Ye Qingyu's words made Liu Shaji light up with excitement.

Through the gate of the sword tower, the inside was seen glowing brightly. The inside was an empty s.p.a.ce, and evidently some kind of very clever s.p.a.ce formation. It was like a huge training ground, there were racks of weapons, platforms, military tents, as well as traces of airs.h.i.+p ports and docks. Compared to the black traces outside that had been burned by Emperor fire, the sword tower inside was in a much better condition. There were only faint marks of fire damage and smoke around the objects and weapons.

At the end of the military ground was a set of black steps leading up to the top.

The steps were marked with traces from various battles before, as well as swords, spears, battle-axe and various weapons inserted into the steps.

“It's all Emperor weapons.”

Although these weapons had lost their spiritually, the law and power contained within were completely destroyed, and the rusty marks and stains were no different to that of a pile of sc.r.a.p metal, Ye Qingyu could still tell that these weapons were once Emperor weapons. Unfortunately they were destroyed in the war, and perhaps even their masters were killed in battle.

The tragicness of the battle back then can easily be imagined.

The battle in this black sword tower was much more tragic than it was than the outside.

All the way up the black stairs, they came to a stone door, which was a transportation formation that was still functioning to this day. Ye Qingyu pressed one hand against the stone door, activating the surviving formation. The inside of the door flashed blue light, waves rippled out and the formation re-emerged.

The trio was transported to the second floor of the sword tower.

This second floor was still a military training zone, but even more intricate. If the first floor of the sword tower was to train ordinary soldiers, then the second floor was used to train the elites in the army.

From the size and scale of these two training grounds, one can vaguely guess how impressive the military power of this black ancient castle in its flouris.h.i.+ng period was. It was indeed more magnificent and militarized than the twenty-one Cities of Chaos that exist in the Vast Thousand Domains today. It was most likely a reverent ancient city army back then.

The trio people climbed up eighteen floors in a row, pa.s.sing all kinds of training s.p.a.ces.

Even Ye Qingyu felt surprised.

The black sword tower looked more like a military camp with terrifying military strength acc.u.mulated, and along the way, not only did they see broken Emperor weapons, but also dried-up skeletons, similar to divine gold or immortal iron. With one glance it was clear that these skeletons were, before death, absolute top martial arts experts that had dominated one side, but had died long ago, at least millions of years.

The ancient city was a complete militarized place.

Ye Qingyu carefully observed all kinds of traces, becoming more and more confident with his speculation.

In the end, after walking through the one hundred and seven stone doors in a row, the trio came to the 108th stone gate——In this black ancient sword tower there was a total of one hundred and eight gates, which further confirmed Ye Qingyu's speculation.

“What place is this? Such terrifying battles had happened here.” Liu Shaji sighed, inwardly puzzled and confused.

Ye Qingyu came to the last stone door, which was more magnificent than any stone gate before. It was three or four hundred meters high, and the doorframe was engraved with many ancient characters, which were patterns that Liu Shaji had never seen before. But Ye Qingyu was able to recognize the origin of these characters right away.

“There was a betrayal here,” Ye Qingyu stated.

He looked around to see a lot of corpses in this s.p.a.ce, ancient remains piling upon each other like a mountain. It was obvious that the worst battle had happened on this floor. He could roughly imagine that this s.p.a.ce was the last line of defense during the fierce battle between the guardians and the intruders that happened in the ancient black castle. The last and worst battle took place here.

“Your Majesty already knows what happened here?” Liu Shaji looked at Ye Qingyu with curious eyes. “

Ye Qingyu nodded. “If my guess is right, the owner of this ancient castle is called Ye Chongsheng, also the creator of the Dark Realm and the twenty-four cities of the chaos region of the Vast Thousand Domains. Back then there were many Lords of the Cities of Chaos that were his people. He can be said to be the ruler of the Vast Thousand Domains. Although his reputation is not particularly well-known throughout the long history, he had still dominated an era.”

“Ye Chongsheng?” Liu Shaji was taken aback for a moment, and then shook his head. He had not heard of the name before.

Ye Qingyu nodded, and did not say much.

Ye Chongsheng had once said that when he almost ruled over everything, he encountered a betrayal and everything he operated and managed was destroyed in this betrayal. The mastermind of this betrayal was precisely the Sky Emperor who had been hiding in the shadows since ancient times. Everything was toppled, and since then, the Sky Emperor also began to manipulate and dominate everything in the dark, including the Guardian camp of the Dark Realm. However, all this was in fact within the calculations of Ye Chongsheng. He deliberately faked death in this betrayal and reincarnated. During this betrayal, although many of Ye Chongsheng's arrangements were destroyed, the real core plan was in fact unaffected.

These things were what Ye Chonsheng said to Ye Qingyu in the Black Demon Abyss maze.

However, at that time, when Ye Chongsheng mentioned this matter, it was just a kind of memory of the past for him, and Ye Qingyu's attention was also focused on the matter itself, but he had never thought about how tragic the betrayal was and that it happened in such a place. Not to mention the fact that it was related to the ancient twenty-four Cities of Chaos that disappeared.

This was what Ye Qingyu deduced from a number of ends and clues after entering the black ancient castle.

As a result, the former twenty-four Cities of Chaos became twenty-one cities. The mystery of the missing ancient City of Chaos was finally unmasked.

The last stone door was obviously the last barrier.

Even Liu Shaji could tell that the enemies who invaded here were unable to break through this stone door. In other words, when the betrayed forces of the Sky Emperor attacked this stone gate, they were blocked and unable to advance any further. In the end, the Sky Emperor burned the entire castle with the underworld fire, but still failed to destroy it completely and had no choice but to retreat resentfully.

The black castle then entered into the turbulence of time and s.p.a.ce, which might have been the means of the Sky Emperor, or could have been an arrangement of Ye Chongsheng.

The formation characters on the stone doors were precisely the unevolved one hundred eight ancient characters.

Ye Qingyu had seen the whole deduction process of the one hundred eight ancient characters on the tombstone in the ancient fiendG.o.d city of the Black Demon Abyss.

Therefore, this stone gate that the Sky Emperor had never managed to break through, was nothing for Ye Qingyu. He activated a formation technique and easily reopened the stone gate.

What was behind the stone gate was not a military training ground.

Singing birds and fragrant flowers, a distinct and beautiful world appeared before the three people.

“Who is it?” In the distance, two figures sped over, roaring from afar.

Ye Qingyu smiled, “Finally found you guys.”