In fact, Xue Yi's method of killing the naked troll king was very simple, soul attack. When the naked troll king conveyed his first message to him, he had already discovered that although the naked troll king was strong, his soul was not too strong. It may be ten times stronger than an ordinary mid-level dragoon, but in front of Xue Yi's soul that has absorbed tens of millions of ghosts and golden points of light, it is not so powerful.

But Xue Yi didn't immediately kill the naked troll at that time. Because he knew that the mysterious man must be watching him from the side, and the purpose of the mysterious man must be to kill himself and obtain the fire core at the same time. So Xue Yi threw the fire core out, in order to lure away the troll, and also to lure the divine man to appear.

Sure enough, when he threw out the core, the mysterious man appeared and took almost all of his cores. It's a pity that the mysterious man flickered and appeared, and even with Xue Yi's eyesight, he never saw the face of the mysterious man clearly. He could only see that under the feet of the mysterious man, there was a cloud of transparent energy. It was precisely because of this transparent energy that the mysterious man's speed increased greatly, and even the naked troll king could not catch up with his speed. And when he finished collecting all the fire cores and disappeared, the transparent energy on his feet quickly spread to his whole body, enveloping him, and he disappeared into nothingness, and even Xue Yi's golden soul could not detect his existence.

However, Xue Yi can rest assured for the time being, because according to various signs, Xue Yi guessed that the strength of that mysterious person could only be an intermediate dragon rider at most, and he urgently needed to improve his strength quickly. So after the mysterious man obtained his own fire core, it is likely that he will find a place to absorb the fire core.

While Xue Yi was thinking. Suddenly I smelled a burning stench. It was a familiar smell to him, the scorching stench that came from the core of fire burning through their heads after the naked trolls died. Xue Yi looked at the naked troll king. I saw that at the junction of its two huge heads, a hole was burned through, and in the hole, a fire core that was a hundred times larger than an ordinary fire core appeared.

An ordinary fire core is the size of an eyeball at most, but this fire core is the size of a human head. Above the core of fire. Overflowing fire attribute energy. It is also a hundred times stronger than ordinary fire cores. The temperature of the fire core was extremely high, and Xue Yi was more than fifty meters away, and he felt that a heat wave was pressing. If you are an ordinary person, you can't get close at all.

Xue Yi's soul moved at this time and released the ice and snow dragon.

As soon as the ice dragon came out, it glanced impatiently at the almost fiery red air around it. Obviously uncomfortable with the scorching air. It speaks out of its mouth. He asked, "What do you want me to do in this kind of ghost place?"

Xue Yi smiled apologetically and said, "The temperature of this fire core is too high, please help me cool down." ”

The ice and snow dragon didn't say a word, opened its mouth, and a mouthful of icy cold breath erupted. But when its icy breath erupted, it reached five meters away from the fire core, and it was roasted and dissipated by the heat.

The Ice Dragon saw this. couldn't help but feel a slight anger, and the dragon power in its body surged. With the dragon power, he spewed out a breath of cold air. This time, with the help of the dragon power, the cold qi did not dissipate again, and directly wrapped the fire core, instantly freezing its outer layer.

The ice and snow dragon was still not at ease, and another breath of cold breath spewed out, wrapping the fire core heavily, it already looked like a one-meter diameter ice ball, and then it said: "It's okay, I'm going back, this ghost place, if it's not necessary, don't call me out." With that, it burrowed into the space on its own.

After the ice and snow dragon entered the space, Xue Yi sat down cross-legged in place, waiting for the core of fire to cool down. Such a large fire core, if it is absorbed after it cools down, it will definitely help him be promoted to a high-level dragoon.

In this extremely hot place, the ice melts extremely quickly, and even with the dragon power of the Ice Dragon, the ice still melts faster than the ordinary ice blocks outside. The one-meter-diameter puck melted in less than an hour to less than an inch thick.

At this time, Xue Yi only heard a soft click, and when he looked down, he saw a crack on the one-inch-thick ice. Then the crack grew larger, and soon it was completely cracked.

At this time, look at this fire core, it is like a translucent fiery red glass ball the size of a human head. In the center of it, it can be seen that there is also a fiery red magma-like material, and it is clear that the inside of it has not been completely cooled. However, Xue Yi absorbed it from the outside first, such a large fire core, and when it was absorbed inside, it had already cooled.

Xue Yi's soul scanned the surroundings, then released the Evil Spirit Dragon, the Purple Electric Tyrannosaurus Rex, and the Ash Dragon, letting them guard around for him, and then he slowly closed his eyes. In his hands, a fiery red dragon power poured out at the same time, flying towards the fire core. A moment later, the dragon force enveloped the fire core in its entirety.

After Xue Yi wrapped the fire core with the fire attribute dragon power, the soul controlled the fire attribute dragon power and tried to penetrate into the fire core. But the texture of this fire core was extremely hard, and even if Xue Yi divided the dragon power into extremely fine filaments, it would be difficult to enter it.

However, Xue Yi could feel that after its dragon power enveloped the fire core, the fire core was slowly decomposing at an extremely slow speed. Although this process of decomposition was extremely slow, so slow that ordinary souls could not detect it at all, only a golden soul like Xue Yi could barely feel it. But this is enough to make Xue Yi happy, after all, progress is better than no progress.

After more than an hour, only a trace of the fire core disintegrated. Xue Yi immediately absorbed the decomposed fire core into his body, and then used dragon power to refine it, and after a while, this fire core was completely turned into energy and replenished into his dragon power.

Xue Yi could clearly feel that just absorbing this trace of energy was more than his previous ten days of cultivation. So he continued to absorb the fire core.

This absorption process lasted for a long time, and during this time, the three dragons kept guarding by Xue Yi's side. The surroundings were also quiet, and there was nothing else to disturb Xue Yi.

More than two months later, Xue Yi had absorbed the fire core to the middle part. And that part was already cooling when he absorbed the outer layer.

In the process of cultivation and absorption, time passed imperceptibly, and after another month, the fire core in front of Xue Yi was finally absorbed. At this moment, there was a soft ding sound in his body, and another fiery red crystal was condensed.

Xue Yi was overjoyed in his heart, but he didn't open his eyes, but continued to absorb dragon power from the purple electric Tyrannosaurus Rex and the ice and snow dragon in the space. Just a moment later, two more clanging sounds were heard in him.

At this time, Xue Yi looked inward, and saw that there were three rows of crystals lined up in his body, a row of white crystals with ice attributes, a row of purple crystals with a thunder attribute, and a row of fiery red crystals with a fire attribute. There are three crystals in each row, which represents Xue Yi's level, and since then he has been promoted to a high-level - a high-level dragoon!

From being promoted to an intermediate dragoon to the present, only half a year has passed, but Xue Yi has been promoted from an intermediate dragoon to a senior dragoon. If you tell someone else, I'm afraid no one will believe it. After all, when the strength reaches the level of the dragoon, the level is extremely slow, and if an ordinary dragoon wants to be promoted to the next level, it will take at least ten years or even decades. Even above the history of the continent, it took five years to be promoted from the intermediate dragoon to the high-level dragoon to the fastest Thunder Emperor Thunder Yutian. But Xue Yi only took half a year, which is really too appalling.

Of course, the Thunder Emperor had never encountered such an adventure as Xue Yi back then. It was precisely because Xue Yi encountered a fire core the size of a human head that he was promoted to a high-level dragoon.

At this time, Xue Yi stretched out his right fist and punched out of thin air, when he punched, the fist rubbed against the air, and on the surface of his fist, there was a layer of fiery red flames, which shows how strong Xue Yi's strength and speed were at this time. He hadn't used dragon power yet, so you can imagine how strong it would be if he threw a punch with all his might.

Moreover, Xue Yi has enhanced not only his strength, speed and dragon power, but also his soul can exert fifty percent of its power when he upgrades. The soul can probe for thousands of miles.

At this time, his soul detected that there was a looming figure seven or eight thousand miles away from him. Xue Yi didn't pay attention to the looming figure, but continued to sit there cross-legged, condensing his dragon power.

Having just been promoted to a high-level dragoon, the dragon power will inevitably overflow, so that the opponent can easily see his strength, and he will not be able to exert his full strength in battle. Therefore, it is necessary to use the soul to absorb the dragon power into the body and let it slowly solidify.

This process lasted for another five days or so, and only then did Xue Yi open his eyes. At this time, he has changed compared to when he was just promoted. Five days ago, his breath overflowed all over his body, and he looked extremely imposing, but he couldn't restrain it. And five days later, from the outside, he was no longer that strong, but the dragon power in his body was more condensed, and with one punch, the strength was at least twice as strong as five days ago.

At this moment, Xue Yi's soul moved, and he had already swept the figure towards him. At first, the figure had been exposed outside, but after a while, when the figure was more than five thousand miles away from him, the transparent energy on the person's body enveloped him again, so Xue Yi's soul could no longer detect the person.

But Xue Yi was not panicked because of this, but a faint smile appeared on the corner of his mouth, and then he simply took his soul back.

About ten minutes later, Xue Yi's soul suddenly moved, slowly opened his eyes, and said in the direction of the left, "You are here." ”

The person who was quietly approaching Xue Yi in stealth listened, and suddenly paused, and looked up at Xue Yi not far away with a surprised face. (To be continued......)

PS: Thank you Xuan for the magical tip, thank you. Here is a preview that there will be an update on the National Day.