This is a deep and dark world. No light can be seen in the dungeon, and the Spirit Race does not need their light. They act like ghosts, and the dark world is more suitable for them to survive. But for the invading tribes, the lack of light in the world made them feel uncomfortable. A feather clan released a lighting technique with some discomfort. But at the moment of lighting up the space, a bunch of arcane arts were used like a tsunami, instantly submerging the feather clan. "Don't light it up! They hid in the dark and attacked!" someone yelled. The spacious underground world is not a safe starting point, but a new journey that is fraught with danger. The dark space gives the spirit race a chance to hide. They hide in a hard-to-find location, and then constantly attack and release the light, creating a dark and terrifying atmosphere. This approach effectively hit the coalition forces. Whoever releases the light will die so that everyone will not easily disperse the darkness, and the unlighted space brings a huge inconvenience to everyone's vision. Although everyone is a Gentleman, and there are various methods for night vision, the truth is that dark arcane arts are more likely to work in this environment. When the two phases cancel out, the darkness is the real darkness, and it is difficult for even the Gentleman to perceive it. So a killing from the dark began to take place. After the passage blockade, a dark ambush began. People marched in the darkness and vagueness, killing, and bombarding constantly, while also suffering from the invasion from the spirit race. This kind of invasion caused great harm to the three races. But if you think that you can win this way, you are wrong. A mob general suddenly shouted: "Great red rain warrior, desperately charge!!!" "Roar! Huh!" A large group of mobs suddenly roared at the same time. Their naked upper bodies suddenly rose up with a powerful fighting spirit, and a series of totem patterns were lit up, shining with dazzling red light. Then these violent races rushed past, wild like a storm, galloping like a horse, rushing through. The arcane from the spirit race flew out and landed on the mob warriors, but the mobs ignored it and continued to advance. The strong skin and powerful source energy isolation make them extremely resistant to source force attacks. This is the root of their difficulty in cultivating the source skills, but it is also the basis for them to fight against the source spirit arcanists. Relying on a strong physique to withstand attacks from all directions, the Yu clan that was released at the same time had already taken the opportunity to make a move. Arcane arts fell one after another, covering the attack point directly and indiscriminately. I didn't need to be precise, I only needed to know the approximate direction. A painful muffled sound came out from the depths of the darkness, and several spirit race figures floated away. "Kill them!" Dozens of flying swords were raised at the same time, stabling the back of the spirit race. There is no blood, only the spirit screams aroused when the sharp blade penetrates the spirit body, and the back figure of the spirit race falling down weakly. Although only a few spirit races were killed, the morale was greatly boosted, and the most important thing was to find an effective way to solve the opponent. The cooperation of the tri-communal forces finally played a role in this dark ambush. This mode of hunting with mobs as shields, feather clan coverage, and human clan swords expanded rapidly. Following this method, everyone moved forward step by step, and soon killed the ambushing spirit clan and forced them to retreat. The dark ambusher ended faster than everyone expected. At this time, the coalition forces that had left the entrance of the cave finally walked out of the dark area, and there was a wide underground plain in front of them. The most rare thing is that there is finally light. The light comes from an artificial moon in the distance. It hangs high in the sky and emits a soft brilliance. It brings light to the dark earth and allows people to see the land under their feet. This is a barren land, and the underground world of Wanlai Caverns has no resources, only a variety of rocks. If it were not for the spirit race, no wise race would be willing to live here. At the end of the plain, you can see a tall castle standing there. Undercity! That is the Undercity. "Finally saw the Undercity." Gutian sighed. "The Spirit Race will surely perish today!" Longzel let out a cry of excitement. "Don't be too early." Su Chen poured cold water on everyone: "In the past few battles, the Promise Sect has wiped out a lot of spirit races, but it should be less than one-fifth of the total number of spirit races. Menelas Most of the spirit races have been retreated and concentrated here, and the number should be less than one hundred thousand." Hearing the number of one hundred thousand, Longzeer frowned. For the spirit race, this number is not small. After all, the strength of the spirit race is powerful, and there are often multiple servants and puppets behind each spirit race. The total number of troops also means that it may reach 300,000 or even 500,000. Coupled with geographical advantages, it is impossible to fight before the beginning. So Longzeer was a little dissatisfied: "So the Promise Sect was not killed all the way, but the Spirit Race let it come?" Danba immediately said: "Longzeer, don't be rude. These ghosts of the Spirit Race can't hit the front. They flee very quickly one by one. They are very cunning, but also very powerful, and it is not easy to kill. The Promise Sect has been able to eliminate so many spirit races before, and has done their best on the fourth. As for now, it is the spirit race that gathers the power of the whole family to fight. It is inevitable for us to be difficult to fight. We are able to gather here today, but it has delayed the success of Sect Master Su." Long Zeer said nothing at all. "But it may also hurt you because of me." Su Chen said leisurely: "I always feel that the spirit race has its own hole cards. This hole card is bound to be difficult to deal with. One carelessness may result in a loss of all sets. " Bad misfortune and good fortune are disturbing, no matter what, I will not let the good opportunity of exterminating the spirit tribe unwilling." Danba said lightly. Gu Tian snorted: "My Feather Clan soldier, I will complete Your Majesty's mission to the death." Su Chen nodded: "Since everyone's fighting spirit remains unchanged, let's fight. It's a mule or a horse, and I still have to pull it out for a walk. " With this sentence, the horn of the three clans began to sound. The soldiers of the three tribes began to line up again, preparing to attack. The mobs are good at the ground and are in the middle position. The human race and the feather race live on two wings. These are the real two wings, because no matter the human race or the feather race, they all fly in the air. It's a pity that the underground space is limited. Even if it's flying in the air, it's just a few feet off the ground. The mob warriors don't use long-range means, and they can hit it with a single vertical leap. This is the embarrassment of underground warfare. In this environment, it is indeed easier for the mob to play a role. With the formation of the three armies, the horn sounded, and the army began to move forward, approaching the Undercity step by step. When it was getting closer, the panorama of Undercity gradually came into view and became clear. This is a city with a strong spiritual style. The Undercity has no walls, and there are not many other defensive buildings in sight, only countless towers stand. These towers are the residences of the spirit races, their laboratories, and even their guardian towers. No matter where the spirit race is, as long as they reach the middle level, they can have their own guardian tower in the Undercity. And the expansion of the Undercity is also through these towers. Whenever a spirit race enters the middle level, but there is no suitable tower, a tall tower will be built on the periphery. Therefore, the number of towers is the number of the peak of the strength of the spirit race. Nearly 100,000 seats. These towers constitute the Undercity, and at the same time are the main body of the Undercity's defense. Yes, the Undercity has no other defensive measures. Tallinn is their only defensive measure, but it is also the most effective and terrifying. From Yan Tuo, Su Chen had already learned about the defense of the Undercity. According to him, every tower in the Undercity was an independent war weapon with a powerful defensive force. The spirit race fights with opponents in the tower, and the combat power can be doubled. Not only that, the tower itself can also release powerful arcane arts. The details vary depending on the towers, but the lowest level of Tallinn in the Undercity can also release five-ring arcane magic, and the highest level is the patriarch’s tower, which can release legendary arcane magic, so it is also called the legendary tower. Below the legend, there are 500 towers on the Tenth Ring Road, 1,500 on the Ninth Ring Road, 5,000 on the Eighth Ring Road, 16,000 on the Seventh Ring Road, and 27,000 on the Sixth Ring Road. There are 44,000 five-ring towers. Such a terrifying quantity makes the scalp numb even thinking about it. Fortunately, there are less than one hundred thousand spirit races, of which there are less than 40,000 of them above the middle level. Therefore, there are only less than 40,000 towers that can be activated, and the rest are decorations. But to say that it is useless is not necessarily. When a tower of the spirit tribe is destroyed, as long as the spirit tribe inside is not dead, it can be quickly replaced with another empty tall tower. "So to solve these guys, you can't fight back wherever there is an attack, but sweep all the towers indiscriminately." Su Chen said solemnly. "It's simple." Long Zeer cracked his mouth and laughed: "What I am best at is sweeping all the way." It is not wrong to describe the mob with aggression like fire. As it says, selective fighting is not what the mobs are good at. Su Chen nodded in agreement: "So, this battle will be an opportunity for the mob to show off their power." Longzeer liked Su Chen's words very much, and laughed: "Look at ours." Turn Turning his head back and shouting to the rear: "You clumsy guys haven't installed our baby? Hurry up." As a roar sounded, a series of huge tanks pushed out from the rear. Dragon Fire Cannon! The siege weapon developed by the craftsmen of the mobs with their unique craftsmanship appeared on the battlefield under the push of the mobs. In order to take it out of the complicated piping system, the mob craftsmen even had to disassemble it and bring it over, and then assemble it. Slightly disdainfully glanced at the Dragon Fire Cannon that was being launched, Gu Tianyue said, "Take ours out too." As a result, the Yu clan flew to the ground, and the same battle cannon appeared on the ground. It was the Tianyu Sunbreaker that had appeared in the battle of the Sky City guard. Although the power is not as powerful as the Dragon Fire Cannon, it is more portable and can be directly installed in the source ring. Unlike the Tyrannical Dragon Fire Cannon, the general source ring can’t fit. You can only take it apart and put it in the source ring. . Su Chen waved his hand, and a number of humanoid demon puppets also appeared, and two Titan-level demon puppets even blinked. Su Chen successively obtained a lot of skills about magic puppets from the relics of the Austrian Empire and Yongye Liuguang. After passing them to the skilled craftsmen of the Promise Sect, he gradually became unique in the making of magic puppets. Coupled with the rare metals obtained from various places, the strength of the magic puppet army of the Promise Sect was greatly increased. The most rare thing is that these magic puppets are plated with Void Tan Gold, so that they can be stored directly in the void, no matter how big they are, so the portability is one level higher than that of the Tianyu Smashing Sun Cannon. Now that the siege weapon is ready, the offense follows. No rest, no cushion. With a burst of fire, all three-community allied forces fired out all kinds of cannons.