The North Desolate Grave was located in the central region of the Great Thousand World. In ancient times, there was also a vast supercontinent here, known as the North Desolate Continent. But not only was the North Desolate Continent not barren, it was practically the most flourishing and powerful region in the Great Thousand World.
But when the Fiend Clans invaded the Great Thousand World, the Great Thousand World was forced to retreat. At the crucial moment, the Immortal Emperor stood out and formed an alliance with the Great Thousand Palace to resist the Fiend Clans. Only then did the Great Thousand Palace stop the Fiend Clans from collapsing.
Thereafter, the Fiend Clans fought with the Great Thousand World, and the Immortal Emperor fought with Tian Xie in the North Desolate Continent. In that battle, the supercontinent was destroyed, and the remaining region became the North Desolate Grave.
The battle ended with the Heavenly Evil Monarch being sealed, and the North Desolate Grave was sealed by the Immortal Emperor's Tomb Guardians, which forbade anyone from approaching. Naturally, not even Heavenly Sovereigns dared to step foot in such a dangerous place, so no one dared to come.
Only during the Great Thousand Alliance Treaty that happens once every thousand years would the Great Thousand Palace send out a Great Thousand Invitation, inviting all the Heavenly Sovereigns of the Great Thousand World to gather in the North Desolate Grave and activate the seal left by the Immortal Emperor to erase the Heavenly Evil Monarch's life imprint.
The Great Thousand Alliance Treaty was too high, so ordinary forces and lifeforms in the Great Thousand World naturally couldn't come in contact with it. Only those that knew the inside story knew how important the Great Thousand Alliance Treaty was.
The peace of the Great Thousand World depended on it, and the slightest carelessness would result in destruction.
After all, the fear that Tian Xie had left in the Great Thousand World was too deep. Even after tens of thousands of years, there were still records of it.
Back then, the Immortal Emperor had risked his life to seal Tian Xie, and if Tian Xie managed to escape, then there wouldn't be a second Immortal Emperor in the Great Thousand World right now.
"This is the North Desolate Grave?"
The three streaks of light tore through the spatial turbulence and broke through the layers of astral winds and clouds. In the next moment, a shattered continent appeared in their sights.
The continent was tattered with a crimson lustre. Even from such a distance, they could vaguely sense a terrifying aura soaring into the sky.
The three silhouettes retracted and revealed themselves. They were Mu Chen, Qing Yanjing, and Luo Li.
At this moment, Mu Chen was looking at the continent with curiosity. Evidently, he was interested in the battlefield between the Immortal Emperor and Tian Xie.
Standing to the side, Qing Yanjing nodded her head with a grave expression. She had fear in her eyes as she looked at the Desolate Grave. She could sense a terrifying aurlingering on the continent.
That kind of aura made even a Saint Grade Martial Ancestor like her feel a sense of oppression.
"What a terrifying place."
Mu Chen sighed as he stared at the dark-red land. For some reason, as he approached this place, he felt a little fearful. That's because he could sense an indescribable dangerous aura.
Just a trace of that aura made his scalp go numb.
"This is the place where Tian Xie was sealed. Despite being sealed, there's still a remnant aura emanating from him. But fortunately, the Immortal Emperor had set up an array to suppress it. Otherwise, not even a Saint Heavenly Sovereign would dare to step into the North Desolate Grave." Qing Yanjing glanced at Mu Chen.
Nodding his head, Mu Chen's expression changed just when he was about to speak. He raised his head and looked into the distance. The gale was torn apart and several silhouettes flew out, emanating powerful Spiritual Energy fluctuations. They were all Heavenly Sovereigns.
Evidently, as time approached, all the pinnacle powerhouses that received the Great Thousand Invitations were making their way over.
The few Heavenly Sovereigns had naturally sensed Mu Chen's group of three and swept their gazes over with revere on their faces. They cupped their fists and flew towards the North Desolate Grave.
"Looks like I've gained some fame in the Great Thousand World."
Looking at their silhouettes, Mu Chen couldn't help smiling. He could naturally sense their revere for him. Evidently, the few of them had recognised him.
"They're clearly revering Aunt Jing. What has it got to do with you?"
Seeing the slightly complacent look on Mu Chen's face, Luo Li could not help raising her rosy lips as she teased.
Mu Chen froze and pretended to fiercely glare at Luo Li. However, the latter wasn't afraid at all. On the contrary, she chuckled. Her clear and sweet-sounding laughter made Mu Chen's heart itch.
Looking at the couple, Qing Yanjing smiled. "But Chen 'er has gained some fame now. The matter in the Maha Continent has caused a commotion, and all the Heavenly Sovereigns in the Great Thousand World know that you're the successor of the Primordial Immortal Body. Even Maha Tian couldn't do anything to you."
Mu Chen laughed. He wasn't concerned about fame, he just wanted to tease Luo Li.
"Let's go, we'll go down as well."
Waving his hand, Mu Chen descended towards the North Desolate Grave. When he approached the sky, his silhouette briefly paused with a grave expression.
That's because he could sense a terrifying pressure emanating from the North Desolate Grave. It was as if a boundless power would annihilate him if he had any evil thoughts in his heart.
"Be careful, this is a seal left behind by the Immortal Emperor."
Qing Yanjing's grave voice resounded, "Not only has this seal sealed Tian Xie, but it has also formed a layer of defence around the North Desolate Grave. Any Fiend Clans that approach will be annihilated by the seal.
"As for us, we only need to relax our bodies and use our Spiritual Energy to protect ourselves."
Hearing this, Spiritual Light surged around Mu Chen's body and protected his body. Thereafter, he felt the terrifying pressure rapidly dissipating. Only then did he breathe a sigh of relief.
"What a terrifying power. With such a defence, how would the Fiend Clans dare to come here?" Mu Chen sighed.
However, Qing Yanjing shook her head. "The Fiend Clans are bizarre. Although this seal is terrifying, they're not pushovers, either. We can't underestimate them."
Mu Chen nodded his head. At this moment, they had already descended above the North Desolate Grave. When he looked down, he was briefly stunned.
On the broken ground, there were numerous lone tombs that used mountains as tombs. The mountain tombs continued on endlessly, stretching all the way to the end of one's sight.
"These are the experts that fell in the ancient war." Qing Yanjing said with a solemn expression.
Mu Chen's expression was grave as well. Since they could be buried here, then they must be famous. With so many tombs, one could imagine the price that the Great Thousand World paid in the ancient war.
Since those experts sacrificed their lives to protect the Great Thousand World, they're worthy of their respect.
Whoosh!
As Mu Chen sighed, two grey lights shot over from the distance. A few breaths later, they appeared before them, revealing two grey-robed middle-aged men.
The two of them were skinny without any expression on their faces. But judging from the Spiritual Energy fluctuations emanating from them, the two of them were actually in the Spirit Heavenly Sovereign Realm.
"We greet Grand Elder Qing Yanjing, Abode Ruler Mu Chen, and Holy Maiden Luo Li." The two grey-robed men's faces were stiff as they cupped their fists towards the three of them.
Mu Chen swept a glance at their chests. There were tombs embroidered on them, which made them look desolate. His gaze flickered when he figured out their identities. The two of them should be the guardians of the North Desolate Grave.
It was rumored that the guardians were the direct descendants of the Immortal Emperor. Back then, when the Immortal Emperor fell, they stayed in the North Desolate Grave to guard the seal.
In terms of strength, not even the Five Ancient Clans could be compared to these guardians. However, they strictly followed the rules and never took a step out of the North Desolate Grave. Thus, even Mu Chen felt a trace of respect for them.
Thus, facing the two of them, Mu Chen also cupped his fists.
"Please follow us."
The two guardians still had indifference on their faces, but when their gazes swept past Mu Chen, there was a peculiar ripple in their eyes.
However, they did not speak a word and turned towards the depths of the North Desolate Grave.
Mu Chen's group of three immediately followed up.
Layer after layer of tombs swept past beneath their feet. This continued for around ten minutes before the two tomb keepers finally slowed down and descended to the ground.
Mu Chen directed his gaze downwards and saw an incomparably massive black plaza on the ground. On the black plaza, there were numerous black pillars erected. The pillars were mottled, but as he got closer, his pupils suddenly narrowed. That's because, at this moment, he realised that those weren't black pillars, but huge bronze coffins erected on top of them.
These coffins seemed to be extremely sharp nails that were firmly nailed into the black plaza. Faintly, there seemed to be a strange fluctuation radiating from them.
As Mu Chen's gaze swept across those coffins, their positions appeared in his mind. They were all connected to each other. Then, a formation that emitted a boundlessly terrifying might slowly appeared in his mind.
He gently sucked in a breath of cold air. He finally understood that those coffins were the seal left behind by the Immortal Emperor. In that case, Tian Xie should be sealed in the depths of the black plaza.