"Yes, the tall buildings rise from the ground, and it looks so rewarding, and when the city wall is completed, I will start to rebuild the building inside the sunset."

'The obsidian walls are indeed strong, but if you go underneath the central tower where the sun never sets, you might find more. 'Xiu Ruo seems to have no idea, and threw out an opinion.

Shen Yanxiao raised his eyebrows slightly, Xiu seems to know a lot about the sun never setting? She didn't ask much, and directly followed Xiu's words and came to the central tower where the sun never sets.

The tower stands in the very center where the sun never sets, and after so many years of wind and frost, although it has been somewhat dilapidated, it has largely retained its original appearance.

Walking into the tower, the black steps were scorched black, and Shen Yanxiao searched for a possible entrance to the underground, and finally found a hidden passage under a broken stone statue of the Demon God.

Entering the passage, Shen Yanxiao took out the condensing crystal to illuminate the surroundings, the narrow corridor could only allow one person to pass, and the damp walls around it made people feel extremely cold.

The narrow corridor seems to have disappeared so far, and it spreads infinitely down with a circular staircase.

Shen Yanxiao didn't know how long she had walked, and when she finally felt a little tired, the stairs finally continued to the end.

At the end of the staircase, a quaint stone door stood in front of her, and the two sides of the stone door were carved with exquisite patterns, and after thousands of years, it still showed the exquisite skills of the craftsmen to the visitors.

'Push it away.' 'Fix the opening at the right time.

Shen Yanxiao stepped forward, took a deep breath, and spread his arms to try to push open the stone door.

However, this stone gate that does not seem to be big is like a 10,000-ton boulder, and Shen Yanxiao has spent a lot of effort and failed to push it in the slightest.

"I'll go! What is this made of, so heavy! Shen Yanxiao rubbed her sore wrists, she concentrated all her strength on both hands, but she couldn't push open the stone door, you must know that her current strength is not difficult even if she breaks the stone wall with one punch.

'Put your hands on the door, I'll come.' Xiu Lengqing's voice sounded.

Shen Yanxiao followed his words and put his hands on the stone door.

In the next second, she seemed to feel a pair of somewhat cold hands covering her hands, and a trace of coolness came from the palms of her hands, but she couldn't see anything.

Squeak.

The stone door was slowly pushed open, and Shen Yanxiao's eyes widened in surprise.

The coolness disappeared from her hand, and Xiu withdrew his strength.

Holding the condensing crystal, Shen Yanxiao walked into the stone gate.

It has been sealed for thousands of years, but there are still torches burning inside the stone gate.

Inside the stone door is a huge basement, the entire basement is formed in a circle, and on the surrounding walls, there are torches burning with cyan flames.

There was no air, no fuel, and the torches were still swaying.

'This is the underground energy source on which the sun never sets, see that black crystal in the center of the room?' ’

Shen Yanxiao looked at the black crystal in the center, it was the size of a person's head, like a dusty pearl, dim, even if the flames around it were swaying, it did not leave the slightest reflection on it. It was like pure black, absorbing the light around it.

"What is this?" Shen Yanxiao walked over and picked up the dim crystal.

The crystal was not small, but its weight was exceptionally light, and Shen Yanxiao picked it up with almost no effort.