Xiao Chen sewed two large air bags out of animal skins, and used wooden sticks as skeletons to support them. (.) A large bamboo basket is fixed underneath, and a combustion device is installed in the basket, which is lit like a large candle to continuously provide hot air to the air bag above.

A barrel of fire oil was poured into it, which could be burned for at least half an hour, and more than a dozen wooden barrels were fixed with cotton ropes around the bamboo basket, and inside were a mixture of fire oil and sulfur, saltpeter and metal powder, which he figured as an incendiary bomb.

In addition to the violent combustion of this incendiary bomb, the shock wave generated by the explosion is also considerable.

That's right, the thing he made could be called a hot air balloon.

It's just that the burning device burned like a big candle for a quarter of an hour, and there was more and more hot air in the air bag, but the hot air balloon did not fly.

The main reason for this is that the load is too heavy, as long as you take down a wooden barrel, it can rise to the sky smoothly. It's just that this hot air balloon is not prepared for ascension, but falls.

The cotton rope tied to the barrel is very particular, and each barrel has a separate rope to fasten, and one end of the rope is attached to the burning device, and only a fire door needs to be opened to the flame will burn here.

Looking at his masterpiece, the little marquis smiled, patted the soil on his hands, and said to himself: "I don't believe that under this frequency of harassment, the hydra can still stay in the nest in peace!"

With a wave of your hand, extinguish the flame and put it away in the bracelet.

A few minutes later, he came to the cave of the hydra, climbed the hill next to it, and released the hot air balloon, while the fire-attribute leaf martial spirit shot a flying needle at the "candle" part.

Sou......

The flying needle ignited the "candle", and the airbag was originally filled with hot air, so the speed of the fall was not fast, and it fell down the straight cavern.

Sou......

The second flying needle struck the fire door mechanism, and the fire door opened, engulfing the area in an instant, and igniting the cotton rope at the same time.

The cotton rope burns slowly, and the first one quickly burns to the key part, and with a crisp sound of the metal mechanism, the corresponding wooden barrel on the bamboo basket falls in response, driving the ignition device on the barrel lid.

The ignition device adopts a certain delay function, and the gun-powder in the bamboo tube burns slowly, and bursts when the wooden barrel falls to a certain height, igniting the mixture in the barrel.

Rumble......

The barrel split apart, turned into a flame that burned in time, and fell towards the bottom of the cave.

Half a minute later, the second barrel fell, followed by the third, then the fourth......

The barrels fell from the sides of different bamboo baskets in a certain order, so the hot air balloon did not tip due to the change in weight, which was calculated by the little marquis.

Flashes of fire flashed out of the hole one after another, and he looked down to see that the hot air balloon was all right, and then turned away and went to set up a ballista position six hundred meters away.

This time, he deliberately increased the shooting distance by 100 meters, in order to get one more chance to shoot.

After installing the ballista, he opened the strings and arrows, his eyes were fixed on the exit of the snake's den, and his right index finger was lightly rested on the ballista, and he was ready to fire at any time.

Rumble......

The sound of incendiary bombs bursting came from underground, and it was a little dull.

The hydra was tired of being, in fact, it should be more appropriate to call it an eight-headed snake now, the neck without a head was gone, leaving only a circular scar with a diameter of nearly two meters on the upper part of the abdomen.

Eight heads and sixteen eyes, all at the same time glowing with anger.

It clearly knows that it is the guy who cut off one of its own heads, and it wants to go up and break it into pieces, but it also knows very well that once it goes up, it may suffer.

But anger eventually prevailed over reason, and it swung its powerful belly to the bottom of the hole.

The hot air balloon is still throwing barrels down, and the place has burned into a sea of fire.

Fearless of these high-temperature flames, the hydra raised its ice attribute head and shot dozens of ice picks upward.

With the sound of piercing the air, the ice picks all passed through the bamboo basket and hit the skin, leaving a pile of holes about five centimeters in diameter, and the hot air began to leak rapidly.

The balloon then drops faster, and when the skin is completely shriveled, it is in free fall.

Bang......

The remaining barrels exploded at the same time, and the flames completely engulfed the Hydra in an instant.

A second later, the white gas rose, the fire began to grow smaller, and the fourth head from the left spewed out something like white mist, which quickly dispersed, and the fire was immediately suppressed wherever it went, until it was completely extinguished, leaving behind the ground with brown residues of fire oil.

Its scale armor took on an eerie dark red, and its eight heads rose high together and began to climb upward.

With the lesson of the last time, it did not jump high when it came out of the hole, but climbed out very calmly, never thinking that the little marquis had already considered this possibility, and aimed at the direction of the hole instead of the sky above the hole.

So as soon as it appeared, it appeared in the improvised sights of the ballista.

Almost subconsciously, he gently hooked his index finger and pulled the crossbow machine, and the crossbow gun flew out in response, turning into a ray of light.

Before Hydra could gain a foothold, it was shot in the fourth neck by a crossbow gun, followed by a violent explosion.

The little marquis moved quickly to wind up the arrow, and the hydra did not stop after being beaten, it wanted to close the distance to launch a counterattack, and avenge the loss of the head.

Sou......

A second ballista flew past it and missed!

Coincidentally, Xiao Chen's third crossbow arrow shot without careful aiming was also missed because of his flustered movements!

And at this moment, Hydra is only three hundred meters away.

He took a deep breath and placed his new six-bolt crossbow on it, his eyes recovering his composure, aiming at the enemy who was rushing at high speed.

Sou......

The crossbow gun flew out, and after reaching the highest point, it quickly fell, and Hydra thought that if you want to dodge the attack, acceleration and deceleration are the most direct methods, in this case, of course, you can't slow down, then accelerate!

As everyone knows, the shooting range of the new ballista is limited, and when it accelerates like this, it is equivalent to actively colliding with it.

Under the eager gaze of the little marquis, the crossbow gun hit the base of the neck of the earth-attribute snake's head, and the hydra's body shook violently.

Immediately after, six gun heads exploded at the same time, and the sound was earth-shattering, and even the ground shook.

The shock wave caused by the explosion was like a hurricane, almost knocking him down more than 200 meters away, and the power was evident.

The firelight dissipated, and the neck of the earth attribute was blown off by Qi Gen, and only half of the fire attribute neck on the left was left, and both heads were gone.

Look at the ice attribute snake head on the right, the head is still there, the neck is full of holes, the neck bone is broken for a long time, and only a trace of skin and flesh is left connected to the head, drooping.

Obviously, this snake head can't be saved.

Xiao Chen thought that the explosion of six ballistas together would be amazing, but he didn't expect to be able to blow up the three heads of the hydra!

The Hydra was also stupid, and when it saw that the enemy was about to operate the ballista again, its first reaction was to turn and run away. The amplitude of the turn was a bit large, and the drooping head refused to bear the burden, and was thrown directly to a place dozens of meters away.

"Your sister, don't run, fight with the master for another three hundred rounds!" he shouted as he jumped to his feet.

As everyone knows, if the hydra really wants to kill the horse pistol, he can't resist it at all, and the new crossbow gun is only made of one, even if the other party only has five heads left, he can easily kill him.

In any case, two victories are a welcome achievement.

PS: Officially notified, the bump ticket will be officially invalid next month, please vote for the children's shoes in hand as soon as possible.