Although the energy within the protection area of the ring city comes from the gray fog, which is transformed by the suppression of the tower, theoretically the gray fog does not disperse, and the energy of the ring city is inexhaustible.

But for the magic circle, it is not enough to have energy, after all, the range of energy that each magic circle can attract is limited, and there will be an impact between adjacent magic circles, which also leads to the speed at which the magic circle gathers energy, which can not keep up with the speed of consumption.

What's even more urgent is that the mental power of the spellcasters has been somewhat unable to keep up.

Although it is said that the casters of this world rely on the power of the magic circle that has almost reached the extreme, so that the strength they can exert has been forcibly improved to a great level, but there is also a price to pay for manipulating the power beyond their own limits, and when manipulating spells, the casters have to pay three times the mental power to control the spells.

Crossing a large realm to manipulate spells, even with the assistance of the magic circle, the caster's mental power consumption speed is already very fast, and if it is tripled, the speed of consumption is even more terrifying, from the beginning of the activation of the magic circle to the present, but in just two and a half minutes, all the casters have been drained of spiritual power.

But that was enough, the first soldiers to arrive at the temporary defense line on the outskirts were veterans of the Kuroshio Tide invasion many times, and they had a lot of experience in dealing with these gray beasts, and after the spellcasters blocked most of the gray beasts for them, the veterans quickly entered the combat state, both physically and mentally.

When the spellcasters ended their spells one after another, in the face of the impact of dozens of times the gray beasts, the veterans still withstood the attack perfectly, and did not rout because of the loss of spell support.

Of course, the biggest contributor is the third batch of urban defense equipment.

Previously, the transport team of Blue City had already sent two rounds of materials to the temporary defense line of the front line, the first batch was mainly a variety of spell-casting materials, as well as a small number of small city defense equipment, such as bows and arrows, crossbow arrows, spear-throwing, throwing axes and other projectile weapons, the second batch of materials were still mainly spell-casting materials, and also brought some enchantable building materials to further strengthen the walls of the temporary defense line.

And the third batch of materials, except for a small number of potions and ointments, the rest are all kinds of city defense equipment!

At the same time, eighty percent of the members of the transport team remained on the front line, turning into engineering troops, one after another trebuchets rose from the ground, one after another crossbow machines were erected at the head of the city, and even the spellcasters even opened a row of small holes in the city wall, and set up a roar of wind and fire from the embers around the city!

This kind of large-scale city defense equipment from the hands of the dwarves has a hideous shape, and it is equipped with special fuel inside, and the flames that ignite it can even be avoided by black beasts, and the special nozzles with strong power can make the wind and fire roar out of fan-shaped flames up to fifty meters away, considering the number of gray beasts under the city wall, a spray can take away at least hundreds of gray beasts!

"Isn't it too early to roar now?"

At the head of the city, the scribe's expression was a little hesitant, these wind and fire roars were bought from the dwarves, those dwarves were very shrewd, and the price of the wind and fire roar was about the same as that of giving it away for free, but the special fuel it used was sold expensively, and every year Blue City had to pay a lot of resources to exchange it for enough fuel with the embers around the city.

"The sooner you use it, the better, use the wind and fire roar to burn money, but if you don't use the wind and fire roar, it will cost your life!"

There was not much pity in Sawyer's tone, but the flat tone shocked the hearts of everyone around him, and a special feeling rose from his heart.

With the assistance of the wind and fire roar, even if the frequency of flame spraying is not high, it still greatly reduces the pressure on the city head, and in the rear, the city of Blue City also shoots a rain of arrows again, and the middle and low-level spellcasters who followed the transport team to the temporary defense line of the front line also began to cast spells, making the defense line of the front line more stable.

The battle is getting stalemate......

Or rather, into garbage time.

The soldiers and spellcasters on the front line consume physical and mental power, machines all kinds of city defense materials, and the endless black tide consumes the life of the gray beast, for three whole days, the entire outer defense line is foggy, that is the gray fog turned into after the death of the gray beast, there are too many of them, so that the power of the tower can not be transformed in an instant, and it can only be temporarily suppressed into a white mist that is harmless to the human body, but it makes the front line have the illusion of a fairyland.

For the soldiers and spellcasters on the front line, as well as the adventurers who joined later, this is definitely not a fairyland.

Resisting the Little Kuroshio is not as dangerous as the ordinary Kuroshio and the Super Kuroshio, and when fighting, you only need to swing your weapon mechanically or build a spell, until you run out of strength and exhaust your mental power, or if you are injured carelessly, you will be replaced by others.

To put it simply, it is extremely boring, and the only entertainment is the "sound and light show" of the strong people who rush out of the city wall.

When it was determined that the defense lines were completely stabilized, Sawa rushed out with a kind of strong man, and more than three hundred knights with titles, thousands, tens of thousands of knights and knights, smashed into the tide of gray beasts like meteorites.

In the face of the hordes of gray beasts, the knights were not afraid at all, the knights of their own strengthened system roared, their bodies skyrocketed, and they turned into small giants three or five meters high, more like fierce beasts than berserk beasts, a simple first-level straight punch, a single step, can take the lives of several gray beasts.

What is even more eye-catching is the knights who are armed and formed, when they condense their armament, they completely give up the quality, but pursue the body shape to the extreme, each wielding a weapon more than ten meters or even tens of meters long, carrying the weapon around a circle, and there is a blank around them.

And, of course, there is our son of the world, Gregory, who is dressed in flame armor and holds the proof of flame, and his body has also swelled to a height of more than five meters with the support of the power of the original fire, as if he is descending from the god of fire, and each attack can bring out a storm of fire, and the rising flames are shrouded in a layer of white mist, turning into a walking flaming hell.

And the most eye-catching are Sawyer and the other two lords.

The mysteries comprehended by the two lords belong to their own strengthening system, and after rushing into the herd, they directly transform into giants more than ten meters tall, and they don't need any skills at all when dealing with gray beasts, they only need to walk around, and they can bring pieces of death.

And Sawa is the other extreme, his body shape has not changed, and there is no forty-meter-long big knife in his hand, he just walks calmly in the herd, but all the gray beasts within a hundred meters of him are instantly torn apart, looking from a distance, it seems that the endless beasts are actively avoiding Sawyer, but the fog on the edge of the blank makes people know that it is not that there are no gray beasts approaching Sawyer, but the gray beasts that are trying to get close to him are all taking their lives in an instant when they step into the "forbidden area".