The dark clouds in the sky give people an extremely strong sense of oppression.

Even if Cecilia didn't warn her, everyone present knew that this must be a huge spell bombardment.

The glow from Gollum couldn't hold back the dark clouds, and it could only come back to Cecilia's side at the moment. It can only be regarded as a small animal in the growth period now, let alone an adult, if it is calculated according to the age of the human being, I am afraid that it will only look like four or five years old, and it is not trivial to be able to have three natural abilities, but if you want to count on Gollum to help in the war, it is better to expect reinforcements from the sky.

Cecilia carefully put away her grunt and looked up at the black thunder and lightning that shone from time to time in the dark clouds.

"Can you tell what kind of magic it is?" There was no panic on William's face.

"It's acid rain." Cecilia opened her mouth and said, "After all, the skeleton mage is only a third-order, and he doesn't know much undead magic, but there are only three of them. Summoning skeletons is one, and the corpse bone recovery technique is also one, and now summoning such a large area of dark clouds, it should be acid rain. ”

"When the undead creatures gather together, they will have the power bonus of dead energy, and the intensity of acid rain will increase." It was Alyssa who spoke, her abilities were strange, and the weapon she used was also a magic spear that no one had ever seen before, but in essence she was more inclined to a magician, "It's probably a strong acid rain or something." ”

"But their magic can't be infinite forever." Cecilia whispered, "This shower depends on whether it is urgent or slow. ”

"What do you mean?" Although William knew a lot about magic, he never had a mage group under his command. Therefore, many whimsical tactics have no place to practice, and naturally there is a lack of a certain degree of awareness.

Miss Cecilia meant. If the rain is urgent, then the power will increase again. But it can't last long. "If the rain is slow, it is likely to last for a long time, but it is less powerful than the rain. …… However, whether it is slow or urgent, according to the magic damage standard, the strong acid rain can reach the damage standard of third-level magic. ”

"If it's urgent, it's a quasi-fourth-level standard?" Alfred asked.

"At least level four." It was Cecilia who answered, "But it won't take more than ten minutes." ”

"A level 4 magic attack that lasts ten minutes?" William's face finally changed.

If it's level 2 or level 3 magic, it can resist with the latest type of impact shield. After all, as the Void Principality grew stronger, some of the more important materials began to be mixed with rarer anti-magic materials. Although these anti-magic materials are not the top ones, and the amount used is not particularly large, if they are used to resist second- and third-level magic, there is still no problem, even if it is fourth-level magic, there are certain resistances and exemptions.

However, a fourth-level magic attack that lasts for ten minutes, this length of time cannot be blocked at all unless it is made of anti-magic materials of level 3 or above.

"Acid rain magic is different." Alyssa spoke. "The damage of this magic is accumulation. In other words, we had to stand in range long enough for the acid rain magic to do this power damage. And if you find a place to hide when it rains, then the power and damage of this magic are not very high. ”

"So to speak. As long as we use the mutual cover and combination of shock shields, can we survive this acid rain? William humbly asked.

"Hold on." Cecilia answered in the affirmative because she knew what William meant. "But we can't hold on."

"Why?" William was puzzled.

"It's not difficult to survive the rain for ten minutes. But the shield had to be changed almost every minute. Cecilia began, "I've already calculated. Ten minutes is exactly what it takes to block it with the shields of all the soldiers of the entire steel wing. And this acid rain has a great degree of destructiveness to the impact shield, basically the shield that supports the shield to keep out the rain is impossible to unfold the nail pile. ”

At this point, the meaning is clear.

The Bone Staircase was built to give these undead the opportunity to rush to the city wall for hand-to-hand combat. Looking at the formation of those skeleton cavalry, we can know that once the bone ladder is built, those cavalry must be the first to charge, trying to tear a hole for the skeleton infantry behind them to attack the city wall.

This is also the reason why Levi kept reminding him of the dangers of the Bone Ladder.

Abazar, on the other hand, said that these steps were not to be paid attention to. Lévy didn't understand why, but everyone else knew, because they had shock shields - as long as the stakes of the shock shield were knocked down to form an array, unless the cavalry regiment of level 7 or higher charged to attack, they would not even want to break through the defense line of the steel wings. This is also the fundamental reason why the steel wings can become the color change of all the cavalry legions in the entire Southern Continent, and it is also the reason why countless enemy countries want to steal the blueprints for the production of the impact shield.

But now, if you have to sacrifice the shock shield to resist the acid rain, then even if the acid rain stops it, how can the enemy's skeleton cavalry charge stop?

Didn't get in the way.

You can only fill it with your life.

William's brows furrowed, even if he was one of the top ten famous generals in the world, good at using tricks and strange soldiers, but he couldn't do the job of "a clever woman is difficult to cook without rice". Of course, he believed that even if the steel wings did not have an impact shield, it would not be a problem to block the charge of the skeleton cavalry, after all, the skeleton cavalry was only a third-order undead, at best, it was a quasi-fourth-level army, if the level was worse, it would only be the level of a third-level army, and it would not be a problem to block it with the steel wings that had now reached the fifth-level level.

However, this is a cavalry charge after all, and without the special ability of the shock shield, there will definitely be casualties.

Casualties can be avoided in the case of casualties, William is not willing to do so.

But before William and the others could come up with a good solution, the skeleton mages who gathered together unleashed acid rain magic.

In the cloudy sky, green rain began to fall.

"Hide!" William roared.

The steel-winged soldiers standing under the city walls immediately sought shelter from the nearest building.

Since the first time the fortress was broken, the fortress has been empty, although Cruise's touch destroyed one-third of the fortress, but this uninhabited city has a place to rest, so even if there is an army of nearly 100,000, there is no fear of having no place to rest. At this time, except for the 30,000 steel-winged soldiers on the walls of the fortress, the rest of the legions were resting for the next big battle, so when the acid rain came, it didn't have any effect on them.

What's more, they have received an order from William at this moment, and these people will not come out to cause trouble.

And the 30,000 steel-winged soldiers standing on the city wall also began to line up into ten small steel-winged formations according to Cecilia's urgent order.

There were 3,000 people in each formation, and the shields stood on each other's sides, holding only 800 guilders.

The impact shield is a heavy tower shield, one shield can accommodate three to four people to hide together, and the coverage area formed when eight hundred shields are raised is naturally not small, and four hundred people are enough to hide in three thousand six hundred people. However, the way the steel wing array raises the shield is not that the heavy shield is fully deployed, but similar to the way the white bone ladder is built: shield stacking shield, so that although the scale will be smaller, the scale of three thousand people is still enough.

And this way of stacking shields, naturally can also ensure that a shield is only partially affected each time, only need to adjust the angle of the shield and the overlapping place, a shield can be repeated three or four times. Even if it is calculated according to three times, this small steel wing array can make up to nine minutes of resistance, and as for the remaining last minute, it can only fight to completely lose eight hundred impact shields to support it.

As for Levi and the other powerhouses, they are naturally not afraid of this acid rain magic. Although William is just an ordinary person and does not have any ability to protect himself, he has a group of strong people around him, and it is more than enough to protect him.

Because of the fall of acid rain, the defenses of the entire fortress walls were almost completely destroyed.

However, the damage of this kind of large-scale magic is not divided between the enemy and the enemy at all, so the attack range of the cast spell is only limited to the fortress walls and the entire fortress, and does not expand the scope to the bone staircase that is being built.

Therefore, without any interference or obstruction, the construction speed of the Bone Staircase is obviously faster and more crazy, and almost every minute you can see that a new layer of the Bone Staircase is being built. At this time, the height of the entire white bone staircase has reached twenty floors, the height is almost seventeen meters, and the length of the spread is more than thirty meters.

I'm afraid it won't be long before the thirty-meter-high wall won't be able to hold back the army of the undead outside the fortress.

Soon, however, the undead army barely gave the defenders of the fortress to observe the progress. Because of the need to block the acid rain, the Iron Winged Defenders held their shock shields high, and those who did not raise them were also collected in the array, like eagles with their wings constricted, so that those skeleton archers had a higher chance of attacking freely. In order to avoid losses, William could only order the Abazar to retreat the steel wings on the wall, not too close to the edge of the wall.

Looking at the war situation that was originally offensive and defensive, just because the army of the undead had a group of skeleton mages, the good situation was completely suppressed and subverted, and he couldn't even fight back, William's heart was so aggrieved that he was about to vomit blood.

Ever since he became the military commander of the Void Principality, he had never fought such a war!

William's teeth are almost crushed! (To be continued.) )