But after he discovered a space channel, in just a dozen years, he broke through to the realm of the grandmaster and became the number one master in the world.

So a big war inevitably happened, although that person's cultivation was superb, but the ants bit the elephant to death, and finally fought to defeat both, and if the fight continued, they would all end up, and the descendants of that person also suffered heavy casualties, and finally both sides had to stop.

After discussion, they jointly owned the right to use this space, and at first, humans did not know how big the other half of the space was, because through the space passage, they would appear on a small island.

And this small island is on a large and extremely wide river, and they do not dare to leave the shore of the small island, because there are many terrifying monsters in the river and on the other side.

But with the slow development of human beings, the aura of the human world is slowly filled, and generations of geniuses continue to emerge, and finally, human beings slowly try to step out of the island.

However, the war inevitably broke out, at the beginning, the two sides of the war were quite restrained at the beginning, and at most only six or seven level warriors participated in the battle, and later with the continuous escalation of the war, those masters who cultivated to a truly high level also participated.

Whether it is a demon or a human, there are master demons who have low intelligence and slow cultivation, but they have a large base, and they have much more time to cultivate in this superior environment than humans.

And after thousands of years of cultivation and development, human beings have long cultivated some masters, and the masters of both sides will crack the sky and the earth and shatter the mountains and rivers as soon as they make a move.

Just when everyone thought that if this continued, maybe the two worlds would be devastated, the masters of both sides actually disappeared quietly, whether it was a demon, a demon, or a human, as long as it was more than level 10 cultivation, they all disappeared.

No matter how to look for and explore, there is no clue, there is such a big change, both sides tacitly stop the war and start to investigate, but no matter how to investigate, there is no clue, as time slowly passes, everyone gradually forgets about this matter.

But when there was another level 11 powerhouse in the human race, he suddenly disappeared, but this time it was different, this time the disappeared person left a letter, not saying where he went, nor when he would come back, but just told his descendants that sooner or later, one day, these people they left would come back.

And tell them that if one day the master of the demons returns, and they haven't come back yet, then go to a place and open a passage, so that they can return early, but if the master of the demons does not appear, or if the humans can resist temporarily, don't open that passage.

As long as they come back, at that time, whether it is a demon or a human, only one of the two sides can exist, and what awaits the other side will be completely wiped out.

The specific location of the passage was not said on the stone slab, because only the descendants of that person knew, but the location of the passage, Lu Yu had already guessed it, and he had also been there.

The last thing to say is this underground space, it turned out to be the island where humans first arrived at the other world, as for why it became like this today, Lu Yu also guessed, I don't know how many years have passed, the vicissitudes of life, it is not surprising that this place has become like this.

And the reason why no one knows here, because all those who come here must be level 10 masters, and this is the place where masters above level 10 cultivate.

As for what happened later, causing no one here, it is not for Lu Yu to know.

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