Orange flames are extremely rare, let alone yellow and green, which have never been heard of in the Federation.

In fact, the Force flame has been getting deeper and deeper recently, from a light red a few years ago, to a deep red now, and the temperature is close to a thousand degrees when it is running at full strength!

This is the benefit of cultivating the nine-star exercises, the thermal warriors of the Federation, most of their flame temperatures are three or four hundred degrees, it is difficult to increase, if there is no special opportunity or method, it will be red until death.

However, if Xin Lin wants to be promoted to the orange flame, it will be difficult to do so in the short term, and according to the normal cultivation progress, he will at least reach the Martial Saint realm.

At this time, Augustus said: "The easiest way to strengthen the nature of the Force is to use vacuum crystals with special attributes for cultivation. You are a thermal warrior, and your current cultivation is not very profound, so don't use too good quality thermal energy crystals, just use fire source crystals. ”

"Fire Source Crystal!"

Xin Lin nodded, he knew that the vast majority of vacuum crystals were attributeless, they were crystals of vacuum energy, and any Force warrior could use them, and this was the case with artificially created crystals.

There are also some extremely rare vacuum crystals with peculiar properties and functions, which are basically naturally generated, born in a strange environment in the universe, and their value is much higher than that of ordinary vacuum crystals. For example, the fire source crystal mentioned by Augustus is a rare vacuum crystal, and the energy it contains can only be absorbed by thermal warriors and transformed into the Force.

The most significant function of the Fire Source Crystal is to strengthen the properties of the Force and increase the temperature of the Force flame.

It's just that there is one point, the fire source crystal is too expensive!

Xin Lin had seen someone sell fire source crystals in the Super Energy Center and the Rainbow Gong Club, a fire source crystal with a standard energy degree, its content was almost the same as that of an artificial crystal, and the amount of force that was cultivated in the end was the same, but the price was as high as 700 million, which was more than twice as expensive as an ordinary vacuum crystal.

In other words, one fire source crystal can be exchanged for more than two vacuum crystals, and it can't cultivate more Force, and using it to cultivate is actually a loss.

However, the supply of fire source crystals is still in short supply.

There is no origin of fire source crystals in the Federation Star Domain, and the number of fire source crystals that flow into the Federation from aliens every year is not much, maybe only two or three thousand, which are rarely circulated in the market, and occasionally appear, they are also looted.

This made Xin Lonely very helpless.

Strengthening the nature of the Force is a long-term thing, it is not something that can be done with just a few pieces of fire source crystals, it must be cultivated for a long time, accumulate effects, and finally make the Force achieve a qualitative change, from red to orange.

With Xin Lone's cultivation speed, he could consume more than a dozen fire source crystals in a day, spending more than 10 billion, where could he get so much money?

Even if there is so much money, it can't buy enough fire source crystals, and the supply of the entire federation is only two or three thousand yuan a year, even if you cultivate all for yourself, it won't be gone in half a year.

Of course, the most important thing is that he has no money!

Augustus saw Xin Lone's difficulty, laughed, and said, "I know a few ways to strengthen the Force, but I don't have to use Fire Source Crystals, and one of them is very suitable for you." ”

Xin Xiao hurriedly asked, "What method?" ”

"The fire source crystal is generally produced from the ore veins deep underground, and there may be high-energy fire pools in these ore veins, and the energy of this high-energy fire pool is very special, which is similar to the fire source crystal. If you cultivate with the help of the hot environment of the fire pool, the nature of the Force will be significantly strengthened, and with your cultivation speed, the effect will be faster than using the Fire Source Crystal. Augustus said unhurriedly.

"High Energy Fire Pool!" Xin Silence suddenly perked up, "This place is not easy to find, right?" ”

"That's right, high-energy fire pools are rare." Augustus nodded and said, "Not all fire source crystal veins are accompanied by high-energy fire pools, and not all fire pools can be used, some of them are too high for ordinary people to get close to, let alone cultivate." ”

"However, you have a singularity star core, and you have cultivated the "Nine Yang Divine Skill", you can resist higher temperatures than others, and you can use a lot of overheated fire pools, which is very beneficial to you."

Xin Xiao thought about it and frowned, "If I want to use the high-energy fire pool to cultivate, I have to go to the origin of the fire source crystal." ”

He immediately searched for relevant information, and the results were not good.

There are not many planets in the galaxy that produce vacuum crystals, but they are not rare, most of them are vacuum crystals without attributes, and the places that can produce special crystals are extremely important resource areas, almost all of which are in the hands of the Galactic Empire.

And there are less than ten places in the entire galaxy where the fire source crystal is produced, and the closest to the Earth Federation is a planet called Flame Scale Star!

"Flame Scale Star, I've heard of this planet, it seems to be the source of the Federation Fire Source Crystal." Xin Silent muttered to himself, opening the information of the Flame Scale Star.

A huge colorful image of the planet is projected, and the data next to it shows that the planet is located in the Sagittarius spiral arm, 4,127 light-years away from Earth!

"So far ......"

Xin was stunned for a moment, if he set off from the Orion spiral arm where the earth is located to go to the Flame Scale Star, he would have to travel in the direction of the silver heart, crossing the sparse stellar area between the spiral arms. The Federation's spaceship only has a first-class warp speed, and it takes at least half a year to travel through such a distant interstellar space, which is a very long voyage, and it is dangerous to pass through the countries of many civilized races on the way.

Luckily, he has an inverse entropy star that can teleport directly to the Flame Scale Star, avoiding the biggest trouble.

Pyrrhus is a very peculiar terrestrial planet, generally the volume of terrestrial planets is comparable to Earth, with a diameter of between a few thousand and 10,000 kilometers, or smaller like Mars, even the largest "super terrestrial planet", the diameter will not exceed 30,000 kilometers.

But the diameter of the Flame Scale Star is 80,000 kilometers, which is the volume of a gas giant!

When Xin Lin saw this, he was immediately surprised, which means that the surface area of the Flame Scale Star is 40 times that of the Earth, and the volume is 250 times that of the Earth!

"That's an exaggeration, isn't it?" Xin Lin was puzzled. Even if the density of the Flame Scale Star is small, its mass will be incredibly large, and its heavy gravity makes it difficult for any living thing to survive on it.

After he finished reading it, it finally dawned on him.

The mass of the Flame Scale Star is not as large as expected, only about twenty-five times that of the Earth, and there are a large number of voids in the interior of the planet, that is, the underground space, and these underground worlds even penetrate deep into the mantle, which can be called a cosmic wonder.

In other words, the Flame Scale Star is fat.

In addition, the geological composition of the Flame Scale Star contains an extremely rare and exotic substance, the Sky Star Stone, which is a superconducting mineral that can interfere with the gravitational effect. The Sky Star Stone is also an important material for making various gravitational and space devices, and it is very valuable, but every inch of land on the Flame Scale Star contains a small amount of Sky Star Stone Mine!

It is these Sky Star Stones that have created the vast underground world of Flame Scale, while mitigating gravity and maintaining a complex underground structure without collapsing, which has evolved over hundreds of millions of years to produce a rich and terrifying biosphere.

There are 666 known layers in the underground world of Flame Scale, each layer has a large number of biomes, most of them are used to surviving in high temperatures, many of them are intelligent creatures, but more are extremely powerful flame beasts, strange shapes, bloodthirsty nature, and even terrifying beasts with strength comparable to Martial Saints!

The deeper you go underground, the higher the number of layers and the higher the temperature, which is like the legendary Abyss Hell, so the Flame Scale Star is also called the "Hell Flame Star".

The planet is officially called Flamescales because it is ruled by an intelligent race called the Flamescales.

At least, part of the surface of the planet and the several layers of the underground world above it are controlled by the Flame Scale Clan, they have a history of nearly 100,000 years, they have a high degree of civilization, and their individual cultivation talent is also very prominent, there are many strong people in the clan, and the whole clan is under the rule of the King of the Flame Scales, and every King of the Flame Scales is a star powerhouse!

Due to the influence of the geographical environment, the Yanscale Clan has formed a unique cultural tradition, focusing on its own cultivation and exploration of the underground world, so it has not developed a very developed technological civilization, and its territory is limited to this planet.

More than 10,000 years ago, the Flame Scale Clan was conquered by the Galactic Empire and became one of the vassal civilizations of the Empire.

However, the Flame Scale Clan only owns one planet, and there is a star powerhouse in the clan, the Galactic Empire casts a rat trap, and there is no big fight in the process of conquest, and finally signs a treaty, the Flame Scale Clan only needs to hand over a certain amount of fire source crystals and empty star stones on time, so that it retains a high degree of autonomy, so that the whole clan can continue safely.

Now the Flame Scale Star nominally belongs to the territory of the Galactic Empire, but in fact, the Empire's presence on this planet is very low, and because of the two specialties of Fire Source Crystal and Sky Star Stone, the Flame Scale Star has gradually become the trade center of many alien civilization races, and it is also an adventure paradise for countless interstellar explorers.

"It's hell and heaven!"

Xin Lin couldn't help but shake his head and sigh, the universe is so big, there is such a magical planet in the galaxy.

The Federation also has many explorers who have gone to the Flame Scales, so they have brought back such detailed information, and many people have made a fortune on the Scales, and of course more people have died there, and dangers and opportunities coexist.

Xin Lin didn't make up his mind and went to the Flame Scale Star.

He also checked several other planets that produced fire source crystals, all of which were far away, and even one was located on the other side of the galaxy, more than 70,000 light-years.

In fact, the distance doesn't matter to Xin Lone, anyway, there is an inverse entropy star, as long as it is within the Milky Way, you can directly teleport to it. But these planets are basically under the jurisdiction of the Galactic Empire, with important resources and heavy guards, and there are few opportunities to contact the ore veins.

Occasionally, there are one or two planets that do not belong to the Galactic Empire, but the relevant information is very imperfect, and none of the races that occupy the planet are easy to mess with, very xenophobic, and the social environment is not as loose and open as that of Flame Scale.

After reading the information, Xin Lin thought for a while, and still felt that the Flame Scale Star was the best choice, and the risk factor was the lowest.

"Augustus, do you think I should go to Flamescale?" He asked softly.

"If you're not in a hurry, you can go. It is also a very safe choice to stay in the Federation and cultivate patiently for more than twenty years, and slowly break through to the Martial Saint. Augustus said calmly, he looked at Xin Lian, and said, "Actually, you already have the answer in your heart, so you don't need to ask me again." ”

Xin Lin smiled, got up and walked out of the room, ready to inform his parents and friends of his decision.