The death energy in the ancient city fluctuated violently.
Ye Chen's expression changed when he saw the obviously increased death energy. He didn't dare to hang around outside anymore and hurriedly hid in the Weapon Refining Hall.
"Roar!"
A huge low roar sounded again, and a terrifying pressure erupted from the ancient city.
At this moment, the entire ancient city was trembling.
Ye Chen felt a strong sense of crisis in his heart, as if some terrifying existence was about to appear.
"Is there a powerful being hidden in this ancient city? Is it the King of the Dead?"
Ye Chen's expression changed slightly, and as his spiritual consciousness spread out, Ye Chen seemed to feel a powerful aura appearing below the ancient city.
This powerful existence seems to be sealed, but just the escaped breath is powerful enough.
"There's something strange underneath this ancient city!"
Ye Chen took a deep breath, and a solemn look flashed in his eyes.
Since this ancient city is located in this desert, then there may be some creatures sealed underneath this ancient city, most likely powerful undead spirits.
Ye Chen once saw in the desert that these dead energy will merge into the desert before dawn.
There may be a lair of the undead down here.
Were these undead kings just calling for the powerful existence below this ancient city?
"Is it because I sealed the undead king that it caused these undead kings to riot?"
Ye Chen was vaguely suspicious.
He killed a lot of undead that night, at least thousands of undead. Adding these two undead kings, it is not incomprehensible that these undead kings rioted.
"It seems that we can no longer go out to kill this undead king."
A wry smile appeared on Ye Chen's face.
"Roar!"
At this time, the roar below the ancient city became louder and louder, and the rich death energy rose into the sky, threatening to tear the ancient city apart.
Boom!
The walls of the ancient city suddenly lit up with bright lights. Under the impact of this powerful existence, the ancient city revived!
Powerful auras erupted from the ancient city, as if they were about to tear the entire space apart.
Streams of sword light and fist seals soared into the sky, as if they were about to be completely revived.
"Roar!"
A low roar came from below the ancient city, as if it was colliding with the ancient city.
After a while, the pressure gradually disappeared, as if it was suppressed by the ancient town.
Afterwards, the ancient city returned to calm again, as if nothing had happened.
But no one in the ancient city dared to make any move.
Ye Chen took a deep breath at this time and took out the Dragon King Furnace.
Although the two undead kings were taken into the Dragon King Furnace by Ye Chen, they were not completely dead.
Still retains a trace of consciousness.
The first thing Ye Chen has to do is to refine these two undead kings.
Otherwise, the Dragon King Furnace may not be able to suppress them for too long.
"Burn!"
With a thought, Ye Chen directly mobilized the flames of the fire spirit and began to burn the two undead kings.
The powerful divine fire burned the death energy around the Undead King, and there was a violent collision in the Dragon Emperor Furnace. The two Undead Kings were frantically hitting the Dragon Emperor Furnace, trying to break out of the furnace.
But under the burning of the divine fire, these two undead kings were eventually burned to ashes!
As the death energy dissipated, only two pure soul bodies remained.
A jingle!
With the fall of the Undead King, two black crystals appeared in the Dragon King Furnace. Under the burning of the divine fire, these two black crystals were not damaged at all.
Ye Chen's face changed slightly, and with a thought, he took out two black crystal-like objects from the Dragon Emperor Furnace.
"What is this?"
Ye Chen frowned and stared at the black crystal carefully, but he didn't find what material the black crystal was made of.
However, Ye Chen still noticed a strong death aura from this black crystal.
It's like the main god's godhead that Ye Chen obtained before, but slightly different from the godhead, the power in this black crystal is not very strong, and it doesn't seem to be used to enhance strength.
"Since this thing fell from the body of the Undead King, it should have a great effect on the Undead. Could it be the core of the Undead King's power?"
Ye Chen looked at the black crystal in his hand carefully, and had some guesses in his mind.
However, if you want to verify Ye Chen's idea, you still need to do some experiments.
Ye Chen took one of the black crystals and carefully walked out of the restriction.
The undead in the whole street rioted.
The next moment, countless dead souls rushed towards Ye Chen, aiming directly at the black crystal in Ye Chen's hand.
Ye Chen's expression changed slightly, and he subconsciously retreated behind the restriction.
Bang bang bang!
There was a sound of collision, and countless undead crazily hit the restriction, trying to rush towards Ye Chen, and then were killed by the power of the restriction.
In just one breath, hundreds of undead souls were restrained and killed.
Ye Chen's expression changed and he hurriedly put the black crystal into the dragon pattern ring.
After losing the breath of the black crystal, these undead spirits stabilized, no longer hitting these restrictions, and scattered in all directions.
Ye Chen squinted his eyes, and a strange color flashed in his eyes.
This black crystal is too attractive to these undead.
If Ye Chen guessed correctly, this black crystal should be the most critical thing for the undead to evolve into the undead king.
Otherwise, these unconscious undead spirits would not have rushed over so fearlessly, even suppressing their fear of the restriction.
"But this black crystal only has some effect on the undead. This black crystal seems to have no effect on me."
Ye Chen frowned, and suddenly his eyes lit up.
"The four dark demon gods in the realm of Hades seem to be somewhat similar to these undead spirits. Although they were resurrected with the help of the Nine Netherworld Qi, they may also need this black crystal."
A flash of emotion flashed in Ye Chen's eyes.
With Ye Chen's current strength, he is no longer too afraid of the powerful Dark Demon to seize his body.
If this dark demon improves his strength with the help of this black crystal, it will also be a great help to Ye Chen.
Ye Chen's mind moved, a black halo was released from Ye Chen's body, and four dark demons slowly emerged from the realm of Hades.
Ye Chen took out a piece of black crystal from the dragon pattern ring. The next moment, the four dark demon gods all looked at the black crystal in Ye Chen's hand. The aura around them fluctuated violently, and their eyes were full of greed. p>
Obviously, these four dark demon gods really want the black crystal in Ye Chen's hand.
Ye Chen hesitated for a moment, then threw the black crystal to the nearest dark demon.
The dark demon suddenly opened his mouth and swallowed the black crystal into his belly.
As the black crystal was swallowed, the Dark Demon God suddenly trembled violently, and streams of strong death energy erupted from the Dark Demon God's body.