The platypus roared in unison again, and the sound in the huge cave reverberated back and forth, I don't know if it was Haoren's illusion, and he seemed to hear the platypus's relief in the cry.

Under Haoren's gaze, the platypus jumped into the magma one after another, swimming slowly towards the end of the magma, as for where they were going, it was no longer Haoren's concern.

This guardian of the previous civilization, after hundreds of thousands of years, finally left this underground cave, Haoren was full of emotion for a while, and I don't know if today's human civilization will become the destroyed race in the mural?

However, before thinking about this problem, Haoren first had to think about how to get out of this underground cave, and he looked up at the rock wall that was about ten meters high, and the rock wall was full of clusters of red rock crystals of different shades, and the surface of the spar was very smooth, and it was almost impossible to climb it with bare hands.

"Fortunately, I have the wings of the god of fire, but I am not afraid that I will not be able to get out."

However, Haoren didn't want to go out immediately, he planned to train here for a few days to familiarize himself with the skill of Vulcan Wings, and the previous test flight made him feel that flying also needed skills, such as hovering in mid-air, the frequency and speed of inciting speed, etc., which had to be mastered by his continuous practice.

Haoren also carried a lot of jerky in his space package, and in order to prevent accidents, he always stocked up on enough food and water, so that even if he was in a desperate situation, he would not starve to death immediately.

In the dark cave, Haoren couldn't tell the difference between morning and night, and usually trained day and night, spreading a pair of fiery red magic wings and flying around in the cave.

Several times he wanted to follow the platypus and fly towards the other side of the magma to take a look, but this idea was not realized because he was worried that he would run out of sword qi and fall into the magma halfway.

I don't know that after a few days, Haoren lived a life of eating when he was hungry and sleeping when he was tired, and continued to practice after waking up. He also has a good grasp of the essentials of basic flight maneuvers, and even some small tricks such as upside-down flight can be used to perform a few.

In addition to practicing the wings of the god of fire, Haoren did not forget to continue to explore this underground cave, and from time to time he would sit in front of the huge mural, just quietly looking at the mural, feeling the grandeur of the ancient civilization, and feeling the horror and helplessness of those prehistoric humans before the destruction.

"Humans are definitely not so easy to destroy!" Haoren sometimes burst out of the blue, perhaps to himself, or to the old man holding his staff high in the mural.

This old man with the crown on his head looked like he should be the supreme leader of this human race, possessing great strength, and even being able to cause a violent volcanic eruption with his own strength, what a shocking strength.

With no hope of saving his own people, he would rather let his people and monsters die together than let them become a meal in his belly. What a tragic choice!

The old man sank into the ground with the city, spent the last days of his life carving out this huge mural in this cavern, and left his last words, and then jumped into the magma.

As for the platypus that can swim in the magma, it was the old man who used the Heart of Fire to transform it, giving the ordinary platypus a very strong flame caste.

And those platypus that can stand on two legs are an evolutionary form based on the transformation of platypus, a creature known as the platypus, the platypus fire dragon has a strong attack power, can spray up to thousands of degrees of flames, is the killer of the ancient race, but unfortunately the number is too scarce after all, and it has not been able to save this race.

"It's an amazing civilization to be able to modify genes to create such powerful creatures." Haoren couldn't help but be a little envious, this kind of duck-billed fire dragon still exists to this day, I'm afraid there is only this one place in the world.

"You should catch one." Haoren was a little regretful, but this was just lip service, his current strength was compared with the duck-billed fire dragon, that is, the gap between elephants and ants.

In addition to this ancient mural, Haoren also found an even more precious thing in the cave, lava crystal!

That's right, it's the whole cave that can be seen everywhere, the whole body is red rock, Haoren later noticed that this rock is actually lava crystal.

Lava Crystal: An ore that is produced near high temperatures, and can be used for blacksmithing, tailoring, construction, etc.

Haoren's sub-profession is blacksmithing, and he is also more sensitive to things like ores, and in the forging list, many weapons and equipment require a variety of ores.

Lava spar, on the other hand, is a relatively rare type of igneous crystal, because it can only be produced near high temperatures, especially next to magma volcanoes, and the probability of lava spar is also the highest.

For the forger, the lava hedron can forge a set of equipment that is extremely resistant to high temperatures, and it is equipped with weapons that are equipped with fire damage, which will be unimaginably useful against monsters of the fire caste.

The simplest example, when attacking the Fire Ant King, if everyone in the team has a set of heat-resistant equipment, the team's defense will immediately increase by a notch, and there will be no need for so many priests to heal, and more output will be added, so that not only will the battle be easier, but almost no one will die.

Who knows if there will be stronger fire mutants in the future, it is better to prepare in advance than to cramm.

Overjoyed, Haoren decided to start mining on the spot, but because the Sword of Glory was badly damaged, he took out the Sword of the Battler and slashed down desperately towards the clusters of ore.

This efficiency is undoubtedly extremely low, and after a long time, the sword of the fighter is gradually broken, which makes Haoren speechless, scratching his ears and cheeks for a long time, he took out the simple blacksmith tools, opened the forging list, and found the miner's hoe column.

The miner's hoe is the most basic forging technique, as long as he inherits the forger, Haoren has never had the opportunity to mine before, and the surname Suo used this time to forge a decent miner's hoe.

As for the materials for forging, it was simpler, Haoren took local materials, randomly selected a few pieces of primary lava crystals, put them on iron felt, started a fire, raised the hammer, and with a clanging sound, a miner's hoe with a red luster was born.

Temperature-resistant miner's hoe: A relatively high-temperature miner's hoe with a temperature resistance limit of 2000 degrees Celsius, which can be used to mine ore.

Haoren's face was slightly strange, and he couldn't imagine that the miner's hoe forged from lava spar still had the characteristics of temperature resistance, but this hoe was really useless, after all, there were few mining places where the temperature exceeded 2000 degrees Celsius.

"Either way, it's better to mine with this thing than with a sword."

Anyway, there was still a lot of food left in the space package, so Haoren was not in a hurry to leave, and continued to work as a miner, desperately mining the mine.

Because it was his first time mining, Haoren's experience was obviously still very insufficient, and he soon found that the ore mined was also divided into good and bad grades. According to the purity of the composition, from low to high can be divided into primary, intermediate, high, delicate, flawless and perfect grade, the higher the grade of ore, the less impurities it contains, especially the perfect grade ore, that is, there is no trace of impurities.

For the same piece of equipment, there is a difference between the effect of using low-grade ore and high-grade ore, of course, ordinary equipment does not need to use too high-grade ore, think about it, and know that the purer the ore in the market, the price must be more expensive, and it may even be priceless.

There are two ways to obtain high-grade ore, either mining, but this probability is very small, and most of the mining areas must be dominated by primary and intermediate component ores; Either that, through the refining of low-grade ores by the blacksmith, you can get higher-grade ores.

For example, in this lava crystal, 10 primary crystals can be refined into 1 intermediate component, and 10 intermediate ores can be refined into 1 high-grade crystal.

And so on, refining a delicate-grade lava spar requires a thousand primary spars, refining a flawless grade spar requires 10,000 primary spars, and refining a perfect-grade spar requires 100,000 primary spars, which is a very terrifying number.

It wasn't until he began to try his first refining attempt that Haoren gradually understood such a basic principle, and while secretly smacking his tongue, he also decisively gave up his plan to refine a few perfect-grade lava crystals.

Just kidding, even if there were really 100,000 primary hedron in this underground cave, Haoren wasn't going to stay here for a few months to mine and refine, just because of the food problem, he would have to starve to death here.

However, Haoren soon found a quicker way, there are too many lava crystals in this cave, and the closer to the magma flow zone, the higher the quality of the lava crystals, on the rock wall closest to the magma, because of the high temperature erosion for many years, the lava crystals are mostly dark red, which is a symbol of high-grade crystals.

And among the clusters of high-grade spars, Haoren even found a few clusters of delicate-grade spars, although the number was extremely rare, it was enough for Haoren to be happy for a long time.

If you use high-grade lava crystals to smelt them, it won't take long to smelt perfect-grade lava crystals. But Haoren's appetite was even greater now, and he was no longer satisfied with these high-grade spars, and turned his gaze to the area of the magma flow.

Lava spar is produced in hot regions, and the higher the temperature, the greater the chance of forming a high-composition ore, such as the inside of magma, which is entirely possible to produce a higher composition of lava crystal.