"The stomach digests food and produces hydrogen, and hydrogen is a gas that burns. Richard looked around with a kind gaze, as if he were looking at a group of mentally retarded people, "The Earth Walker collects hydrogen in a stomach pouch and connects it to the bony tube in its mouth. As long as you contract this stomach pouch forcefully, a rapid stream of hydrogen can be ejected. ”

"Oh, that's right. Just when everyone's faces were full of confusion, it was Gunther who nodded first, "You may not know, but in fact, human farts can burn." But if that is to be said, aren't we just one spark away from breathing fire? If we can really breathe fire, it feels pretty handsome. ”

"Isn't that the dragon the equivalent of farting in the mouth?" Abu's train of thought was unexpectedly distorted.

There was a soft sound of horses' hooves, and Hurt walked up to the little man and covered his mouth silently, and he saw that many of them had a little wrong with their faces.

"Vozhi, you know and pee all day long, can you stop being so vulgar?" Richard rolled his eyes in anger.

He felt that Alpine Fort, which could have become the first good place of civilization, had been completely destroyed by these rough and reckless men.

"But how do you ignite the 'hydrogen' when it's spewed?" Vera struggled to imitate Richard's tone, uttering the word that was awkward to her.

"Guess what this is?" Richard stretched out his hand, a handful of dark red crumble in his palm.

Vera recognized it for a long time, but she could only shake her head, "I don't know." ”

"Phosphorite and flint scraps, I just found on the back molars of the Earth Dragon. The lord smiled and solved the mystery, "The Earth Walking Dragon usually has the habit of eating a small amount of gravel to help digestion, and it is completely qualified to keep a little in his mouth. And it has a rather dry mouth, with almost no excess saliva, so when it sprays a stream of hydrogen, it only needs to touch its upper and lower teeth like this......"

"It's going to make a spark!" Vera's eyes lit up.

"It's okay, not too stupid. Richard snapped his fingers approvingly, "The appearance of Mars will turn the extremely flammable hydrogen gas stream into a scorching flame dragon!"

"Sounds reasonable. Vera looked at Richard, her eyes were clearly full of curiosity, "Forgive me, I don't know if it's a delusion, I always think that you seem to have a lot of knowledge that is not compatible with today's mainstream naturalism?"

The lord didn't say anything, just smiled proudly, full of mystery.

"Without the help of the elements, with the simple use of the ingenious body structure, you can actually spit flames from your mouth? Hurt shook his head and sighed.

"Dear Hurt, it's far from it!" Richard shook his head, "Don't look at the size of the Earth Dragon, and it is impossible to store too much hydrogen in its body. The amount of gas stored will severely restrict their firepower, and they won't be able to spray a few times, right?"

The Raging Dragonrider looked at his lord with adoration in his eyes, "That's right, it can't continue to spray." ”

"Therefore, it is impossible to fire continuously like a real Warcraft. Richard looked like a philosopher, "You have lived in an elemental-rich environment since you were a child, and you may have long been surprised. But it seems to me that magic is so amazing and so convenient! It's easy to implement all kinds of functions that should be complicated, and it doesn't make any sense at all. ”

This sentence made everyone present wonder, what does it mean to "you have lived in an environment rich in elements since childhood", is there anyone else who is not?

However, the explanation Richard just made was so subtle that his image in the minds of everyone was infinitely higher, and no one was embarrassed to ask more, for fear of revealing his stupidity.

"It's also sharp!" Senid was still immersed in the shock of the flames from his mouth after all, and he pointed to the dead tree that was burning not far away, "You can set the wood on fire at once, and no matter how powerful the Tiger Spirit Warrior is, he can't resist it." ”

"Dear Senid. Berner smiled and said, "The breath of the Earth Walking Dragon has not yet reached the point where it can melt gold and scorch iron, and the enemies we have faced are all armored. They don't get burned as easily, so they're not as bad as you might think. ”

"Can't say that. Richard pondered for a moment and shook his head, "If the two cavalry are hedged against each other, and the Earth Dragon suddenly snorts fire, no matter how powerful the riding beast is, it will have to be frightened." ”

The scene he described made all those who knew a little about cavalry warfare break out in a cold sweat.

Once the momentum of the charge is disrupted, the cavalry will not only become a weak fish on the chopping board, but will also hinder each other's slow march.

The biggest weakness of the Ground Dragoons was that they were too clumsy, and if the opponent avoided the battle, they could basically only follow behind and eat ashes. But after learning this trick, once the opponent fell into a brief chaos, a group of Earth Dragons took advantage of the illness and rushed forward with a big foot...... I can't imagine it.

"Who said that only direct lethality is effective? No, no. Be flexible in your thinking and don't be rigid. ”

"Yes......" Bernard cupped his chin thoughtfully.

"But after all, you can't go back now, can you?" said Senid's unintentional words, and everyone choked at a moment's notice.

............

Although the battle was hard, there were basically no casualties at Takayama Fort. Because the armor is too good, there is nothing the sand spider can do with these cans in a short period of time.

The loss of the tiger spirit is not small, although Richard has not counted it, he also feels that at least a hundred can't be beaten. Combined with the different degrees of wounded, at least several times the number.

But Senid walked in a hurry, leaving only some of the tiger spirits to take care of the wounded soldiers and bury the corpses, while the rest rested for a while, and set out on the way back at noon the next day.

"I have to send the news of the sand spider attack back to the tribe so that I can communicate with the other tribes as soon as possible and see if there are any problems with the other gaps in the stone wall. "This is a major matter related to the survival of the entire Twilight Forest, so we must not waste any more time, and everyone has to work harder." ”

"It is fully understandable that all living beings who live in the forest should contribute to the forest. ”

............

After a few days of lackluster travel, the Tiger Spirit Tribe was already in sight. Before the arrival of the large army, there were already a few light Tiger Spirits who had taken a step ahead and went back to report the news.

When Richard sat on the back of the dragon and walked into the tribe, he suddenly found several bald scoops as large as huts, looming among the dense oak branches and leaves, reflecting the dazzling light of midday, almost competing with the sun.

"Traveler from afar, we've been waiting for you for a long time!"

Huang Lu's loud voice like a big bell shook the ground slightly. Thousands of yards away, it went straight into Richard's ears, so startled that he almost fell off the back of the earth-walking dragon.

"Giants?"