper realm, it's not something that ordinary people can use." Dugu Aotian said, beckoning the ancient mirror back, and the small lake was empty, leaving only the black cave entrance.

"Alas! Forget it, I don't force it, if you love it, you will come out, and if you don't love it, it's not uncommon! Lin Fei said, but obviously he was very rare about this thing, if it wasn't for Dugu Xiaoqi and the power of darkness, he might have got this moon blade in his hands, but unfortunately it was finally taken back by Dugu Xiaoqi and suppressed here.

"By the way, senior brother, what should I do next?" Lin Fei asked.

Dugu Aotian smiled and said: "The next step is very simple, and my father gave me a task, so I have to go down to the junction of the upper realm and the lower realm, and then put the ancient mirror in the loophole, only in this way can the matter of the dark power entering the lower realm be solved." ”

"Then you go quickly, since the matter is settled with me, I will go back first." Lin Fei said, turning around and leaving.

"Wait!"

Dugu Aotian suddenly shouted to Lin Fei and said, "Doesn't Senior Brother want to know about the things in the Upper Realm?" ”

Hearing Dugu Aotian's words, Lin Fei became interested, he was very interested in the things in the upper realm, and he wanted to know, but no one told him, so he was very helpless.

This time, Dugu Aotian was willing to tell him about the upper realm, which was of course the best, so Lin Fei turned around and said, "I want to know, but you won't have any conditions, right?" ”

Dugu Aotian smiled dumbly, and said: "What conditions can I have, I just think it is necessary for you to know about this matter, otherwise this kind of matter in the upper and lower realms is not allowed to be talked about, and you must bear the due consequences after you finish speaking." ”

Lin Fei nodded, understanding Dugu Aotian's words, it was like spreading a truth casually when the news of the blockade was not tender, and some secrets were not because they couldn't be known to civilians, but after saying it, what would be the consequences? Causing chaos outweighs the cost!

Moreover, the upper and lower realms, even in the world of ancient martial artists, do not know about this matter at all, only a few high-level people, such as the Three Immortals, as well as the masters of the Dou Sect, and masters like Liu Muqing, will know, and others are not qualified to know at all.

"Then you say, what is the upper realm and the lower realm, and what is the relationship between the two?" Lin Fei asked.

Dugu Aotian smiled and asked Lin Fei rhetorically: "Little junior brother, do you know what three-dimensional space and four-dimensional space are?" This is also what you say in the lower realm, and in your lower realm it is easier to say. ”

"Three-dimensional space?"

Lin Fei thought about it for a while, when he was in Mu Shanshan's house, he had studied some things, three-dimensional space is the place where they live, that is, where ordinary people live, one-dimensional space is a straight line, simply put, it is like only length, two-dimensional space has length and width, just like a flat world, with two properties, length and width, three-dimensional space is simply a space with length, width and height.

Of course, this is Lin Fei's simple understanding, if it is not bad, it is so, as for the four-dimensional space, it is different, according to the description of the data, the four-dimensional space is the combination of time and space, a higher level of place.

Lin Fei briefly said what he understood, Dugu Aotian nodded, and said: "Although it is a mess, I have some understanding, so let me simply say that if you live in a three-dimensional space, then the upper realm is a four-dimensional space!" ”

"Is there really a four-dimensional space?" Lin Fei was a little surprised.

"Of course there is, it's just that you don't know, and space and space can overlap, especially the high-level space to the low-level space class, the low-level space creatures, it is difficult to enter the high-level space, the high-level space creatures, can enter the low-level space, but it will cause the disorder of the low-level space, and the low-level space is suppressed by the high-level space creatures." Dugu Aotian said.

Then, Dugu Aotian continued to explain: "Just like what you see me now, my strength has actually been suppressed, and it is very seriously suppressed, which is why I am so weak. ”

Hearing Dugu Aotian's words, Lin Fei was suddenly ashamed, he was so powerful and said that he suppressed his strength, if he didn't suppress it, how scary would it be!