Great Sage

There are five characters horizontally.

"Please enter the password."

Vertically there is a row of numbers.

Just like the number keys on the ATM cash machine, there are a total of ten numbers "1234567890".

The number 0 is at the bottom, and on the same row as 0 are "Confirm" and "Cancel".

Lu Feng read it again and again.

Well, combination lock!

But, you don't even have a password prompt, how do you open it?

He tried typing 123456.

no response.

Enter 654321 in reverse.

no response!
Then enter 123456789.

Still no response.

"Screw you!"

Lu Feng kicked the door.

In an instant, the whole mountain changed, as if it was instantly connected by a set of formations, the surrounding spiritual energy was quickly drawn, and a sharp sword energy shot out from the door.

The sword energy was so fast that it was too late to dodge it, Lu Feng hurriedly sacrificed the Ruyi Golden Cudgel, and struck against the sword energy.

Bang!
With a loud noise, Lu Feng was sent flying dozens of miles away, and he spat out a mouthful of blood.

Lu Ya and the others were even worse. Although they were not directly targeted, they were also within the attack range, and they were directly sent flying hundreds of miles away.

Lu Feng wiped the blood from the corner of his mouth, staring at the gate, dumbfounded.

I didn't expect that you old man has a big temper, so I kicked lightly, and you directly summoned such a strong sword energy to kill me.

The strength of this sword energy is almost as strong as that of a quasi-sage's early-stage master. Under such a swift attack, even a quasi-sage peak master may be injured.

It was so sudden.

Hun Kun also flew upside down a few miles away, he was not seriously injured, but at this moment he praised the ingenuity of this formation.

It should be known that this is a formation that can be arranged, and it can exert such a powerful force in an instant.

The damage caused by the sword qi guided by this formation is almost the same as the power of the sword qi released by Lu Feng's Immortal Slaying Flying Knife.

Can a formation be worth a top-quality spirit treasure?
The four of them stabilized their injuries and stood in front of the hole again.

Lu Feng turned his head and asked Sanhe.

"Do you know what this password is?"

"What horse?"

Lu Feng: ...

Suddenly seeing these things in the prehistoric world still brought too much shock to him, Lu Feng felt as if he was in two worlds.

So much so that he felt that the people around him were also people who understood that era.

"How should this door be opened?"

Lu Feng changed the question.

Sanhe shook his head hastily.

"When I left last time, there was no door here. It has been tens of thousands of years, and I don't know what happened here."

Obviously, Sanhe just regarded this place as an ordinary place, and didn't find anything special about these chess pieces or mugs.

But as soon as Lu Feng felt this way in his heart, he suddenly thought of something wrong.

He came here tens of thousands of years ago, so the mug shouldn't last that long, right?
Even if a stone is placed there for tens of thousands of years, some changes will occur.

But the mug, the last time Lu Feng saw him, it looked very smooth and new, obviously it had just been made.

"Let's go back to your cave and take a look at your cup."

Lu Feng immediately turned his head and said to Sanhe.

"Hey, hey! Fellow Daoist, don't worry, I brought that cup with me."

As he said that, he raised his hand and pointed, and even sacrificed the cup.

Lu Feng immediately had a big trough in his heart, the mug was actually sacrificed and turned into a magic weapon.

No wonder it can maintain such a fresh appearance for tens of thousands of years.

As long as the magic weapon is not broken and has spiritual energy to nourish it, it will not change for tens of thousands of years.

He took the cup for a closer look, and suddenly, a string of numbers at the bottom of the cup caught his attention.

Leaving aside other things for the time being, there is a problem with the appearance of this number.

These are Arabic numerals, how could they appear in this prehistoric world, absolutely shouldn't!
And this string of numbers, or this string of serial numbers, is like a production date.

The number is written.

137621.7.19
July 13, 620?

Even a production date is somewhat mindless.

I don't know how this date is calculated. If we calculate it from the beginning of the world, it will be more than 13 years ago.

No, this cup is already tens of thousands of years ago, and when Sanhe found it, it might have been manufactured tens of thousands of years ago.

When calculating the number of years in the 21st century, it is only about two thousand and a few years.

After all, human civilization has only appeared for thousands of years in that era.

But the timeline span of this prehistoric world is too long!
Just thinking about it, suddenly the system sounded.

【Ding!It was found that traces of the previous traveler remained, and now the remaining traces are removed. The previous traveler has been wiped out by the system because he violated the rules of time travel. 】

【Ding!The system reminds again of the rules of traversal. The first rule is not to reveal the existence of the system to any living beings. The second rule is not to disobey the mandatory orders of the system. If you violate these two rules, you will be obliterated! 】

Lu Feng: ...