Time passed, and in the blink of an eye, it was three years later.

At this time, somewhere under the Beiyuan Sand Sea, a crater with scorching white fireworks was tirelessly emitting a terrifying high temperature.

However, unlike the tens of thousands of years in the past, these terrifying high temperatures emitted by the white flames did not emanate from the yellow sand crystals on the top, but when they rose to a height of three zhang, they were attracted by a square sunken cave, and nearly ninety percent of the high temperature emitted by this igneous rock pit fell into it.

Square hollow**, a stiff black figure sits cross-legged, his eyes are closed, and his figure is quiet.

The only movement in his body is his lower abdomen, which rises and falls regularly with every breath he takes through his mouth and nose.

"Humph......"

"Hoo ......"

The hot breath turned into white gas, wisps of it entered the stiff body, and then after circulating in it, it was exhaled again, turning into a warm vapor.

Not far from the stiff man, Stiff Er lay in a corner of the cave, its ears propped up, moving from time to time.

It appears to be asleep, but in fact it is on a certain alert.

In the three years that Zhuangda found this igneous rock pit and then fell into retreat in preparation for transforming into an ironclad corpse, it was Zhuanger who was protecting the Dharma.

The Beiyuan Sand Sea is incomparably vast, and the monks rarely set foot on it, and there are not as many demon beasts here as in other places, but Zhuang Er knows the importance of this Great Zombie Retreat, so Rao is slightly simple-minded, and he has to fight his spirit, overcome the fatigue of his physical instinct, and become the Dharma Protector for three years.

In the past three years, there have been several experiences of sand poisonous scorpions breaking in, but they were all resolved in time by the Zombie 2 Institute, and did not have any impact on the stiffness of the retreat.

Although the temperature emitted by this igneous pit was terrifying, it would naturally not have any effect on the Zombie Er, who was already a third-order high-grade demon beast, and there was no adverse reaction in his body except for making it feel a little uncomfortable.

As a frog, it still prefers a warm and slightly humid environment.

With his eyes closed, he let out his senses, and after passing through the cave, he continued to explore outside, preventing monsters from lurking here in advance.

I thought that this time was another ordinary exploration, but soon Zombie Er discovered that something was wrong, and the igneous crater, which was already active on weekdays, became more active at this time, and even some sporadic white flames had jumped to the height of the cave.

Finding this abnormality, Stiff Er, who had closed his eyes for a long time, opened his eyes, exhaled two white breaths from his nose, turned his head slightly, first glanced at the still calm Stiff, and then set his eyes on the outside of the cave.

The head lifted up a little and left the ground, but there was no next move.

A glimmer of light swirled in his eyes, and he wondered if he should get up and go out of the cave to check, after all, it was the first time in three years that this igneous crater had such a violent reaction.

Just as it hesitated, an abrupt crunch came to its ears.

Cracking sound!

In an instant, his eyes refocused on the stiff man who was sitting cross-legged, because the sounds just now were coming from him.

The breath becomes heavier, and more and more hot air enters the body through the mouth and nose.

In just half an hour, the surface of the stiff body was already covered with a layer of red visible to the naked eye.

This meant that his body was at an extremely terrifying temperature at this time.

Stiff Er stared intently, not knowing what to do for a while.

And the stiffness over there has progressed to the next stage.

The surface of the clothing was burned and turned into a mass of black-gray ashes, and some black-red streaks appeared on the bare skin, in addition to the crimson.

The black-and-red streaks were not fixed, but swirled around the stiff body, mainly on his chest, abdomen, and back.

"Roaring ......"

"Roaring ......"

Two low, short roars came out in a row, and Stiff Da's face was hideous at this time, and the two fangs that were usually hidden in his mouth also reappeared, his neck swelled, and his meridians burst out.

Obviously, Rao's strong body is a stiff three-grade corpse refining body, and he is also suffering greatly in this state.

He had been cultivating the Flying Feather Golden Corpse Decision smoothly before, and it was only at this moment that he felt the bottleneck of this high-level exercise.

"Roaring ......"

"Roaring ......"

Two more roars, accompanied by a stiff and high bulging lower abdomen, dense black and red streaks had spread all over his body, and a faint hint of bright red appeared in the center of each streak.

At this time, Zombie Er was no longer lying on his stomach, but stood up, staring at Stiff with blazing eyes.

The white flames of the fire crater outside the cavern had boiled to the extreme, and a small white tornado of the flames gathered appeared, and then all poured in from the stiff mouth in an extremely exaggerated state.

Accompanied by a stiff and undulating chest and a fully swollen body, a strong and oppressive aura appeared, and was released outward from its center.

The air was shaken by this breath, forming a wave of qi, in which the stiff whiskers were blown up, and the mane on the back of the neck also danced.

As the rage, rage, calamity, and coldness contained in this breath in his perception became more and more obvious, Stiffer's body automatically produced a layer of pale cyan wind whirlwind a few inches outside his body as a resist.

Gradually, the wind that vibrated the breath became bigger and bigger, and some small stones and gravel in the cave were also integrated into it, and what was more obvious was that Jian Er felt a unique breath of gold and iron from this breath.

This state of stiffness continued for almost an hour, until the white flames in the flint pit outside the cave were about to be extinguished, and the changes in his body and the aura that raged outward began to show signs of slowing down.

After waiting for another two hours, Stiffer was vigilant against the abnormal movements around him, and the redness around Stiff Da's body had subsided, his whole body was quiet again, his breathing became even, his eyes were not open from beginning to end, and his face was calm.

In this regard, there was a trace of doubt in Zhuanger's eyes.

It was a little confused that it had just experienced such a big fluctuation when it had just stiffened, but now it was the same as before, as if nothing had happened.

With such suspicions, Stiff Er still cautiously continued to guard for two days, until the third day, Stiff Da, who had been sitting for three years, finally opened his eyes again.

The pupils were dark, and there was evil qi inside, and as a long turbid breath was exhaled, the stiffness gradually returned to clarity.

got up from the ground, moved his body casually, looked down, his body seemed to have not changed from three years ago, but in fact, as the main body, the stiffness knew that the body of three years ago was completely incomparable to his current body.

As soon as he clenched his fist, an aura belonging to the third-order upper grade was revealed, and then his figure suddenly increased by three inches, the flesh and blood in his body boiled, and the shallow layer under his skin also showed a faint color of black iron.

Feeling the vigorous power coming from the body, the stiff operation of the flying feather golden corpse was stiff, and a different way of spiritual power was rotating in the body.

He turned his head to look at Tsuji, who was already approaching, and reached out and placed the palm of his right hand on top of its head.

In the latter's wide-open eyes, he slowly exhaled a breath of turbidity again, a smile appeared on his face, and patted the top of Stiff Er's head with his hand.

......

......

A black light escaped from the North Source Sand Sea, and after getting out of the extreme edge of the Sand Sea, he stopped his body, identified the direction, and then continued to fly away towards the southeast.

That was where Shuangjiao City was located.

It took nearly five years to complete the cultivation of the Flying Feather Golden Corpse Battle, and successfully completed the transformation of his own iron armored corpse with the help of the natural igneous rock pit in the Beiyuan Sand Sea.

And not only that, but he also took advantage of the opportunity of his body transforming into the flesh and blood of the iron-armored corpse to become more tenacious, and broke through the bottleneck of cultivation in one fell swoop, and the grade changed from the third-order middle grade to the third-order upper grade, which is equivalent to the late stage of foundation building for human monks.

While feeling the majestic spiritual power brought by the new realm, the flying stiff man blocked the whirring wind in his ears because of the high-speed flight.

With the strong physique of the iron-armored corpse and the consciousness of being able to fight independently, after spending a little more time to enrich the cultivation of the third-order upper grade, his strength is no less than that of ordinary late-stage foundation building monks, and even in some cases, he can still win.

......

......

It took more than a month for Zhuangda to return to Shuangjiao City from the Beiyuan Shahai again.

He landed directly on the hill where Li Xuangang's cave mansion was located, and then took out the token to open the prohibition of the cave mansion.

Looking around, the furnishings in the cave have not changed, and even a thin layer of dust has fallen.

"It seems that His Excellency is not out of the customs yet. ”

After making such a judgment, Zhuangda waved his hand to open the prohibition of the cave mansion again, and then cast a spell to open the boundary source space.

As soon as the entrance to the space appeared, a clear spirit immediately poured out from that end, and he was slightly stunned, and then raised his feet and walked in.