The wizards' airships did not take off, obviously because they were afraid of the power of the Griffin Knights. That is to say, they could completely imitate them and use the Griffin Knights' speed and height advantage to launch attacks from the air!

"Devi, you will lead the team this time!" Edwill continued to ask.

"I understand, Lord Edwyre, I will never come back until I complete the mission!" Devi placed his right hand on his chest and swore firmly. Then he led a group of griffin knights, carrying kerosene wrapped in special cloth, and rose into the sky.

"I will also go to meet these devil's followers and test their abilities!" Arno couldn't help but ask Edwyre for a fight, and also took a portion of kerosene and replaced one of the griffin knights to carry out the mission.

Hundreds of griffin knights rose into the air, their golden hair sparkling brightly in the sunlight, like golden clouds.

"Be careful, those griffins are taking off!" On the city wall, Lin En raised his voice a little and reminded.

In fact, there was no need to remind them. Such a big movement could not be concealed at all. Raphael and others who were wondering why the liquid was always round in the air were forced to interrupt their thinking and get ready together.

These elite troops began to move, which meant that the Church was serious! In just one minute, the griffin knights had already rushed to the sky above the capital, maintaining an altitude of about a thousand meters, circling continuously, and occasionally diving for a distance, passing about three or four hundred meters above their heads, which was full of provocation and successfully interfered with the performance of the musketeers.

Because no one knows when these griffin knights hanging in the sky will launch an attack.

"Pyroblast!" Several wizards who could not stand the provocation cast spells together after the griffin riders swooped down again.

Several fireballs rose into the air and flew towards several griffin knights high in the sky. Using Olympiad formulas, the enemy's flying position was calculated in advance, so it was a sure thing.

However, their plan failed. The griffin simply flapped its wings and suddenly turned in mid-air, easily avoiding the fire and explosion. Then, instead of taking off to avoid, it lowered its altitude again and flew over their heads, making the wizards very angry, and they all cast spells to fight back.

[Magic-Barrage], [Ice Storm], [Multi-Pyroblast]...

At once, dozens of magic spells flew high into the sky, trying to rely on their numerical advantage to forcibly knock down these agile griffins.

Unfortunately, Devi had anticipated this and commanded everyone to fly high into the sky again the moment he felt the strong fluctuation of magic power. All the magic was in vain again...

Raphael hurriedly spoke to stop them. "Stop it, don't waste your magic power and fall into the enemy's trap!"

"Damn it! If we could use that magic, how could these griffin knights dare to be so arrogant!" Nancy muttered to herself angrily. She and Glenn both learned the laser magic improved by Lynn and Anthony, but Lynn didn't let them use it easily, saying that the time was not right yet...

"Be patient. They don't have the courage to come over. If they get too close, we will just shoot them down. Just pretend they don't exist!" Raphael shook his head.

The wizards on the city wall were very unhappy but there was nothing they could do. Their magic simply could not cross such a long distance to cause enough damage to the griffin moving at high speed.

The opponent was too agile, and it was impossible to hit him! Devi led the griffin knights to frequently provoke the wizards on the city wall in the air. After roughly assessing the safe range, most of the griffins dispersed.

Arno did not leave, but fought together with a small number of griffin knights who stayed behind. He aimed at the cannons placed on the city wall, commanded the griffin under him to dive at an altitude of about 500 meters, and then suddenly threw the burning kerosene cloth in his hand to his target.

"Fire, it's fire!" a wizard shouted loudly.

"Is it some kind of magic?" Dennis frowned as he looked at the fireballs falling from the sky.

"I don't know, but it must be related to those griffin knights..." Sanchez shook his head, his expression was particularly solemn, because the same scene appeared in every corner of the sky above the capital, as if fire was raining down from the sky...

"Magic barrier!"

On the city wall, hundreds of official wizards cast spells together, and a circular magic barrier immediately enveloped their heads. The cloth wrapped in oil quickly disintegrated under the erosion of the flames, hitting the barrier and making a series of explosive roars.

A portion of the black liquid that had not yet burned stuck to the magic barrier above his head.

At the same time, a pungent smell reached everyone's nose.

Toxic gas? The wizards who had studied poison gas magic noticed it when it invaded the barrier and immediately held their breath in alertness.

Lin En quickly recognized the black liquid that had not yet been fully burned, and his expression was both astonished and surprised.

"Wait...could this be...oil?!"

"Oil? What is that?" Dennis and others were confused. It was another word they had never heard of before.

"A very critical liquid fuel." Lynn answered.

What is oil? It is the blood of industry, the source of power, and one of the most important cornerstones of modernization. In addition to being used as fuel, it can also be made into plastics, asphalt, synthetic rubber, and more.

Although the wizarding land is now powered by magic-powered internal combustion engines, which convert hydrogen into magic and cause gas explosions to provide power, and are much more efficient than liquid fuels, cost is a big problem.

For example, a crystalline magic stone of standard diameter, worth three magic gold coins, can only provide the airship with five days of flight fuel.

If it weren't for the war, the parliament would have supported them regardless of the cost, and even used up the magic stone reserves accumulated in the past to continue to supply the consumption of hundreds of airships.

Once the process of magicization is extended to the entire Kingdom of Hadratha, magic stones cannot be the mainstream.

Oil is a good substitute, and he had asked the kingdom's spies to pay attention to it before. However, oil exploration is not an easy task, and no news has been reported back so far.

Lin En had never thought that traces of oil would be found in this war, and that it would be used directly as kerosene. This was simply a waste of resources! (End of this chapter)