"Could it be that this guy also has a desire for the fire of Nirvana?"

Thinking of this, Lin Xiu couldn't help but smile bitterly, but he didn't hesitate any longer, his figure moved, and he directly appeared on top of the head of the mad demon black dragon like a ghost, and the fist wrapped in the fire of Nirvana slammed into his head.

In the face of Lin Xiu's attack, the mad demon black dragon who was in the weak period was unwilling to retreat, and the dragon's tail flicked, colliding with Lin Xiu's fist.

"Bang!"

Between the collision of the two, the two flames suddenly dented in a slight arc, and then surged violently, shaking the space into a few pitch-black cracks.

The strong strength also made Lin Xiu and the mad demon black dragon each retreat some distances, the latter raised his head to the sky and roared, the dragon sang a song, and an extremely terrifying purple-black flame pillar was sprayed towards Lin Xiu.

Seeing the pillar of flames spraying out, Lin Xiu also sneered, even if the Mad Demon Black Dragon only had one-tenth of the strength of his peak state, he would turn around and run away at this moment, but unfortunately, the former's current state was less than one percent of what it was in its heyday.

The pillar of fire dilated sharply in the pupils of his eyes, and when he was about to enter the range of his body, Lin Xiu's mind moved, and the fire of Nirvana quickly turned into a raging wall of fire in front of him.

"Whoa!"

The purple-black pillar of flame slammed into the red wall of fire, and the two finally collided head-on at this moment, frantically releasing their terrifying destructive power.

Lin Xiu was also shocked, the flame of Nirvana was the strongest flame of heaven and earth, and its power was naturally terrifying, but he didn't expect that the purple-black flame of the mad demon black dragon looked like it was not weak at all.

Fortunately, Lin Xiu's control of the Nirvana Fire had reached the point of perfection, and although the wall of fire fluctuated rapidly, it remained stable no matter how the mad demon black dragon burned.

The stalemate between the two lasted for about a few minutes, and the purple-black flame pillar was finally gradually weakened by the exhaustion of the mad demon black dragon.

Looking at the slightly sluggish mad demon black dragon, Lin Xiu's eyes flashed with light, and the fire of Nirvana suddenly dispersed, and at the same time, several jade bottles appeared in his hands, and they were thrown towards the purple-black pillar of fire that had not completely receded like lightning.

"Bang bang!"

As soon as the jade bottle came into contact with the mad demon black dragon, it burst open directly, and some snow-white liquid splattered out of it.

Snort!

As soon as these liquids came into contact with the purple-black flames, bursts of white mist burst out, and in the mist, there was a cold current that was cold to the bone.

Although the white mist quickly dissipated due to the high temperature of the purple-black flames, Lin Xiu's hand undoubtedly made the mad demon black dragon even worse, and the pitch-black flames on his body finally completely changed back to the purple-black color before.

"It's now!"

Just when the pitch-black flames that swirled around the body of the mad demon black dragon turned purple-black, a flash of essence suddenly flashed in Lin Xiu's eyes, and between the spatial fluctuations, the figure disappeared strangely, and when it reappeared, it had reached the place of the mad demon black dragon dragon's head.

Appearing, Lin Xiu grasped the palm of his hand, and a small jade bottle appeared in his hand, and then it was thrown out by it like lightning, and finally hit the forehead of the mad demon black dragon fiercely, and with a bang, it burst open, and a drop of golden-red blood slowly appeared.

When that drop of golden-red blood stained the forehead of the mad demon black dragon, its body suddenly stiffened, and the look in its eyes also appeared sluggish at this moment, at the same time, on its forehead, a strange Fu seal loomed out, looking at the appearance of the Fu Wen, it was exactly the same as the dragon seal in Lin Xiu's palm!

"Sure enough, it's a dragon seal!" Seeing the strange rune on the forehead of the mad demon black dragon, Lin Xiu suddenly flashed a touch of ecstasy.

"Boom!"

Not long after the strange dragon mark appeared on the forehead of the mad demon black dragon, Lin Xiu, who was in ecstasy, found that the dragon mark in his palm gradually became hot, and at the same time, an extremely mysterious induction suddenly appeared in his heart.

Soon after this mysterious induction appeared, Lin Xiu was stunned, and immediately stared at the mad demon black dragon in front of him, at this moment, he seemed to be able to faintly feel the latter's emotions.

"Roar!"

Just when Lin Xiu was stunned by this kind of change, the mad demon black dragon that had been stunned for a moment because of the appearance of the dragon seal also regained its consciousness again, at this time it seemed to understand something, in the dragon's eyes, the cold ferocious light suddenly shot out, staring at Lin Xiu deadly, and the dragon mark on his forehead was getting brighter and brighter.

Facing the fierce gaze of the mad demon black dragon, Lin Xiu's heart was also terrified, he knew that the most dangerous time was coming.

As the Heavenly Charm Fox said, this dragon seal is relative, if you can't control the mad demon black dragon, then you will be controlled by it, although what you have in your hands is the dragon emperor dragon seal, but due to impurity and insufficient strength, the risk is extremely high, and this kind of accident is impossible for Lin Xiu to allow it to appear anyway.

"Come on, I want to see, where can you kill me?"

At this time, it is already the only choice between life and death, and Lin Xiu is also not a good stubble, and the fierce light in his eyes is sweeping at the moment.

The mad demon black dragon raised its head to the sky and let out a roaring dragon groan, and the dragon mark on his forehead suddenly burst into black light, like a dazzling black sun, rising in this void land.

As the light of the dragon seal on the forehead of the mad demon black dragon became more and more brilliant, the mysterious sense in Lin Xiu's heart was also getting stronger and stronger, and after a while, a flower suddenly appeared in front of him, and his spirit was in a trance, and when he reappeared, it was already an extremely unfamiliar space, where there were purple-black flames all around, and he was in the middle of this endless flame.

"Idiot!"

In the purple-black flame space, there was a sudden sound of angry dragon groaning, and then the wind howled, and an unusually large dragon slowly rose from the sea of fire, and then entrenched in the sky, looking at Lin Xiu in the sea of fire with cold eyes.

Lin Xiu's gaze was firmly fixed on the giant dragon with purple and black flames rising all over his body, and after a while, he took a deep breath of hot air, and he already understood in his heart that this was the soul world of the mad demon black dragon, and it wanted to be here to gain the dominance of the dragon seal, so as to control him.

"Clash of souls?"

Lin Xiu raised his palm, glanced at the slightly illusory palm, on his face, it was an ancient well without waves, his mind moved, the vast soul power spread, his dark eyes stared at the mad demon black dragon in the sea of fire, and sneered: "If there is any trick, use it!"

Hearing this, the mad demon black dragon suddenly let out an angry roar, and under its roar, in this space, the purple-black flames suddenly soared wildly, and then surged towards Lin Xiu overwhelmingly, such a momentum was extremely terrifying.

In the face of the crazy attack of the mad demon black dragon, Lin Xiu's face was unusually calm, at this time, it is not only the soul that fights, but also the will, who can hold on to the end, then he is the final winner, these years of experience have given Lin Xiu the tenacity and calmness of the mountain, if you really want to fight, who will die, it is still unknown!