I don't know when it appeared.

It may have existed long ago.

It's also possible that it came out of nowhere yesterday.

It is a door, with black arches, made of what appears to be steel. But in fact, when people who already have advanced technology in later generations use the most cutting-edge analyzers to scan it. It was discovered that the constituent elements of what looked like steel did not exist in this world.

And its molecular arrangement is also a completely new structure.

This means that it does not belong to this world.

The first person to discover it was Clough.

A Western Continent man, to be exact, a merchant.

When Clough and his caravan, for some reason, had to venture down a new route, it was in the middle of that road.

So abrupt, so mysterious.

It is 56 meters high and 18 meters wide, with two closed doors carved with some symbolic patterns and symbols.

When Clough pushes the seemingly heavy, but in fact barely weighty gate, despite the opposition of his men.

He didn't know that what he had pushed open was the door of a new era.

When the door opened, there was a dim world inside, with vague silhouettes of lofty mountains.

Clough has made the crazy decision to explore the world inside the door!

This decision made him one of the greatest people of the new era, without it.

Despite the opposition, Clough wiped out the resistance. Under a hefty bounty, a makeshift expedition appeared.

Led by Clough, the expedition of guards and coolies entered the door.

Three days later, they returned.

There were eleven people when they left, and when they returned, there were only two.

Clough and one of the guards, they were in a trance, and they were in disarray. As long as they are not blind, they can see that they have an extraordinary encounter with the door.

People asked about the world behind the door, and Clough didn't say anything, just told him to close the door.

For a long time afterward, he said nothing about his trip to the door. It wasn't until two years later that he wrote this text with pen and paper.

‘... It was a perverse world, where hope and despair coexisted, and light and darkness played together. There are unimaginable riches there, but the devil watches over them. Those dark people, those blasphemous beings. They are cunning and cunning, don't expect to defeat them, how can a drop of sea water flood the entire ocean? ’

Even though this cautionary word was widely circulated, the people who went to explore behind the door still rushed forward, after all, Clough did bring back something like gold from behind the door.

They are lighter than gold, but more brilliant in color. They are known as "Devil's Treasures" and are sold for a dazzling price!

As a result, the door named after Clough became known to more and more people.

Legends of the Bad World, the Dark People, and the Devil's Treasure keep popping up......

And just like that, 37 years later, a second Kraft door was discovered.

Behind the door, there is a new adversity.

For this, one had to number the adversity.

A thousand years later, a total of 127 Kraft doors were discovered!