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This passage is really deep, Long Tian himself silently calculated in his heart, he has gone deep into the ground for about a few hundred zhang, and he has not even reached the end of the passage.

Could it be that this passage can lead directly to the center of the earth?

Thinking of this, Long Tian himself shook his head and sneered, he is from the earth, and he understands the structure of the planet better than anyone in this world, not to mention this distance, even if it is multiplied by ten times, it is still far from the center of the earth.

What's more, if the Nebula Continent is a planet of the same shape as the Earth, it is definitely much larger than the Earth, and the distance between the surface and the center of the Earth is definitely much larger.

Long Tian, who was full of cranky thoughts, suddenly found a turn in front of him, he didn't think much about it, and turned around casually.

However, as soon as he turned this corner, his eyes suddenly opened up, and at the same time, the scorching fire element that was countless times richer than the passage rushed to his face.

What appeared in front of Long Tian's eyes was an underground cavern, about the size of three or four football fields.

In the cave, there is all churning magma, forming a magma lake, and on the surface of the magma lake, it is no longer as simple as a hot wave, but a thick layer of substantial flames.

The magma was churning, the flames were jumping, and the temperature of this underground cave had reached a rather terrifying level, if it weren't for the high level of Long Tian's Nine Turns Qiankun Gong, it would have been unbearable.

Otherwise, don't say that Long Tian is a middle-level martial king, even if he is a martial emperor who cultivates fire-based exercises, he will definitely not be able to last for a moment in this underground cave.

Only here, Long Tiancai truly intuitively felt what a great skill he had cultivated.

In the center of the magma lake is a small flame altar, on which a purple flame burns and jumps, surrounded by endless magma flames, like a graceful and noble emperor.

The moment he saw the purple flames, the three-legged Dan Furnace, which had been quietly waiting in the dantian after being refined by Long Tian, suddenly trembled violently, releasing an incomparably longing emotion.

"You want that purple flame?" Long Tian asked suspiciously, feeling the excitement of the Three-Legged Dan Furnace.

The Dan furnace let out a humming sound, and although he couldn't speak, he clearly expressed his will.

That's right, it just wants that purple flame!

"Although my cultivation is good enough, but it is only the cultivation of the Martial King, isn't it difficult for a strong man to let me collect that purple flame?"

Long Tian smiled bitterly, although this magma lake was terrifying, but with the magic of the Nine Turns Qiankun Gong and the strength of the Martial King, it was still possible for him to cross the past.

But that purple flame, even if it was so far away, Long Tian could feel its terrifying heat, which was not at all something he could touch at this stage, let alone subdue it.

"Buzz ......"

The three-legged Dan furnace seemed to be able to understand Long Tian's words, and after a buzz, it quickly spun wildly in the dantian, and after a while, when it stopped, Long Tian was shocked to find that there was another mental method in his mind.

No, it's not a mental method, it's a method of how to refine that purple flame!

It's weird!

Long Tian exclaimed, these days, are all treasures popular with their own exercises? An alchemy furnace actually knows how to teach people the method of refining flames?!

Spiritual weapons, even high-level spiritual weapons, can really be so magical?

Long Tian felt that he was probably still underestimating this three-legged Dan furnace, and at the same time, he secretly decided in his heart that if it was not necessary, this Dan furnace would definitely not be shown in front of others.

Otherwise, once it is seen by people who know the goods, it is very likely to bring disaster to themselves.

But the most important thing in front of me is to collect the purple flame that made the Dan Furnace excited.

Long Tian agitated Zhenyuan, and his body flew in the sky, and he was about to cross the magma lake and fly to the altar in the center of the lake.

Flying above the magma lake, Long Tiancai found that in addition to the scorching heat, the magma lake also emitted a huge suction, constantly pulling Long Tian's body, as if to drag him down.

Long Tian took out a stainless steel flying knife and shot it out with shaking hands, wanting to try the power of this magma lake, only to see that the flying knife flew out less than ten meters, and was dragged down by the suction.

But before it could completely fall into the lake, the substantial layer of flames on the surface of the magma had completely melted the steel smelting knives, and it was directly vaporized, leaving not even a drop of molten iron.

Long Tian was secretly speechless, the stainless steel flying knife was still like this, if a person fell into it, how could he be lucky?

Fortunately, Long Tian's divine sense was strong enough, and under the influence of his divine sense, Long Tian finally crossed the magma lake without danger, and landed safely on the altar in the middle of the lake, directly facing the purple flame.

Oh, by the way, according to the method given by the three-legged Dan furnace, it should be called "Star Pattern Purple Fire".

The star-patterned purple fire is a kind of supernatural fire of heaven and earth, named after the star-like patterns that flicker in its purple flames.

The supernatural fire of heaven and earth is referred to as spiritual fire, which is the spirit of heaven and earth, and it has been conceived and evolved by itself after a long time in a specific environment.

And the power of the spiritual fire is by no means comparable to the fire crystals used by ordinary alchemists, or the true yuan fire spawned by cultivating fire attribute exercises.

Therefore, refining a spiritual fire is the dream of all alchemists, refiners, and martial artists who practice fire-based exercises, and array mages are no exception, because in the end, formation mages still have to refine their own array flags and array plates, so that they can be more handy.

However, the scarcity of heaven and earth spiritual fire is also famous, and as for the ability to refine it, there are even fewer of them, not to mention the Northern Regions, even if there are few people in Zhongzhou who can do it.

Therefore, this time, Long Tian simply hit a big luck, and this great opportunity was almost not under the Enlightenment Golden Lotus and the Beast God Ridge obtained in the secret space.

The most important thing is that as long as the spiritual fire is refined, no matter how powerful the person is, it cannot be extracted from the body of the person refining it, so even if it is exposed, there is no need to worry about someone killing people and grabbing treasures, it will only cause the major sects to compete for each other, because a person who obtains the spiritual fire, whether it is alchemy, refining weapons or martial artists, will be the best among his peers.

Of course, if someone feels jealousy or a sense of crisis because of this, and thus strangles the person who has received the spiritual fire from the path of growth, then there are also people.

Long Tian didn't think so much at the moment, his attention was all focused on the star-striped purple fire in front of him.

The noble and elegant purple flame beats gracefully, like a smart elf, and on the surface of the purple flame, from time to time there are silver-white lines like a starry sky, adding a bit of deep charm in the elegance.