Richard walked along the mountain road, frowning slightly, and had almost walked around the mountain, but he had not found any passages or cracks. Combined with the previous exploration of the consciousness body, it can basically be determined that it is basically impossible to take a shortcut to take the crystal skull out of the mountain.

Then you can only find a way to carve out a tunnel from the outside of the mountain, enter the secret room inside the mountain, and then take out the crystal skull.

In this case, it will be a project of no small scale, especially in the current medieval world.

If you use hammers and anchors by manpower, it will be difficult to complete it in half a year.

If you use spells, there is indeed an earth-based spell that destroys rocks in "Chapter of Monroe", and I have recently learned one, but at the wizard apprentice level, it can only be cast on a very small scale, and even if it is used constantly, the effect is very average.

I'd better think of a better way.

Richard's eyes narrowed slightly, and he stopped on the mountain road, looking thoughtfully at a rock wall next to the mountain road.

Richard knew that a few dozen meters behind this rock wall was the secret room, but how to cut this distance as quickly as possible?

After a moment of thought, Richard raised his hand to the rock wall and pronounced a incantation in his mouth.

"Whoa...... Whoa......"

On the rock wall, the rock cracked and peeled off little by little.

Plastic Earth Spell, Zero Ring Low Rank, Earth and Stone Mastery.

"Bang Bang Bang Bang", the rocks kept falling, splashing a lot of dust, which seemed to be very powerful, but in fact, it only took a long time to make a hole with a diameter of three or four centimeters and a depth of more than ten centimeters.

Richard looked at the hole, pursed his lips, and recited the incantation again, and a moment later a cloud of liquid oxygen emerged and filled the hole.

After doing this, Richard thought about it, and found some wood chips and hay from nearby and stuffed them into the holes, which were stuffed to the brim, and the standard liquid oxygen explosives were completed.

Yes, liquid oxygen explosives, explosives in the true sense of the word, are somewhat different from ordinary liquid oxygen mass explosions, because they are filled with some combustibles.

Liquid oxygen explosives, a type of mine explosives, were invented by the German Linde in 1895 on modern earth. Generally, combustibles (such as carbon black, coal ash, paper scraps, wood chips, etc.) are wrapped into cylinders, immersed in liquid oxygen before use, and immediately transferred to the place where explosion is required after being filled with liquid oxygen.

After the detonation, the combustibles inside burn rapidly, the temperature rises sharply, and the volume expands sharply, causing an explosion that is more powerful than nitro explosives such as TNT.

Liquid oxygen explosives have a very low cost in a complete industrial system, but because liquid oxygen volatilizes quickly at room temperature, the life of explosives is very short, generally 15~20 minutes, and must be temporarily soaked before use. Therefore, it cannot be used to make bullets, bombs, shells, etc., it is a kind of "peace" explosive, and the biggest use is industrial mining.

To put it simply, this is the explosives that are specially used to open up mountains.

Open the mountain explosives, explosives open the mountain.

Stepping back, turning his head, looking at Pandora, and pointing to the side.

Pandora's eyes flashed, she understood what she meant, and reluctantly stepped aside to dodge.

Richard took a deep breath, looked at it with certainty, and waved his hand to release a cloud of flames that shot at the liquid oxygen explosives in the hole.

Immediately after, a wall of air was released in front of him.

With a "boom", the flames flew into the hole, detonating the liquid oxygen explosives in the real sense, and the rock wall shook violently, bursting a huge hole along the slotted hole, and the gravel collapsed like a bullet, flying in all directions, and then "bang" was blocked by the air wall.

When the dust settled, Richard removed the air wall, took a look at the effect, and found that he was relatively satisfied. At least using liquid oxygen explosives to open the mountain is more efficient than using manual and simple spells, and the entire project can be completed in less than a month.

But in the process, some of the issues that may arise should also be fully considered.

After all, to dig a tunnel, you don't just have to use explosives to blow it up all the time.

Violence and destruction cannot solve any problems, and the real solution to the problem still depends on the use of the brain.

Digging a road may seem simple, but there are many aspects that need to be taken into account, otherwise the modern earth would not have developed into a complete industry.

The method of filling the tunnel with borehole filling explosives is called the drill and blast method on the modern earth, and it is mainly used in the construction of mountain tunnels. In addition to the core blasting, it is also necessary to consider a series of problems such as measurement and pay-off, bracket reinforcement, ventilation, smoke exhaust, and slag removal after blasting.

Although the excavation of the road is now prepared to be disposed of, and it is not intended to be used repeatedly, and there are no strict requirements in some safety aspects, it cannot be completely ignored. Otherwise, what if the road is dug halfway through and blasted in one blast, and the entire mountain is blown up? According to the volume of this mountain, if it really collapses and is buried inside, not to mention the wizard apprentices, even the real wizards, will not be able to survive.

Therefore, some problems must be thought out clearly, and solutions must be found, and then the real excavation can begin.

For example, the stent problem needs to be solved. It is feasible to reinforce it with wood, and there is no shortage of wood in the forest. But it's better to get some high-quality iron.

It's just that the mining, refining, and building of iron is more troublesome than digging tunnels, and if you do it yourself, it will take too long. However, fortunately, the technology content is relatively low, and the current world has a relatively mature system, and it is completely possible to directly contact the outside world and solve it by purchasing.

Money, I have it. There are a lot of gems in the suitcase. After all, in order to get rid of the shackles of identity and leave the Blue Lion Kingdom, he had planned it a long time ago, and all aspects were taken into account. But it's not enough to have money, you also need to have access to people who can trade.

So...... Where to find it?

Or, think of another solution?

Richard pondered, beckoned to Pandora, and headed down the mountain.

......

Push back a little bit.

In the forest below, the dead leaves are dense, and the sound of horses' hooves sounds.

"Da Da Da ......"

Prince Gro rode forward on horseback, and the rest of the nobles loomed around him. The soldiers on the outskirts were on guard while scouting, and their task was to find the beast first and notify the nobles, let the nobles hunt it, and prevent the beasts from going berserk and attacking directly and injuring the nobles.

At this moment, a strange roar suddenly sounded on the mountain next to him.

"Neigh!" some of the horses were frightened, their front legs raised high, and then they fell heavily, making two deep depressions in the ground.

"What's the situation?" someone shouted.

Everyone immediately became vigilant, drew their weapons one after another, and looked around vigilantly.

One second, two seconds, three seconds......

A minute and a half passed, but nothing happened.

This......