There are raw materials, and Gu Yuan also mastered the ratio of sulfur, nitrate, and charcoal, the raw materials for preparing gunpowder, so it is very easy to prepare gunpowder.

This technique could not be easily taught to others, so Gu Yuan only led the two Konoe Ladies to carry out it secretly.

The walls on three sides of the Protoss Palace were quickly completed, and at night, Gu Yuan actually dared to walk out of the cave and sit on the high boulder on the top of the cave. It was night, the moon was like water, and the stars were shining. A faint night breeze swept through the towering wall, blowing towards the ancient distance, and the air was instantly filled with the scent of wet earth and dead grass.

On the starlit Protoss pasture, dozens of buffaloes and dozens of sheep rested quietly under the protection of the outer barbarian dragon herds. The surviving belongings of this catastrophe, Gu Yuan has always been haunted by the catastrophic destruction brought to them by the stegosaurus group and the steppe wolf tribe, and the revenge will soon be carried out.

Looking farther away, clusters of phosphorus fire swayed on the dry bones scattered in the wilderness, drifting in the air with the wind, long away. In the barren mountains and fields wandered hungry beasts, large and small, all of them nocturnal carnivorous beasts, roaring from time to time, and the sound shook the mountains and forests for a long time.

But they could only cheer them on, and the dragon guards not far from them were not disturbed in the slightest. At this time, Gu Yuan's mind suddenly appeared with the real priorities, two major things: to make the soldiers' heart shields as soon as possible, to prepare rattan helmets, and to prepare gunpowder. It seems that building a wall is no longer a priority, after all, it is only one of the tools of guarding.

Gu Yuan thought of the fascination, and compared the shape and size of the rattan helmet with both hands, just like a modern helmet, of course, he was designed compared to his steel helmet, but like this modern military steel helmet, he Gu Yuan couldn't make it, and even a metal helmet couldn't be made.

The personal guards who guarded Gu Yuan, the two wives Shan Heshui, looked at Gu Yuan's stupid appearance, and gestured and laughed alone, the two of them were infected and became demented, and they also looked stupid!

"Chief, go back, it's time to sleep!" the mountains and water came to persuade Gu Yuandao.

"Hmm!

The next day was sunny!

Gu Yuan got on the horse and prepared to go to the wall building field to take the lead in doing some work for a while, so that he could command on the spot and solve some practical problems. In fact, he knew some methods of burning bricks, burning lime, and so on, but now it was not enough! He had just filled his stomach, put on leather clothes, and still ate meat, especially the living conditions were still very primitive, and he was just making do! He thought that when agriculture developed and there was food to eat and cloth to wear, he would build a large number of buildings, build houses, build a brick and stone city wall, and build a city here!

Suddenly, he was stopped by a group of soldiers on patrol, and they wanted Gu Yuan to make a major special report. It turned out that the patrol had recently discovered that there were fewer fish in Yangming Lake, almost gone. The barbarian dragons did not go down to the lake to fish and eat, but there were still strings of water bubbles coming out of the lake, and there was a lot of splashing.

Today, when the sky was just dawning, two old brute dragons may really want to taste the delicacy of fish, and they went down to the lake to fish, but the brute dragon did not eat the fish, but the fish ate them both! No one heard the wailing of the two old brute dragons, and after a short time they went into the water, they lowered their heads to look for fish in the water and never raised their heads again.

Then, little by little, the huge body disappeared, and when the warriors realized that something was wrong and ran to the lake to salvage the brute dragon with a hook and sickle, there was only one large skeleton hooked, white and forested, and occasionally dotted with a trace of red meat, which was too weird and too scary. So the group came to report directly to the chief!

"Didn't anyone notice the weirdness in the lake before?" asked Gu Yuan in surprise.

"There have been two incidents where the brute dragon ran out of the water very quickly! It seems that none of those brute dragons have eaten fish! We just think that there are few fish, and the brute dragons have come out when they can't find them, and there has never been such a situation today!"

So, Gu Yuan had to find a way to check it out in the lake. He sent for the leader of the nets and asked him to take people to the lake to fish. The leader of the nets really did his best in the water! He personally went down to the lake to set up nets, but he really didn't catch anything, not even a small fish!

"God Chief, there are usually two reasons for this in the pond, one is overfishing, even the female fish with fish eggs and small fry that have not grown up, and the other is that there are huge or many fish-eating demon beasts inside!" the net leader reported to Gu Yuanyu in a little panic.

"Oh? So, we haven't overfished Yangming Lake, so there must be a demon beast in it, and it should be called a carnivorous demon fish! Now that we can't catch a single demon fish with a large or small net, can these demon fish live in the water or live on land out of the water? It's an amphibious guy like a turtle!"

"This ...... God Chief! You're right! That's how it should be! When they get into the water, they eat, and when they're full, they leave the water and go to a hidden place on the land. However, they don't have time to get out of the lake today!"

"Could it be like this, the demon fish is in the water during the day and on land at night, basically the same as the turtle!"

"And the chief! Ordinary amphibians have the ability to drill into the mud without moving! Can this demon fish find out that we have burrowed into the mud when we catch him?"

"Yes, it's possible!"

"What should we do, God Leader!" the Net Leader hurriedly asked Gu Yuan for instructions.

"Stop! Three days later, let's go to the woods by the lake and the wetlands at night to look for it!"

"Yes! but ...... Why do you want it three days later?"

Looking at the suspicious look on the net's face, Gu Yuan smiled and told him, paralyze the demon fish! Since the demon fish is a demon, it is likely that the ghost is shrewd, and in the next two or three days today and tomorrow, maybe they will be stuck in the bottom of the water and not move! If he doesn't move, it will be extremely difficult for people to find him, let alone catch him!

"Coo-quack-" A sharp bird's cry streaked across the sky, and the Bird King immediately greeted him, and a pair of giant birds flew from the hundred-mile outpost in the northwest.

"What's wrong, another group of dinosaurs passing by?" asked Gu Yuan suspiciously.

The bird followed the king and shook his head.

"That'...... There's an invasion of outsiders?" the bird nodded, then shook its head.

"Well, what do you mean? There are people from the outside who have come, but have not yet entered our territory?"

The bird nodded solemnly.

"Oh-that's right!" Gu Yuan thought for a moment and said, "Go back and tell all the sentry birds and sentry guards that if anyone does not enter our territory, you don't want to be on the road, and once you enter, you don't fight them, but follow and monitor them on their side or behind them, and send the latest situation report at any time!"

"There is an invasion of the tribe, Chief, let me lead the company to meet the enemy, right?" the young man pleaded.

"Don't worry!

This matter was put aside for the time being, and Gu Yuan continued to inspect the work of building the wall! Looking at the endless pasture, Gu Yuan rode on the horse and suddenly had a new idea of using this large grassland!