The underground cave is very large, and the entrances of the various caves are densely packed, and if you don't pay attention to it, you will definitely get lost in it, if it weren't for the platypus to lead the way, Haoren wouldn't dare to walk around easily.

The further he went, the dimmer the light in the cave became, and a ring of flames suddenly erupted from the platypus's neck, and Haoren staggered along the firelight.

After walking for about a quarter of an hour, Haoren followed the platypus to a very empty cave, and was startled again when countless clusters of flames rose into the air, dispelling the darkness.

In addition to the reptilian platypus that landed on all fours, there were also a few platypus with two legs, which were stronger than the average platypus and had more flames on their bodies, and they seemed to be the head of the population.

Haoren's arrival caused the platypus to scream one after another, as if they were discussing something with each other, and after a few minutes they all fell silent.

The two-legged platypus that took the lead stepped forward and barked at Haoren a few times, Haoren of course didn't understand it at all, and the platypus seemed a little disappointed, stretched out its claws, and pointed around the cave.

Haoren cautiously stepped forward and observed the rock wall above by the light of the fire, and found that countless murals were painted on it, and the side of the murals was also engraved with tadpole-like words.

The rock walls here are unusually smooth and smooth, and even after an unknown number of years of changes, the cave is still as clean as ever, which is obviously not naturally formed, but carved by a highly developed civilization race.

The mural depicts a very huge city, every building, every street, and even the appearance of every person in the city is so lifelike, some buildings can vaguely distinguish whether they are factories or residences, and some are completely unrecognizable.

This is obviously not a modern city, Haoren is completely attracted to it, and is deeply attracted by this vast prehistoric civilization mural, and can't help but be amazed.

The mural shows every corner of the city, making it seem as if you can feel the vitality of the city, but when you get halfway through the mural, the content begins to change.

In a corner of the city, a circular gate appeared out of thin air, and countless hideous and strange creatures swarmed out of the door, and these creatures were unusually numerous, and swept the entire city in the blink of an eye.

Even standing in front of the icy mural, Haoren seemed to feel the despair and fear of the people in the mural, the mysterious creatures tore everyone apart and swallowed it into their stomachs, the buildings were all razed to the ground, the whole city was burning, and the black smoke even obscured the sun.

The warriors in the city are desperately resisting the attack of mysterious creatures with swords, their combat power is very strong, one against ten, or even one against hundred, they can easily destroy monsters, but the number of monsters is too much, often tens of thousands of monsters at the same time to launch a siege on a warrior.

The warriors defending the city were outnumbered and dwindling, until at last only a gray-haired old man, full of grief and despair, stood on the tallest tower in the middle of the city, holding aloft a staff of strange shape, chanting something in his mouth.

On a volcano next to the city, a pillar of fire suddenly rose into the sky, and magma mixed with various gray-black poisonous substances poured towards the city.

In the end, along with all the monsters, the entire city was completely annihilated in a thick layer of volcanic ash.

The mural is completely over here, but Haoren's heart can't be calm for a long time, judging from the buildings in the mural, the degree of development of this civilization is definitely not inferior to the current human race, but in the end it has to die with the monster.

"These are probably dark creatures!" Haoren muttered to himself, his mouth full of bitterness. Next to the mural there were rows of very small fonts, and to his surprise, Haoren recognized them.

That's right, this is the civilization of the first generation on Earth, that is, the so-called fourth civilization era, and Haoren, who has just turned to a junior linguist, can barely understand this kind of writing.

"We were destroyed by the hands of darkness, but I will not be willing to let the most precious crystallization of our race for thousands of years be lost, so I will leave the scroll of fire here, the scroll of fire is the root of fire in the world, the sect of ten thousand fires, I hope that future generations can continue to pass it on."

At the end of the mural, there is a metal box, the metallic luster on it has been dimmed after hundreds of thousands of years, but the box itself is not damaged, Haoren couldn't help but reach out and take the box, open it carefully, there is only one scroll placed in the box, the scroll is not known to be made of what substance, thick and smooth, after 10,000 years can still be preserved.

The scroll was also written in the Fourth Civilization Era script, and when Haoren unfolded the scroll, countless contents suddenly flooded into his mind, as if he wanted to stuff all the words in the scroll into his mind.

Dizzy for a while, Haoren gradually came to his senses, checked the scroll again, and found that it was already empty, and with a little touch of his hand, the scroll turned into powder and disappeared into the air in an instant.

Successfully fused the Heart of Fire, the current level is 1, and you can learn more advanced spells in the Scroll of Fire by increasing the level.

Haoren was confused, not quite understanding what this so-called Fire Heart was, but when he glanced at his state, he was surprised to find that there was actually a Fire Sword Qi below the sword qi value.

Fire Sword Aura: Converts normal sword qi into fire sword aura in a ratio of 10 to 1, which has more powerful attack power and has a fire caste.

It took a long time for Haoren to gradually sort out his thoughts, the city in the mural belongs to a branch group in the Fourth Civilization Era, this group is famous for being good at the art of fire, and what is hidden in this fire scroll is the crystallization of the wisdom of the race for thousands of years, the heart of fire.

What is the heart of fire, Haoren can't figure it out, it seems to be an invisible thing, and when it is opened, it is integrated into his body, and it subtly changes his physique, for example, there is an extra sword qi of fire, for example, he found that his flame resistance surname actually has an extra 20 points.

And what is copied in the Flame Scroll is the various superb fire spells of this ancient race, a spell based on the premise of fusing the heart of fire, when Haoren's heart of fire is upgraded by a level, he can comprehend an additional spell from the scroll. And if you want to increase the level of the heart of fire, it is very difficult, and it is by no means easy to upgrade after using it a few times.

It is already the heart of fire at lv1, and as a bonus, Haoren has comprehended the first spell from the scroll, the wings of the god of fire!

The spell itself is not optional, it can only be comprehended randomly, although Haoren feels a little cheating, but after reading the introduction of the Vulcan Wings, he immediately smiled.

Vulcan Wings: Condensed with fire sword qi to form flame magic wings, every second it lasts consumes a little fire sword qi, when the fire sword qi is consumed, the fire god's wings disappear.

Despite not having any attack or defense capabilities, or even any caste bonuses, this skill made Haoren's heart beat so excitedly that he couldn't wait to use it on the spot.

His total sword qi value was now 200, and he converted all of them into 20 fire sword qi according to the ratio of 10 to 1, and then gently chanted: "Wings of the Fire God!" ”

The air suddenly became extremely hot, and the fiery red sword qi gushed out from his body, wrapped around Haoren's body, only to hear a soft sound of "Peng", and a pair of fiery red wings suddenly stretched out from Haoren's back, and layers of flames flowed from the feathers.

Haoren was inexplicably surprised, he didn't expect that he really grew a pair of wings, he controlled the fire wings to stir up, and his body suddenly rose into the air, flying and circling in the air, drawing a brilliant red arc.

"Haha! I can fly, I can fly! ”

In mid-air, Haoren was so excited that he danced with his hands, flying back and forth in the cave, forgetting the time for a while, and the 20 fire sword qi was only 20 seconds, and soon the fire sword qi was squandered.

Poof!

Vulcan's wings suddenly turned into sparks and dissipated into the air, and the smile on Haoren's face stopped abruptly, and he froze for half a second, and then fell to the ground screaming, with a damage value of 200 points above his head.

Getting up in pain, Haoren sat on the ground rather depressed and sprayed the primary hemostatic potion, and then glared angrily at the strangely smiling platypus around him, these platypus beasts have extremely high IQs, and they watched Haoren fall down with great pleasure.

"The time is too short, and you have to consume all the sword qi values to convert 20 ignition sword qi, and the conversion rate is also very low. In battle, you must always pay attention to the consumption of sword qi, otherwise you will not be killed by the enemy, but fall from the sky and fall to your death, this kind of death is too embarrassing. ”

Haoren began to analyze it seriously, in fact, although this Vulcan Wing looked very gorgeous, it also had more flaws. At least with Haoren's current sword energy value, Vulcan's Wings can only be used as a terrifying skill in an emergency.

But even so, as a skill that can fly, the wings of the god of fire are definitely a divine skill, and in the current period, apart from him, what other class can master the skill of flying?

"It's handsome to think about, the skills comprehended by the heart of fire at lv1 are already so powerful, and I'm really looking forward to the skills in the future."

Haoren looked at the platypus around him again, and through the records on the mural, he learned that these were the descendants of the platypus raised by the destroyed civilization race, and they had been living in the dark caverns, feeding on lava, and the last legacy left by their former masters, the Heart of Fire, for generations.

"Zixia Mountain is probably the last volcano to destroy the human race, and there is a lot of flame energy gathered here, so it will produce a mutated creature like the Fire Ant King."

Haoren sighed and said slowly: "On behalf of your master, I thank you for the protection of generations, I have accepted the heart of fire, and your task is complete." ”