On the wall of the "Fortress on which the Sun Never Sets", the old man of the Ferida family was not relieved because the siege vehicle was destroyed, and he still paid attention to the changes in the formation of the Demon King Army.

There was a horn sound behind the Demon King Army, this kind of sound has never been heard, and it is on the battlefield that these horn sounds are relied on for army scheduling, after all, such a big battlefield, only in this way can everyone hear it.

In fact, it is the same on the human side, the difference is that humans use drums here, and the drums of different rhythms convey different messages, and the team leader who can understand the drum beat information then transmits the information to his subordinates, and the huge number of troops is dispatched in this way.

This time, the sound of the horn from the rear of the Demon King's army was obviously much longer, which meant that the amount of information transmitted this time was greater.

The human side doesn't know what kind of information the Demon King's army's horn contains, so they can only guess through the change of formation.

The old man squinted his eyes as the Demon King's army changed formations, and the soldiers who were originally scattered throughout the battlefield began to gather in different directions, and even the towers and the remaining siege vehicles began to turn.

It is not difficult to see the purpose of the Demon King Army, they chose to abandon the attack on the long walls of the "Sun Never Sets Fortress", and all the troops began to move closer to the three fortress cities.

The Demon King Army gradually formed three major groups, gathered all the elites and heavy weapons, and began to concentrate their forces on attacking the three cities.

After the previous battle, it is not difficult to see that the defense of these city walls seems to be weaker than the three major fortress cities, but in fact it is not weak at all, this "fortress where the sun never sets" is a whole, and the whole body is affected by a trigger, and when attacking any section of the city wall, it is the power of the entire fortress that you have to face.

What's more, now that the Demon King Army has consumed too much vital power, it is better to concentrate all the remaining forces on the three major fortress cities.

Yes, all three cities are real war fortresses that can never be easily captured, but there is an advantage to attacking them.

The Demon King Army also continued to collect all kinds of information when attacking, and they had already figured out that there was a giant magic crystal in the center of these three cities, and this magic crystal was the core of maintaining the entire linkage defense magic array.

An ordinary magic array may have only one core, but this incomparably huge linkage magic array must be activated with three cores, and these three magic crystals are not comparable to the small magic crystals in those bunkers on the city wall, this is the absolute core.

Once any of them are destroyed, the entire linkage magic will be invalidated, and there will not even be a substitute to replace the core, as long as any of the cores can be destroyed, the "Sunset Fortress" will become a turtle without a turtle shell, and it will be considered to be captured.

This Demon King Army guessed correctly, any one of these magic crystals is extremely important, of course, the human army itself knows this very well, this must not be missed.

That's why the three giant magic crystals will be placed in the center of the three fortress cities, which is already the safest place on the entire battlefield.

As the Demon King Army began to gather towards the three major fortress cities, the soldiers on the human side also began to frantically flock to the three cities, which were not so easy to capture.

Each of the three cities has its own characteristics, and the "Mithril City" itself is the ultimate weapon of mankind, and the city no longer has any intention of hiding its strength after it has come to prominence.

The biggest role of the "Silver Light City" is to kill the important target of the Demon King Army, and the silver light generated after gathering energy is almost indestructible, but this time the "Silver Light City" did not use the kind of attack that is enough to kill the dragon in one blow.

The amount of energy required to charge that would be too long for the human side to consume, and the city's targets were mainly focused on the heavy combat units that the Demon King's army was constantly approaching the city walls, such as siege engines and towers, as well as some of the more difficult large monsters that did not have the terrifying defensive power of dragons.

Such an attack is simply impossible to resist, almost one shot at a time, but fortunately, the cooldown time required for each launch is still very long.

But the "Silver Light City" is also in a state of flux right now, because there is a section of the city wall that has collapsed in half.

This section is the gap that the red dragon smashed when it fell, and the half-collapsed city wall is not so difficult for the Demon King Army to climb, many Demon King Army rushed into the city wall along here, and the human garrison also hit this gap, and the Demon King Army was resolutely not allowed to rush in.

Both sides had left countless corpses here, but the gap grew bigger and bigger as time went on, and more and more demon kings followed the gap to destroy the city walls and try to storm the fortress.

Another city, the "Emerald City", is much smaller in size, but the walls of this city are the thickest, and it can even be said that the whole city is completely walled, and there are no living quarters at all.

Moreover, this city wall made entirely of jade rough stones is so strong and terrifying that it can hardly be destroyed, and the difficulty of climbing is extremely high, and many demons who can climb up the city wall have no way to take this kind of city wall.

The role of the "Emerald City" is not low, it can activate the refining magic array below from time to time, and replenish the jade here to the damaged parts of the city wall, which is equivalent to giving the city wall a certain self-healing ability, which can ensure that this protracted battle will continue to be fought.

It is also the existence of the "Emerald City" that makes it difficult for the city wall to be destroyed, and even the gap in the "Silver Light City" is difficult to expand.

Finally, there is the "Iron Soldier City" in the center, which is the core of the "Fortress on the Sun", but the area is even larger than the other two cities combined.

The city has no special abilities, just the simplest of violent force attacks.

The walls of the "Iron Soldier City" are in the shape of a ladder, and the different stairs are densely packed with a variety of weapons, the most of which are magic crystal cannons and siege crossbows, and there are also trebuchets and other defense weapons.

The stepped city wall can maximize every inch of space, so that all weapons can continue to attack without affecting each other, except for the giant magic crystal cannon destroyed by Andura, the remaining two giant magic crystal cannons are also in operation, and each cannon that falls in the demon king army will produce a violent explosion.

All the giant crossbows can clear a space in the Demon King's army with a single salvo, and with no skill, the city is a complete war fortress, with weapons on every inch of the walls.

But the Demon King Army gathered in front of this city was also the largest, and no one was afraid of this dense artillery fire, and everyone had only one option: to move forward.