In this ultimate form, the speed, strength, and defense of the Underworld King will be greatly improved, but it can only be maintained for a period of time, not for too long.

As everyone was amazed, the entire underground world had undergone earth-shaking changes. All the buildings disappeared, replaced by an endless ocean of magma.

In the vast ocean of magma, two figures are opposed to each other. They are the Lord of Thunder and the Lord of Demon Slayers. These two people invariably look higher up.

In the void, floating on the left side is Fairy Zixia, while on the other side is the Underground King glowing with red light.

The shape of the underground king today is completely different from before. The skin of the whole body is translucent, which is the image of a true underground person.

And on his body, there is a human-shaped phantom that is completely condensed by the energy of the earth's core, ten meters high, shrouded in it.

This huge humanoid phantom, holding a large earth fire knife, is lifelike, and the temperature it emits is unimaginable.

The light was shining, and the entire imperial capital was now full of murderous air.

Now the twelve iron cities and the mountain walls before the imperial capital have all been wiped out by magma, and the entire space has become even more empty.

All the soldiers retreated to the central area, watching from a distance, their hearts trembled, and they did not dare to come closer.

"The breath has become stronger." The Demon Slayer squinted slightly, feeling a little surprised. After all, in the realm of Emperor Wu, it is very difficult to improve the breath.

And just now, when the Underground King was fighting with Fairy Zixia, his breath plummeted and his body was also injured.

But now that the "Ultimate Form" is turned on, not only has his aura rise to its peak, but even the injuries on his body have completely disappeared.

"That human being, this king will join hands with you." The Underground King first said to Feng Wuhen. There was no anger in his voice. Instead, it was a kind of domineering domineering over the world.

This sentence is shocking for a moment.

The Underworld King actually wants to join forces with humans?

Could it be that even if the "Ultimate Form" is opened, the Underground King still has no confidence in defeating Fairy Zixia?

"Okay." The Thunder Lord only responded with one word. This was the situation he wanted to see.

"Yuejun, let the anti-imperial army temporarily go and fight against foreign invading enemies." The Underground King ordered that the reason why he and Feng Wuhen joined forces was not to be afraid of Fairy Zixia.

But he knew in his heart that there was a gap between him and Fairy Zixia.

The "Ultimate Form" can only last for half an hour, and he has just broken through to Emperor Wu's realm, and his foundation is unstable. If he rashly uses the ultimate energy of the bloodline, it may hurt the foundation.

But right now, in order to deal with Fairy Zixia, the Underground King has no other choice.

"You are the female emperor, this king underestimated you, you really let this king see the power of mankind." The underground king's personality has undergone a 180-degree change, and the whole person has completely calmed down.

However, under his calmness, there is more violent energy.

If the underground king just now was just a crazy tiger. But now he is a tiger who has awakened from a deep sleep, and he is not the same.

"It seems that you are quite confident in your strength, let this palace take a look." Fairy Zixia said coldly.

As soon as the voice fell, the underground king's gaze changed, and his right hand waved instantaneously.

In an instant, the entire magma ocean vibrated, and then, a series of magma pillars with a diameter of 100 meters burst out from the magma ocean.

These magmas were not ordinary magmas, they were all fires in the heart of the earth, and then condensed into a 10,000-meter-long, lifelike earth-fire dragon, which directly penetrated the void and blasted towards Fairy Zixia.

As you can imagine, the "elementalization" of Fairy Zixia was performed very timely. When the local fire dragon penetrated her body and passed, she had already turned into a gas and dissipated.

However, what is surprising is that the fire dragon did not knock down the magma ocean, but instantly reversed its direction and flew to the right.

The speed of the Earth Fire Dragon reached a thousand times the speed of sound, and a buzzing sound erupted in the void.

When everyone couldn't understand what this earth-fire dragon was about to do, a surprising scene appeared!

In front of the fire dragon flying, the void was distorted, and then, the body of Fairy Zixia unexpectedly appeared.

But only in the blink of an eye, the fairy Zixia that was about to appear, once again turned into an element and disappeared.

Perhaps in the eyes of the others, this is a coincidence, but all the martial arts present, including the demon-killing holy master and thunder holy master, showed shocked faces.

"what!?"

This was obviously not a coincidence, but the Underground King was able to clearly capture where the Zixia Fairy, who had been dissipated by the use of "elementalization," appeared.

This scene is too weird. You must know that Fairy Zixia's spiritual consciousness has reached the sixth stage, and the underground king's spiritual consciousness has only the peak of the fourth stage. How could he know the place where Fairy Zixia "elementalized" appeared in advance? ?

However, what happened next, they had to be convinced.

No matter how Fairy Zixia uses "Elementalization" to disappear, the Earth Fire Dragon can always capture her position.

"Flee, this king wants to see how many more times the immortal energy in your body can be used for elementalization." The Underground King stood in place, controlling the Earth Fire Dragon, and said calmly.

"What's going on?" Everyone was dumbfounded, looking at each other, how did the Underground King catch the breath of Fairy Zixia?

At the same time, on the ruins of the iron city outside the imperial capital, the wild fierce demon also pointed at the three Xiao Wenhao and cursed: "Isn't it cool to beat Laozi? Try it now!"

The three of Xiao Wenhao gritted their teeth, because Yuejun and others had already set their sights on them.

In just a moment, the situation reversed, and they, who originally had the advantage in numbers, are now facing eight martial masters!

"Marshal, the group of traitors escaped." Bai Ge immediately reminded Jun Jun.

Yuejun and the others looked around and found that Lin Yun, Rijun, and Mo Cheng had already flown far away, obviously not wanting to intervene in this battle.

Yuejun was incomparably entangled in his heart, he was thinking about whether to capture the high-level anti-imperial army or stay to deal with these outsiders.

At present, the high level of the anti-imperial army is exhausted, as long as he is given a few more minutes, he will definitely be able to take it all down.

But now the Underworld King has ordered him to deal with the outsiders first, which makes him feel very entangled.

After a lot of thought struggles, Yuejun still ordered: "Deal with foreign enemies first, this is the king's order!"

As the subordinates of the Underworld King, they had no choice. Although Yuejun had so much hope in his heart that he could kill his brother here, he still had the command of the Underworld King.