"Maybe, but according to the observations of our astronomical telescopes on the earth, it will take hundreds of thousands of light years to distance the outer galaxy from the Milky Way, Demon Emperor, I want to ask, who set up the space teleportation center between these four worlds, and can teleport at such a long distance. Ye Kai suddenly thought of a very important question, which he had always wanted to know.

"What do you mean by light years?" the Demon Emperor asked in confusion.

"Light is the fastest in our knowledge, so we also use light as a unit of measurement on Earth, and the distance of a light-year is about trillions of kilometers, for example, the speed of light between your two main stars is about a few hours. Ye Kai explained.

"Well, it's really the fastest speed, as for the space teleportation array you mentioned in the ancient era, it has to be said that the ancient emperor was proficient in the way of space, but as far as I know, although we are emperor-level, even if we are proficient in the way of space, it is impossible to teleport such a long distance, it is more likely that the god set it up when he created these four worlds, in short, this is definitely not something that our emperor-level can create." The Demon Emperor nodded slightly.

"It seems that the one who can create this kind of spatial teleportation distance is estimated to be the god who created this world, I originally thought that it was created by your emperor-level!, but the elf priest who brought me here seems to be proficient in this aspect of the divine power!" Ye Kai suddenly remembered the spatial divine power that the elf priest brought him here to display.

"That's their unique skill, but the distance is not that far, at most more than 10,000 kilometers at a time, and when you master the laws of heaven and earth in the future, Queen Jin can also have the magic power to tear the space, although the distance is not as far as the elf race, but there are thousands of kilometers at a time. The Demon Emperor explained.

"Oh, as long as you advance to the emperor, you can also travel in the void?" Ye Kai asked excitedly, this is what he wants, and he may really be able to return to Earth in the future.

"Although the emperor can tear the space, but it is not as strong as you think, after all, it takes a lot of money to tear the space and shuttle once, and at the same time, you also need to have coordinates, otherwise it is easy to get lost in the void, I estimate that those ancient powers of our four worlds leave the four worlds to explore the outer void, and they may be lost in the void and cannot come back. "The Demon Emperor pounced on the cold water.

"Thank you Demon Emperor for reminding me, remember it in the next place!" Ye Kai said humbly.

"Since you came to our demon world this time, then it can be regarded as fate, I see that you can practice the exercises of the Demon Emperor of the Heavens, then I will pass on to you a set of exercises that I became famous, you know that I and the Houqing Demon Emperor are known for fighting, so my exercises are also based on attacking and domineering, this set of exercises is three styles, as long as you can learn it, it can add a combat power to you!"

Ye Xingxing was overjoyed, he didn't expect that he would gain so much from coming to the Demon Realm this time, and get the exercises of the two demon emperors, and after returning to the Immortal Realm this time, he would have to retreat and cultivate, and when he fought with other races in the future, his hole cards in battle would increase again, especially now that he really has no offensive skills.

After receiving the jade plaque with both hands, Ye Kai hurriedly thanked the Demon Emperor, and at the same time impatiently used his divine sense to investigate, and it was indeed a set of offensive combat techniques.

"Don't thank me first, it's up to you whether you can learn before the alien invasion, I have cultivated this set of exercises for hundreds of thousands of years before I finally succeeded in cultivating. "The Demon Emperor didn't believe that Ye Kai would be able to cultivate successfully in just a few hundred years.

Ye Kai muttered in his heart, "Is it really so difficult, give me ten years to ensure that I can cultivate." However, he still said politely: "What the Demon Emperor said is that I will try my best to cultivate, and when things happen here, I will return to the immortal realm, choose to retreat, and strive to improve my cultivation before the invasion of the alien race." ”

"Okay, I hope that when the time comes to fight with the aliens, we can fight side by side!" "The Demon Emperor said happily, he has helped Ye Kai now, and I believe that Ye Kai will definitely remember his kindness.

"Demon Emperor, don't worry, I will remember your favor, and at the same time, I also hope that the Demon Emperor will order to recall the people who fought in the Demon Realm and the Immortal Realm, return to the Demon Realm for retreat, and at the same time contact the emperors of the Four Realms to discuss the method of resisting the enemy. Ye Kai naturally saw the intention of the Demon Emperor, and he would not find himself for no reason, just to pass on a set of exercises to himself.

"I also have this intention, I will go to the other three major interfaces to meet the emperors in the next few decades, and at the same time, the war between the Demon Realm and the Immortal Realm and the Demon Realm will also end. The Demon Emperor replied.

"Okay, Demon Emperor, if there is nothing else, I plan to leave the Demon Realm and return to the Immortal Realm, and after taking care of some small things, I also plan to retreat. Ye Kai got up and said goodbye.

"Okay, you want to return to the fairy world, I will ask the elf clan to send you to the place where the demon world and the fairy world meet, and let them pass my order by the way. The Demon Emperor said politely.

"Then I'll bother the Demon Emperor, I'll see you on the battlefield in the future. Ye Kai bowed and thanked him.

Farewell to the Demon Emperor, Ye Kai under the leadership of the elf sacrifice, half a month later, he came to a low-level star in the fairy world, more than a year faster than Ye Kai's own return to the fairy world, Ye Kai was deeply shocked by this space supernatural power, and really wanted to learn this space supernatural power, but after understanding, he completely gave up such an idea, even if the elf clan is willing to teach, he may not be able to learn it, because this exercise can only be learned by the elf clan.

After arriving at the low-level cultivation star of the immortal realm, Ye Kai quickly found the teleportation center on the cultivation star, and learned through the teleportation center guard that the return to the immortal realm here still needs to go through the teleportation center of seven or eight stations to reach the eastern star of the immortal realm.

"Dongxing?" Ye Kai first stepped into the place of the fairy world, since Bo Lanxing came to this immortal world, more than a hundred years have passed, and he has not really spent much time in the fairy world, as soon as he heard Dongxing, he recalled the bits and pieces on Bo Lanxing.

"Since I want to go to the East Star this time, let's go to the Bolan Star first to take a look, I didn't have that ability before, now it's time to take the old patriarch and others to the fairy world, and when these things are over, I am going to hell, and the soul of Ba Ashmita will be recovered, so that I can retreat and cultivate with peace of mind at that time. Ye Kai thought of the old patriarch, thought of Xin'er Beth, thought of Hutuo's father and others, in case of a war in the future, the first mortals on these low-level stars may suffer.

Three days later, Ye Kai walked out of the teleportation center on the Bo Blue Star, where the temple had gone through a lot of hardships to get here.

As soon as Ye Kai walked out of this teleportation center, he was immediately greeted by a guardian, and the guardians here were the people of the Snow Clan that Ye Kai knew at the beginning, and they were the people appointed by the Immortal Realm to guard the teleportation center here.

If the cultivators on the low-level stars can reach here and enter the immortal realm, they generally don't pay attention to it, but from the immortal realm, they will come forward to greet them in person, and many immortals in the immortal realm will often patronize these low-level stars, because they are immortals in the eyes of mortals or cultivators here, high up, accept the incense of mortals here, they can see mortals, but mortals can't see those immortals at all, unless the immortals themselves reveal themselves.

After Ye Kai glanced at the temple and the sacred mountain that he admired at the beginning, he directly sacrificed the shuttle and headed towards the Boer Kingdom, originally he had gone through thirteen years of cultivation, but at this moment, he came to the mid-air of the Boer Kingdom in less than an hour through the Feishuo, Ye Kai took the shuttle and overlooked the Boer Kingdom below, and after finding the direction of Hailan City, he flew over quickly.

Looking at this familiar building, Ye Kai was very emotional, this is the starting point of his cultivation, and it can be regarded as his home in these four realms, Ye Kai did not alarm anyone, and he had already come to the old patriarch's house in a flash.

The old patriarch was lying on the rocking chair at the moment and napping with his eyes closed, and he couldn't sense Ye Kai's arrival at all, although more than a hundred years have passed, the old patriarch doesn't seem to have changed much, and the furnishings inside haven't changed much, Ye Kai silently looked at everything here, recalling that the old patriarch was honest about helping him, a stranger, and his eyes were full of emotion.

It wasn't until half an hour later that Ye Kai gently asked, "Old Patriarch, I'm Ye Kai, are you awake?"

In fact, even if the old patriarch fell asleep, with his cultivators, he could wake up with a little movement, but Ye Kai's current cultivation was considered a bodhisattva in the immortal realm among these mortals, and if he didn't take the initiative to appear, it would be impossible for anyone to notice.

The old patriarch was immediately startled by Ye Kai's shout, thinking that he was dreaming, even if someone came in, he should know, could it be that he was still in a dream, the old patriarch rubbed his eyes, and then noticed that Ye Kai was looking at himself with a smile, this is not a dream.

"It's really you, little brother Ye Kai. The old patriarch quickly stood up, grabbed Ye Kai's hand and asked excitedly.

"Of course it's me, I'm coming back from the fairy world to see you. Ye Kai also replied happily.

"You really went to the fairy world, sure enough, I didn't see the wrong person, I'm really afraid that you will fall on the road!" said the old patriarch excitedly, wiping the tears from the corners of his eyes.

"Old patriarch, don't you think I'm doing well! I'm here to take you to the fairy realm. Ye Kai was also very moved, the old patriarch was like his own relatives and elders.

"What are you talking about, take me to the Immortal Realm, can you go to the Immortal Realm without cultivating to become an immortal?"

"Actually, the immortal world is not as high as you think, and it is the same as this wave of blue stars, it is nothing more than that there is immortal energy on it, it is easier to cultivate, and there are higher-level cultivation techniques. Ye Kai explained while giving a general account of how he left here and went to the fairy world.

The old patriarch on the side was dumbfounded, especially for Ye Kai's various experiences, as if he was experiencing it himself.