The ancient world was silent, with only the heavy breathing of the young man and the occasional painful groan coming from him.
On the other side, the outside world was in chaos.
A black and white dragon of fire flew out of the ancient city's space, the people in the outside world were shocked at first before they faced a disaster.
"Is this the Yin-Yang Holy Flame?" Those strong enough amongst them were surprised to see this long lost flame, they saw the huge dragon composed of fire, it was hundreds of feet long and exploded before their astonished eyes.
The next moment, the overwhelming flames turned into a sea of fire that enveloped an area of 100 miles, and then a large strange black fog spread from it.
"No, this is the black fog of the Yin side." Before everyone could react, the black mist was approaching.
"Everyone, hurry up and use your Dou Qi to protect your body! This thing is dangerous!"
The black mist was pervasive, the elders of the Black Wind Sect were most familiar with the horror of this thing, and their faces changed drastically.
As soon as he finished speaking, a Dou Emperor cultivator who had been contaminated by the black mist screamed.
A short while after, he was covered with red hair, his eyes turned dark red, his bones twisted violently, and his face became evil and terrifying.
In less than a quarter of an hour, this Dou Emperor was completely transformed into a red-haired monster that only knew how to kill. He roared and began to attack his companions.
"Everyone! Run!" someone exclaimed, and hurriedly used their fastest speed to escape to the distance.
Hearing this person's shout, everyone also left quickly, but there were still several Dou Emperors and a Dou Ancestor expert who were accidentally contaminated by the black mist.
The several Dou Emperors almost instantly grew red hair all over their bodies. The Dou Ancestor strongman did not change at first. Just when he was about to breathe a sigh of relief, he found that his body hair had turned red.
"Roar!" A Dou Emperor-level Magical Beast roared and attacked a Dou Venerate present.
"Courting death!" The Dou Venerate shouted, and then he blew the monster into a blood mist with a casual blow.
However, the next moment, a black gas left the dead body of the Dou Emperor and quickly flew towards him.
"I want to see what's so weird about this." The Dou Venerate old man sneered, he used his strong Dou Qi to seal the black air.
Soon, his face changed drastically.
The terrible black fog had begun to penetrate his Dou Qi, and in the blink of an eye, his originally blue Dou Qi was dyed black.
The Dou Venerate old man did not dare to continue to entangle with the black fog at this moment. He waved his hand to disperse his Dou Qi and retreated at the fastest speed he could muster.
"What kind of strange black fog is this? Even a Dou Venerate can be infected by it?" The experts who had fled into the distance looked back at the terrible black fog with a trace of fear in their eyes.
Dou Venerates, to them, is already the most powerful existence they can see in their lives. Unexpectedly, even such existence is afraid of the black fog and can do nothing to it.
At this moment, the black fog has spread to a radius of 100 miles with the explosion of the Yin-Yang Twin Flame Dragon. Wherever it passed, all living creatures became crazy and bloodthirsty. Even plants have dark lines on their bodies, and there are signs that they are about to crawl out of the soil.
If it is allowed to spread, it will not take long before the area within a radius of ten thousand miles will become a hell full of mindless slaughter, death, and destruction.
"The young master is still inside." Xiao Wen and Xiao Wu, who were in the ancient city, looked at each other and saw each other's worries. The two old women of the Yao clan beside them similarly had worried expressions on their faces.
"It's just some mere black fog, what can it do!" Xiao Wen's Dou Qi condensed in his palm and attracted a wisp of black fog.
The wisp of black fog struggled wildly in his palm, and there was a faint sign that it would infect his Dou Qi and turn it black. Xiao Wen snorted coldly, he condensed and fused the surrounding the spatial power with his Dou Qi to form a powerful boundary surrounding the black air.
The black fog was bounced back after touching the boundary wall. After hitting it dozens of times, there was a sign of it weakening. However, at the same time, the boundary wall also had a faint sign of being stained black.
Seeing this, even Xiao Wen's face couldn't help but become solemn.
This weird thing can not only pollute Dou Qi but also erode space. Even with his Half Saint power, he is finding it difficult to erase a wisp of the black air.
Even if he and Xiao Wu used up all their Dou Qi, they would not be able to wipe out even one tenth of the black fog that was currently covering a hundred miles. "If we want to deal with this thing completely, I'm afraid it will take a three-star Dou Saint powerhouse to suppress it for several years before it can be wiped out. Or, it can be wiped out bit by bit over the years by refining it with the top ten ranked Heavenly Flames on the Heavenly Flame Ranking."
Hearing Xiao Wen's words, Xiao Wu and the two old women of the Yao clan also looked solemn.
Obviously, this black fog is extremely terrifying.
"But although it is difficult to wipe it out, you and I can still temporarily restrain it for a while." Xiao Wen glanced at Xiao Wu, the two brothers nodded in tacit understanding.
The next moment, their raging Dou Qi burst out from their bodies. Their terrifying aura was like a deep abyss and an ocean, causing the bodies of the watching experts who were in the distance to tremble slightly.
"I didn't expect that these two were actually Half Saint powerhouses." A Dou Venerate had a complicated look on his face.
When the two Saints Wen and Wu as well as Xiao Yan appeared in Black Wind City that day, he had taken a peek but was driven away by Xiao Wu. He thought they were high-level Dou Venerates, but he didn't expect they were Half Saints.
Hearing his whisper, a group of Dou Ancestor and Dou Emperors of lower levels all swallowed their saliva and looked at the two old figures with awe.
"Let's do it." Xiao Wu waved his hands, his terrifying Dou Qi began to quickly attract the fire attribute energy in the surrounding heaven and earth.
Xiao Wen also attracted the terrifying water attribute energy, forming a sweeping energy tide.
In front of the great power of heaven and earth mobilized by the Half Saints, even the extremely weird black fog was quickly compressed and concentrated from all sides by the two terrifying energies.
As it was about to be sealed again, the black fog began to struggle frantically, but it still couldn't escape the means of the Half Saints in the end. It had been supressed by the Yin-Yang Evil Saint with the Yin-Yang Holy Flame for a thousand years, it was currently at one-tenth of its former strength.
Soon, this group of black fog that even Dou Venerates feared was sealed in an energy shield that had a 100 feet by the water and fire attributes of the two Saints.
The pair's dou qi attributes complemented each other, and they could hold out for a period of time when facing a one-star Dou Saint together. The energy shield they formed was naturally extremely powerful.
However, even so, this energy shield began to be penetrated bit by bit by the black fog.
"Reinforce the power of space," Xiao Wen shouted in a low voice, and the two began to mobilize the surrounding space power to integrate into the shield, combining with the energy in it to finally form a solid boundary wall.
The black fog struggled violently but was unable to break free again.
"Huuuuh!" Xiao Wen exhaled, sweat appeared faintly on his forehead.
"This seal should be able to hold for about a year."
After saying that, he turned his gaze to the ancient ruins again, ignoring the awe-inspiring gazes of the powerful people around him, and calmly stood in the air waiting. Seven days passed like this.
After seven days, the young man in the ancient city slowly opened his eyes.
"The first Heavenly Flame has been successfully refined!"
The whisper echoed in the ancient city. Deep in the boy's dark pupils, there were two flames, one black and one white, slowly jumping.