Xue Yi took out another box, which was still full of blood crystals. However, the aura of the fire element emanating from this blood crystal was not the aura of the fire element, but the aura of the water element.

The ice attribute dragon power in Xue Yi's body was infused into this blood crystal, and the blood crystal suddenly exuded an ice element aura. Bingshui is originally a family, and the transformation is very simple, especially Xue Yi once obtained the core combat power of the Water Emperor and knows water very well, so the transformation is also easy.

Then he released the Ice Dragon, and threw the transformed Ice Attribute Blood Crystal to the Ice Dragon, and after absorbing it, the Ice Dragon also became a subdragon with a body length of 200 meters.

Next, the Wind Dragon and the Purple Electric Tyrannosaurus Rex also reached a body length of two hundred meters. Especially the purple electric Tyrannosaurus rex, after the body length reached two hundred meters, the two huge heads looked left and right, looking full of the aura of the king, and there was a faint purple electric light on the body, worthy of the title of purple electric Tyrannosaurus rex.

At this time, Xue Yi already had five wurm species with a body length of two hundred meters.

Just imagine, with five wurms with a body length of 200 meters, how kind of wind would it be?

These five dragons are all more than two hundred meters long. Xue Yi knew from the souls of those five people that two hundred meters was the difference between the sub-dragon species and the sub-dragon species. The general sub-dragon species can only grow to more than 100 meters at most, and it is impossible to exceed 150 meters. The wurm species, on the other hand, can easily grow to 200 meters, and after growing to 200 meters, its lifespan is also increased tenfold.

Sub-anmorphs can only live up to a hundred years, while wurms can live to more than two thousand years. Correspondingly, of course. Its Dragon Knight lifespan can also be increased tenfold. In other words, Xue Yi's lifespan will be at least two thousand years old. Even if he can't break through his strength after that. But with the dragon power of these wurms, he can live to be two thousand years old.

Xue Yi put the remaining blood crystals into the space at this time, and he roughly calculated that there were still ten boxes of fire attribute blood crystals in the space, and there were more than eleven boxes of water, thunder, and wind attribute blood crystals.

With the value of this blood crystal, it can be exchanged for a lot of things that Xue Yi will need in the future.

At this time, his soul moved, and he planned to jump on the dragon's back. Fly towards the Holy City of the Killing Continent.

But at this moment, Xue Yi's face suddenly changed, and his soul swept a hundred miles down. I saw it on the sea and in the sky for hundreds of miles around. A circle of black shadows appeared. This circle of black shadows is a circle of killing dragons.

Recalling what he saw in the light curtain, Xue Yi knew that it was not good, and there was no way to escape at this time. The Slaying Dragon has surrounded itself.

However, Xue Yi has experienced many dangers. Know that the more dangerous it is. The more calm you are. His face was solemn, and after a slight groan, he retreated towards the palace. At the same time, he included all the dragons in the space. Although these dragons are now sub-dragon species, it is not a problem to deal with these sub-dragon species that are no more than 100 meters long. But the problem was that there were too many killing dragons, and no matter how powerful those dragons were, they would inevitably end up being buried in the killing dragon army, so Xue Yi wouldn't let them fight against the killing dragon army at all.

However, Xue Yi did not retreat to the main hall, but passed through the side hall. Go to the rooms where you just picked up the books and blood crystals.

The killing dragons outside were overwhelming, and Xue Yiruo was standing in the open space. It's easy to be attacked by a horde of killing dragons, so he has to find as narrow a place as possible to keep the number of killing dragons he faces as little as possible each time. And those rooms were the narrowest places Xue Yi found, with the body of a killing dragon being more than thirty meters long, and a room could only accommodate one killing dragon at most.

Moreover, Xue Yi tried, the four walls and roof of this room are all made of dragon crystals, which are extremely hard, even if they are strong enough to kill the dragon, it is impossible to break the four walls and the roof in a short time.

Soon, Xue Yi had already retreated to the study, and then used the transparent-colored Yuan Force formed by the fusion of the four dragon powers to spread a layer of light around the room that was half a meter thick.

Xue Yi secretly smiled bitterly, the dragon rider Venerable's two-meter-thick light shield couldn't withstand the attack of the killing dragon, and now his half-meter-thick light shield was just for show.

He set up his mask and faced the door. The door is the most easily damaged in this room.

Ready for all the battles, he began to think. Why did all these slaying dragons suddenly gather towards the palace?

It is likely that when a few of his own dragons evolved, they were sensed by those killing dragons, so they gathered here.

Now that they've discovered themselves and gathered here, they must find a way to escape. However, judging from the situation on the light curtain, this overwhelming army of killing dragons is only an outpost, and there are still large troops waiting on the periphery. Even if you escape from here, it will be difficult for you to escape from the encirclement and suppression of the outer army.

While Xue Yi was secretly thinking about it, his soul had already detected that hundreds of killing dragons had entered the palace from all sides of the palace. They sniffed with their noses all the way, looking for Xue Yi's hiding place. Soon, he came to the door of Xue Yi's study.

On Xue Yi's hands, there was a secret condensation of Yuan Force, and two transparent clouds of Yuan Force were ready to be sent out at any time.

At this time, those killing dragons had obviously smelled where Xue Yi was, and suddenly they were like crazy, and their tentacles kept stabbing towards the four walls of the room, and with each stab, the room would make a rumbling sound, as if it was about to collapse.

But that's all, they stabbed for more than ten minutes, and the room was not damaged at all.

Xue Yi was surprised in his heart, the destructive power of these killing dragons would not be so weak. The light shield in the light curtain was two meters thick, and it was also laid by the Dragoon Venerable, and it was only broken in less than ten minutes. Now this light shield is only half a meter thick, and the killing dragon can't even break it?

However, Xue Yi soon understood that the light mask he had laid was using Yuan Li. He now knew that Yuan Li was a power that was a hundred times stronger than ordinary dragon power. In addition, although there are many killing dragons here now, the room is only so big, and there are only two or three killing dragons that can attack the light mask, so it is naturally much slower.

Thinking of this, Xue Yi secretly made up his mind that in the future, he must use Yuan Li. Yuan Li is his greatest magic weapon.

But the most important thing for now is to get out of here first.

But just as Xue Yi was thinking about it, the light shield in the direction of the door suddenly clicked and a crack was blasted open.

Xue Yi was shocked in his heart, and hurriedly output the Yuan Force in his hands to the light mask, and the crack had already closed before the next attack of the killing dragon arrived, under the repair of the Yuan Force.

Xue Yi was even more surprised by the strength of this Yuan Force in his heart.

However, although the place was closed, the killing dragon already knew that it was the biggest weakness after the attack just now, so he concentrated its tentacles and stabbed there.

Suddenly, the sound of clicking continued to sound, and the cracks on the light mask instantly increased.

Xue Yi waited intently, and the light of Yuan Force was condensed on his hands again.

At this moment, there was a loud click, and a hole the thickness of an arm suddenly shattered on the light mask. In the hole, a tentacle pierced in, swinging wildly. As the tentacles swung, the hole quickly grew. At this time, no matter how Xue Yi input the Yuan Force, the light mask could no longer be repaired. Xue Yi simply stopped inputting Yuan Force into the light, and focused all his attention on the entrance of the cave.

At this time, the hole in the light mask was already more than a meter in diameter, and the hideous head of a killing dragon slammed straight into the hole. Although the door was a hundred times harder than the ordinary door material, under the top of this killing dragon, it was also instantly cracked, and sawdust was splashed everywhere.

The killing dragon was obviously extremely excited, and opened its mouth to roar.

At this moment, before those sawdust landed, the Yuan Force light in Xue Yi's hand suddenly lit up and blasted out of thin air. Suddenly, the transparent Yuan Force energy directly blasted into the mouth of the killing dragon.

Boom -

The head of the killing dragon exploded directly, and flesh and blood flew all over the sky. Xue Yi's right hand moved, and a layer of dragon power light shield wrapped himself to avoid being corroded by the blood of the killing dragon.

As for the headless killing dragon corpse outside the door, because of the power of the explosion, it was directly blasted out of the opposite wall, knocking out a big hole in the wall made of dragon crystals.

Xue Yi clenched his fists again, and the light of Yuan Force appeared on his fists again. He was slightly surprised in his heart, the destructive power of this Yuan Force was far beyond his imagination.

In the end, he relied on the dragon control technique to control the killing dragon, and now, he didn't use any skills at all, just bombarded with pure energy, and the killing dragon was killed. In addition to the increase in strength, this yuan power is also many times stronger than the original dragon power.

While Xue Yi was thinking, several tentacles probed into the cave. Xue Yi didn't say a word, and another punch of Yuan Force blasted out.

Boom -

A loud but loud explosion rang out, and the killing dragon was once again blasted to slag.

But soon, another dragon slaying came, and the hole grew bigger and bigger.

Xue Yi kept punching with both hands, and the Yuan Force continued to blast out, so that gradually the Yuan Power in his body became less and less, and finally it was completely exhausted in the end.

At this time, Xue Yi's soul moved, absorbing dragon power from the dragons in the space. But as soon as he absorbed it, Xue Yi immediately noticed the difference. At this time, the amount of dragon power he absorbed was more than ten times greater than in the past, and it was completely changed in terms of quality. The original dragon power only purely emitted various colors of light, but now the dragon power, in the light, has several fingernail-sized points of light constantly swimming.

Xue Yi could feel that within these points of light, there was a huge amount of energy. (To be continued......)