The protagonist does not anticipate such a situation, and loses a ballista during the experiment, which makes the protagonist feel a little painful.

Fortunately, after inspection, it was found that it was not as serious as it seemed on the surface, and it was possible to repair and replace a crossbow arm part, but after all, it would take man-hours, and this ballista would not be able to participate in the battle in a short time. This made him have a black line in his head.

However, the protagonist does not give up, and he still sets about continuing to improve the firebow arrows.

Since the oil mixture can easily cause the ballista to ignite, and the fluidity is not easy to preserve, the protagonist experiments with another way.

Soak the bolts in the oil mixture, then immediately put them into the unsolidified ant gum that has just been collected, and then take them out to air dry.

When the ant glue forms a membrane on the surface of the crossbow arrow, the oil mixture is enclosed in the crossbow arrow shaft soaked with the oil mixture, and the air is isolated, so it is not easy to spontaneously combust.

This time the experiment was a success.

When the crossbow bolt is fired, the friction with the crossbow arm groove causes part of the ant glue film to tear, and when the crossbow arrow flies at high speed in the air, it quickly ignites the oil mixture exposed to the air from the gap, and the whole crossbow arrow becomes a long flame in the blink of an eye, and when it hits the target, the sparks are splashed everywhere, and it is still burning.

The most important thing is that there is only a small amount of ant glue film left in the crossbow arm groove, and there is no spontaneous combustion, and you can continue shooting after a little cleaning.

The protagonist is very satisfied, in this way, the ballista is not only a solid wooden crossbow arrow, stone projectiles two kinds of ammunition, the former only has pure physical penetration damage, the latter is slightly worse than the head and slightly less powerful, both have shortcomings.

The ballista now adds the Mystic Ball Crossbow Arrow, which has the characteristics of explosion and area damage, and the Fire Ballista Bolt adds fire damage, so that the combination of different ammo can better adapt to the battlefield environment.

Of course, two new ammunition can be urgently produced in batches to respond to emergencies, but there is still room for improvement, and the protagonist also asked Xiao Mi II to continue the research with the scientific research team.

With the results of the research of the mysterious liquid, in addition to the new weapons used for ballistas and defending the city, the protagonist also wants to improve the individual weapons.

For example, the sling, although it is slightly weaker in the face of other ants, can still kill, and has a restraining effect, which is an indispensable long-range strike method for the Divine Envoy King Legion.

However, in the face of the Destroyer, the slings thrown by the big-headed ant warriors are powerless to break through the defenses, and they can't even hurt the tentacles, and they may not be able to penetrate the compound eyes.

And even if the sling's silk ropes entangled the gigantic Destroyer, they would only be able to break free with a single struggle.

In the face of the Destroyer, the slings have been reduced to the point of being useless.

Therefore, some of the Divine Envoy King legions no longer use slings in vain when facing the Destroyer, but rely on the long-range fire provided by the ballista to suppress and support, and focus on melee combat.

However, the number of ballistae in the Divine King's army is now very limited, and they are mainly used in the defense of important places, and are rarely used in field battles.

The newly formed "tank units" can also provide some fire support, but the firepower is too poor, and there are too few "tanks" that have been rebuilt at present.

Therefore, the Legion of the Divine Envoy King still needs a single ranged weapon, and the protagonist decides to improve the sling.

The ammunition used in the previous slings was natural stone bullets or fired pottery bullets, which were covered with a net made of ant silk, leaving a long ant silk rope for throwing, and it was ready.

Whether it's a stone bullet or a pottery bullet, it's not powerful enough to face the Destroyer, and the protagonist wonders if he can turn the ammunition of the sling into a fire bomb as well.

With the experimental results of the scientific research team and the successful experience of the fire crossbow arrow, the protagonist quickly has an idea.

He quickly had the worker ants make an experimental firebomb with a liquid instead of a solid, a small drop of oil mixture enclosed by a thick ant membrane, attached to a throwing rope.

However, during the throwing experiment, an accident occurred, and the liquid fire bomb broke from the weak point of the rope connection before it could be thrown while spinning, and the oil-liquid mixture was thrown out, burning several ants next to it.

Although fortunately the oil mixture was very small and did not cause deaths or very serious injuries, the protagonist also saw two major shortcomings of the experimental fire bomb.

One is that liquid fire bombs do not have a fixed shape, are prone to breakage, and are not easy to store, carry and transport.

The second is that the oil mixture is too small, and it will be extinguished in a flash, and it will not burn for too long, so it will not have much lethality, and it will not even be thrown on the enemy and will be extinguished when it is still flying.

The protagonist struggles to figure out how to improve it, and soon he gets inspiration from the research team's experimental report.

The scientific research team has tried to use charcoal to adsorb mysterious liquids, and found that small charcoal can absorb a large amount of liquids, and the spontaneous combustion time is very long.

The protagonist asks the worker ants to find some small grains of charcoal, which are about the same size as the stone and pottery bullets used in the previous sling.

Although a large amount of charcoal in [Qingqiu City] was consumed during the failed first river opening operation, the fire produced new charcoal every day, and the worker ants quickly found the right enough charcoal grains.

The charcoal particles are soaked in the oil mixture and absorbed, and then immediately thrown into a clay pot filled with liquid ant gum, then taken out, covered with a net, and the fire bomb is ready.

During the experimental throwing, such a solid fire bomb did not cause an accident, and the ant glue film on the surface well protected the charcoal ammunition that was prone to spontaneous combustion inside.

But this is also the problem, this ammunition did not burn in flight, after hitting the target, probably due to the lack of impact force, plus the ant film is very tough and elastic, after a few bounces, it still did not break and spontaneously combusted...

The protagonist wants to reduce the thickness of the ant glue film, but without the help of tools, it is too difficult for the worker ants to accurately master the time of soaking ant glue, and the ant glue film of the appropriate thickness is too difficult, so he has to give up.

In the end, the protagonist came up with a simple solution to finally solve the problem of the fire bomb not burning.

The thrower two small openings in the fire bomb with his large jaw before shooting. Because the internal ammunition is solid, the big jaw of the thrower will not be contaminated with the oil mixture, and there is no danger, even if there is a small amount of liquid, it will be wiped clean by the ant film during the extraction process.

After piercing the ant film, the throwers immediately began to throw, and only a small part of the charcoal in contact with the air would spontaneously combust after a few seconds, enough time for the ants to throw the firebombs.

A fiery meteor streaked through the sky, "bang" and crashed into a rock, and the spark flew with the secretion of the smashed charcoal, which was spectacular.

The splashing spark did not go out, but continued to burn for a while, leaving a burning mark even on the hard rock.

Fire bomb sling, the experiment was successful!