Although it is said that it will be outside, just wave.

But Zhang Yang was still quite uneasy, he hid in the cave by himself, staring at him with big eyes, and he was scratching his heart with a hundred claws.

If it weren't for the law of true incense -

Well, the big husband said a word, and the eight horses couldn't pull it back.

After re-doing his psychological construction, Zhang Yang went straight to the deepest part of the cave, the so-called out of sight and out of mind, if he wanted to retreat, he really went to retreat.

"Uh, it stinks!"

A few seconds later, Zhang Yang rushed out of the cave like a fledgling, after all, he was not a real person who was breathless.

"Don't look at me, I'm going to find a place where I can really retreat!"

Zhang Yang walked away angrily, he did what he said, said not to interfere, and said not to interfere!

This valley is full of stone walls and cliffs, so it shouldn't be difficult to find a cave, and he has to think about how to improve the problem of optimizing the mana structure there.

Half an hour later, Zhang Yang walked back helplessly, because there is such a cave in this valley, and it is such a high-quality cave, with a depth of more than 50 meters, and the winding path is secluded, it is too smelly.

"Count you primitives ruthless, no, count you Neanderthals ruthless!"

The bad belly in his heart slandered Zhang Yang didn t look at Wu Yuan's inquiring gaze, don t be close to me, now Lao Tzu is air.

It took him most of the day to clean up the inside of the cave, and at this time he felt that he had become a piece of stinky meat, and this kind of thing was okay to command the clansmen of other quack tribes, but Zhang Yang did what he said, everything depended on Wu Yuan himself, he didn't help, he didn't interfere, and he wouldn't pull back.

During this period, Zhang Yang also personally hunted an ordinary fierce beast, and he wouldn't even share food.

When he had set up a small fire in the deepest part of the cave, the billowing smoke that had nowhere to place reminded him of something.

"I can burn trees into charcoal! Simple wood burning, the flame it produces is not a complete high-temperature plasma state, even the outer flame with the most adequate contact with oxygen, its temperature is only five or six hundred degrees, but if it is replaced with charcoal, it can easily refine the existence of steel, up to more than 1000 degrees!"

"Wait, let me think about it, what does chemistry class say? Charcoal doesn't seem to burn as a flame, but as a light, right, because the essence of a flame is a flammable gas, including high-temperature steam, all kinds of small solid particles, and when it comes into contact with air, it undergoes an oxidation reaction, and then light and heat appear, that is, it becomes a plasma state-"

"I used the compressed soul force field to form a second closed-circuit circle, and then formed a curved force field, and the flames it absorbed were not as terrible as ordinary people thought, so mysterious, it was just a gas that could not be fully burned. ”

"So what I have to figure out now is whether the light emitted by the charcoal burning, that is, the heat it emits, can be sucked into the second closed circuit circle instead of the flame? After all, heat can only be a process quantity, and it is different from the nature of the flame, the flame is tangible, and the heat is invisible. ”

Zhang Yang fell into deep thought, and only smiled for a long time,

"It's a bit of a bull to think like this, and I'm not engaged in theory, how to do it, just try it!"

Zhang Yang started the production of charcoal with great interest, fortunately, even if he is a scumbag, he also knows some charcoal production methods, and the burning wood is directly buried with ashes, isolating the air, and the rest is almost charcoal, of course, the quality is definitely not as good as that of professional burning.

This busyness is two whole days.

During this time, Zhang Yang always insisted on his promise not to interfere in all of Wu Yuan's decisions, and even Wu Yuan came to report to him and was driven away by him!

Of course, Wu Yuan will only look for him once, if he comes a few more times, maybe Zhang Yang will break his promise.

In the past two days, Zhang Yang burned about 500 kilograms of charcoal, not to mention the quality, in the process of burning charcoal, combined with what he learned in the past and can still remember at present, combined with the soul force field, he really found out a lot of interesting things, which made him full of confidence in the next experiment.

On the third day, that is, the fourth day of the Hero Trial, before Zhang Yang started the experiment, Wu Yuan took fifteen warriors of the Quack tribe to the expedition, and he didn't inform him before leaving, and even Zhang Yang didn't know what Wu Yuan was going to do?

At this moment, it is impossible to say that Zhang Yang is not worried and does not regret it, he is afraid that the next moment there will be news that the hero trial has failed and he has been wiped out, oh, no, there will be news after being erased?

Like ants on a hot pot, he turned around a few times, and finally Zhang Yang still yelled, and he didn't care about it, he chose to believe in Wu Yuan, believed that he could do everything independently, believed that he would grow up quickly, and believed that he was really the hero of the village.

"Where is this special heroic trial, this is clearly the bloody trial of the village chief!"

With a long sigh, Zhang Yang finally let go, got rid of distracting thoughts, collected his mind, and began to concentrate on building a simple earthen stove.

He also didn't want a sealed furnace that could make iron, but a little bit of charcoal to burn enough and then reduce heat loss.

After all, he was just experimenting, not steelmaking.

In other words, he must have been the first person ever to study fireball magic in such a down-to-earth manner.

When the stove was slightly dry and formed, Zhang Yang put the charcoal in the place, and finally ignited it, and the stove was covered with a stone slab, a blower—of course not, but he could use the soul force field to compress the balloon, clumps, and constantly feed into the burning earthen stove, which worked wonderfully.

So in just a moment, it's a heat wave.

Zhang Yang didn't dare to wait too long, his soul force field could control the flames purely because the temperature was not high enough, and now the temperature in this earthen furnace was almost six or seven hundred degrees.

As soon as he gritted his teeth, Zhang Yang began to compress the soul force field, and he didn't need any compressed air balls, but directly built a second closed-circuit circle, forming a curved force field, enveloping the earth furnace - bang!

With a loud bang, the earthen stove shattered, and the earth, stones, and reddish charcoal were sucked into the curved force field, and in an instant, a ball of earth appeared out of thin air in his hands.

Thanks to his quick enough reaction, he directly constructed the fourth closed circuit circle and threw the earth ball.

"Boom!"

There was a loud bang, smoke billowed and earth and rocks flew around, this picture is so familiar.

Standing for a long time,

Zhang Yang: MMP, is this a grenade?