The three powerful Undead Kings were much weaker than the Old Tortoise. Now that they were heavily injured, they were like arrows at the end of their flight. Otherwise, the five sub-king undead creatures wouldn't have dared to attack the Undead Kings.
However, the Undead Kings were the Undead Kings after all. Even though they were heavily injured, they could still kill the sub-king undead creatures in an instant. The other two sub-king undead creatures were scared out of their wits. The soul fire in their skulls flickered continuously before they turned around and fled.
However, the consequences of offending the dignity of the Undead Kings were very serious. "Swoosh!" "Swoosh." Two rays of spiritual light shot out from the skulls of the Four-clawed Flood Dragon King and the Deity Race's undead king. In an instant, the two fleeing sub-king rank undead creatures exploded into pieces, their shattered bones falling to the ground.
The soul fires of the two sub-king undead creatures were also destroyed, turning into a sky full of flickering light. Powerful Soul Power surged out, gathering and devouring all the spiritual light that had exploded.
The difference between the strength of the Undead Kings and sub-king undead creatures was like the difference between heaven and earth. They couldn't be compared at all.
After devouring the soul fires of the two sub-king undead creatures, the soul fires in the skulls of the Deity Race Undead King and the Four-clawed Flood Dragon King became stronger.
Devouring the soul fires of the undead creatures allowed them to recover their strength. The cultivation system of the undead creatures seemed to be based on the path of plunder. They used the soul power of other undead creatures to strengthen themselves.
However, the Old Tortoise definitely wouldn't give them any chance to recover. How could the three Undead Kings, who were already exhausted and extremely weak, resist the Old Tortoise who had been conserving his energy?
The stone tortoise shell flew out of its hand and drew a terrifying ray of light. It was like a meteor streaking across the sky, illuminating the earth.
"Bang!"
The unstoppable, unstoppable, and unstoppable stone tortoise shell instantly smashed the Four-clawed Flood Dragon King's skull into pieces. The dazzling Soul Divine Flame in the skull also shattered under the impact of the blow.
The stone tortoise shell smashed out a second time, shattering the upper half of the Deity Race's undead monarch's skeleton and shattering its skull into thousands of pieces.
The soul flames within the skull also shattered into thousands of balls of spiritual light that flickered incessantly in the air like starlight.
Old Tortoise quickly absorbed the soul power that exploded. Old Tortoise's strength completely terrified the Corpse King, who only had half of its body left.
The two Undead Kings had been killed in an instant. They had not been able to fight back at all. This made the Undead King feel the threat of death.
The Undead Corpse King had already activated its intelligence. Without any hesitation, it surged with a terrifying corpse aura and soared into the sky, fleeing into the depths of the swamp.
"You still want to escape? Do you think you can escape?" The Old Tortoise sneered, then directly struck a palm towards the escaping Zombie King Seal.
Boom!
A vast power surged out of the old turtle's palm. The terrifying power shook the heavens and the earth. Endless white light illuminated the night sky, enveloped the earth, and dispelled the aura of death. The entire area turned from night to day in an instant.
The surging power swept through the world like a raging sea. The Corpse King, who only had half of its body left in the battle between the three monarchs, was directly smashed into pieces.
The area began to quiet down. Although there were many relatively weak undead creatures peeping in from a distance, none of them dared to step forward.
Even the sub-king rank undead creatures were mercilessly annihilated. The undead creatures peeping in from a distance were not even sub-king rank, so it was even more hopeless.
The Old Tortoise's palm turned into a claw and grabbed the air. A bead that emitted a demonic bloody light flew out from the Corpse King's remains and was sucked into the Old Tortoise's hand.
That was the corpse core condensed from the Corpse King's body. When things reached an extreme, they would move in the opposite direction. The Corpse King was an undead creature with an endless aura of death. However, inside the Corpse King's body, there was a corpse core condensed with a huge amount of life energy.
If one day, the Corpse King's cultivation base was strong enough, it could reverse life and death, dispel the aura of death on its body, and come back to life. Unfortunately, this Corpse King did not have that opportunity.
The Old Tortoise killed the three great Undead Kings with lightning speed. When Gu Fei rushed forward, the Old Tortoise had already collected the soul fire that exploded.
"Brat, your cultivation base has reached a bottleneck. I'll give this corpse core to you! After refining this corpse core, I believe you can break through your current bottleneck, "the Old Tortoise said and threw the corpse core that was as translucent as a blood agate to Gu Fei.
"Thank you very much, haha!" Gu Fei did not stand on ceremony. He took the corpse core and looked at it carefully. The corpse core was actually only the size of a pigeon's egg. There seemed to be blood flowing inside, emitting a layer of hazy bloody light.
There was no aura of death on the corpse core. Instead, it contained a huge amount of life energy. It was hard to imagine that the body of an undefeatable Corpse King could condense such a divine life pill.
"Let's go take a look at that hall!" Old Tortoise said. A head-sized soul fire was gathered in his palm. It was the soul fire of the two Undying Monarchs that had been smashed into pieces.
It was a shocking soul power, the source of power for the two great Undead Kings. The Old Tortoise did not want to waste any time. While refining the soul fire, he walked toward the hall in the distance.
When the man and the Old Tortoise were within a hundred feet of the hall, Gu Fei suddenly realized that he was no longer stepping on the soft turf. He felt like he was stepping on solid ground.
That's right, there was a kind of dark brown soil under his feet. It was hard soil. Gu Fei used all his strength to step on it, but the soil under his feet did not budge at all. It seemed to be even harder than rocks.
The pitch-black hall was like a primordial beast, lying in this lifeless and endless swamp. It emitted an endless ancient aura, appearing very abrupt.
There was no light in the hall in front of him. The surroundings were silent. What he smelled was a rotten smell from all directions.
The gray layer of Death Qi that shrouded the sky blocked the moonlight that shone down from the sky. The surroundings were very dark and gloomy. Although it was not to the point where one could not even see their fingers in front of them, Gu Fei could only see a few miles ahead with his eyesight. He could not see anything further than that.
The power that erupted during the battle between the three Undying Kings had dispelled the gray aura that shrouded the sky. Under the light of the moonlight, his field of vision was relatively clear.
But now, the dusky deathly aura once again shrouded the sky above the swamp. The moonlight couldn't penetrate it, and there were clouds of dusky deathly aura floating in the swamp from time to time. His vision was greatly hindered.
"This hall …" The Old Tortoise seemed to have noticed something, and his expression changed several times.
"What's wrong?" Gu Fei asked. With the Old Tortoise's knowledge, could it be that he knew the origin of this hall? Gu Fei could not help but feel puzzled.
"We'll know after we go in and take a look!" The Old Tortoise said and strode forward.
"Rumble …" The ancient door of the hall was pushed open with a heavy sound. Gu Fei was surprised to find that the door of the hall was actually a pair of thick and heavy stone doors.
The stone doors seemed to be made of a rare black stone. Gu Fei tried to push them, but the stone doors were extremely heavy. Even with his 500-kilogram strength, he could not move them at all.
Upon entering the hall, he saw that the hall was empty without any furnishings. The pillars in the hall were all black, and they were a shiny black color. Even the floor was black.
It was strange that the hall did not seem to be used for living, nor was it used to worship a Demon God. This was because there was no statue of a Demon God in the hall.
The Old Tortoise suddenly stood still in the middle of the hall, and then swallowed the extremely large amount of Soul Fire that he had gathered in his hand.
Gu Fei cautiously looked around the hall, but did not find anything out of place. Moreover, the death aura in the swamp did not appear in the hall.
The death aura was blocked outside the hall.
While Gu Fei was bewildered, he suddenly heard a muffled thud beside him. There was a tremor under his feet, and Gu Fei almost jumped up from the sudden sound.
"Bang!" There was another sound.
Gu Fei suddenly turned around and saw that the Old Tortoise had taken out its stone turtle shell, which could smash anything, and was smashing the floor with all its might.
The dark floor seemed to be flowing with a layer of black light, as if there was a flow of power. The Old Tortoise's stone turtle shell could not smash the floor of the hall for a while.
"This … what is he doing!" Gu Fei was inexplicably shocked.
"Bang!" "Bang!" "Bang!" "Bang!" "Bang!" …
The Old Tortoise swung the stone turtle shell, causing the entire hall to shake. The hall was sturdy beyond imagination, but under the impact of the stone turtle shell, the hard floor began to crack.
An hour later, the floor of the hall was completely broken. To Gu Fei's disbelief, there was something strange under the floor of the hall.
When the broken floor was cleaned up, a huge mysterious formation appeared in front of Gu Fei and the Old Tortoise. Lines of mysterious engravings formed endless ancient talismans, flowing with a faintly discernible light. There was a faintly discernible light flowing around it, and an ancient and desolate aura assaulted his senses.
The gigantic formation covered the entire hall. Gu Fei vaguely felt that there seemed to be a faintly discernible power flowing on the formation.
Of course, before the floor was broken, it was difficult for Gu Fei to detect the fluctuation of this power with his cultivation level. However, it was obvious that the Old Tortoise had sensed it.
No one would have thought that there was a huge mysterious formation hidden under the floor of the nameless ancient hall that suddenly appeared in the swamp. The formation seemed to have an ancient history, which was too shocking.
It seemed that someone did not want others to discover the formation above the hall, so they used a layer of hard floor to cover the mysterious formation.
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