The mysterious ball that had run out of energy under the sun showed no signs of being recharged at all, and was still cold and lifeless. Although it is not visible from the appearance of the mysterious ball with energy, the cold touch of the past indicates that the protagonist's charging plan is not feasible.

Isn't the mystery ball charged directly with solar energy?

So, what can living beings do to charge a "battery"?

Solar energy is the first thing that the protagonist naturally thinks of, after all, almost all plants rely on solar energy to survive, and the vast majority of animals directly or indirectly rely on eating plants for energy.

In other words, with the exception of the few poor species of organisms that rely on geothermal energy or chemical energy for energy, almost all the energy for the survival and activity of life on earth is inseparable from the sun.

Once the sun goes out, 99.99% of living things will die because they have lost their ultimate source of energy.

Then, as a part of the coexistence of living beings, the mysterious ball should also be directly or indirectly used with energy from the sun.

If the Mystic Ball does not directly convert the sun's energy into its own energy, then it is likely to obtain it indirectly.

For example, the Destroyer eats food, then digests it in the stomach to obtain energy, and then the excess energy is not stored in the form of fat, but in the form of "electricity" in the Mystic Ball, and this method is used to recharge the Mystic Ball, which is also theoretically past.

However, such an energy conversion efficiency is inevitably too low.

You should know that an animal stores energy by eating, and its conversion efficiency is generally only 10%-20%, if the sheep eats grass and the wolf eats the sheep, then the wolf converts only 1%-4% of the energy from the grass.

While the efficiency of direct conversion of solar energy by plants, C4 plants can be as high as 24%.

While 24 percent may not seem much higher than 20 percent, plants can convert energy all the time as long as they have sunlight and water, and animals rarely have species that can eat efficiently and continuously for half a day.

Therefore, if the Destroyer charges the Mystic Ball by relying on traditional animal energy storage methods such as eating, it will not only be inefficient, but also consume a lot of time. It's not that there is no such possibility, but the economy is too poor, so the protagonist intuitively feels that this will not be the case.

So, could it be that the Destroyer was able to convert other organs into solar energy and store it in the Mystic Sphere? After all, the protagonist suspects that the Destroyer is a biochemical creature, and there is a "battery" in the body, so it is normal to have a solar "charger".

Could it be that the little mystery ball on the Destroyer's head that will naturally damage is the charger? The protagonist has such a conjecture, but there is no way to confirm it.

Although it is impossible to verify the charging method of the Mystery Ball, knowing its characteristics, the protagonist immediately thinks of a lot of ways to use the Mystery Ball.

For example, when I thought of being a bomb and warming a baby before.

Especially as a heating device such as a warm baby, it can largely make up for the shortcomings of the Divine Envoy King Legion who cannot go out in winter.

For example, if the paver ants carry the mystery ball, as long as it is not a bad weather with wind and snow, they can be outdoors for about two days, which means that they can travel a distance of about one day.

Then not only can [Waterfront City] and [Bridgehead] be communicated, but also nearby nests such as [Hunting Ground City] can also be communicated, and the protagonist can even organize paver ants to carry out short-distance transportation in these places, completely overcoming the unfavorable situation that nests in various places can only rely on inventory to survive the winter in the past.

If you don't send supplies, but just communicate the message, the Flying Knight can carry multiple mystery orbs to warm himself and his mount, and then deliver the message over the course of a day's or so.

The speed of the Flying Knight's flight is sixty times that of the ants on the ground, which means that they can travel back and forth from [Waterfront City] to any nest in the territory of the Divine Envoy King's Legion in one day, and winter will no longer be the season when the nests are completely lost.

Imagine that if all the warriors of the Divine Legion were equipped with a Mystic Orb, they would be able to travel outdoors for a day in winter.

If the Flying Knight is allowed to transport enough Mystic Orbs to the stops along the way in advance, then, theoretically, the Divine Envoy King's Legion will be able to march and fight in the winter, and the Destroyer's winter advantage will not be so great.

Of course, now the protagonist can only think about it, if you want a legion of 2500 ants to act outdoors for 2 days, theoretically you need 2500 mystery balls, plus the consumption of the flying knight when transporting and other uncontrollable factors, then at least 3000 mystery balls are insured.

And the mysterious balls that the protagonist has captured now only add up to a few hundred, most of which are still stored in the [bridgehead].

The Destroyer is no longer attacking, and the protagonist has no way to capture more Mystery Orbs. For a moment, the protagonist actually hoped that the enemy would attack. But reason quickly suppressed this too romantic thought.

Not to mention the danger of the war, once the war starts, although the protagonist has confidence in the defense of the [bridgehead], it is bound to pay a lot of price, and it is unknown whether the captured mysterious balls can offset the war consumption and achieve profit.

Moreover, once the enemy besieges the city, it is impossible for the paving ants to transport the mystery orb.

The purpose of using the Mystery Ball is to gain an advantage in the war, and the Mystery Ball serves the war, not the purpose of the war is to capture the Mystery Ball, and you can't put the cart before the horse!

The protagonist simply asked the paver ants to take advantage of the good weather and hurry up to transport all the mystery balls to [Waterfront City] for storage in case of emergency.

In addition to the above two uses, the protagonist also envisions a lot of new uses.

For example, by taking advantage of the constant temperature of the mystery ball, ants can also make mealworm farms "open" in winter, unlike in the past, when all mealworms had to be slaughtered and made into jerky in autumn, and fresh meat could not be eaten in winter.

It is also possible to use constant temperature to process high-quality fermented beverages, but the current fermentation quality is unstable, and there are often inferior products.

You can also use the Orb as an explosive to dig up more ore. At present, there is not much copper ore that can be easily mined on the ground in [Malachite City], and the rest is either huge and impossible for ants to mine, or buried deep in the ground.

Once you have explosives, digging for more minerals or even changing the terrain of your territory on a large scale is not a problem. After all, the equivalent is not enough, the quantity is made up, and there is nothing that cannot be solved by the big bombing. If it doesn't work, then increase the equivalent and blow it up again.

A small mystery ball can have such a wide range of effects, it is simply a shortcut for the Divine Envoy King Legion to raise the level of science and technology by an era!