Follow the trail to trace the missing residents, but fortunately, it is not long enough to recognize the direction. Yuan Mu found that although Elena had never been here, she also knew about the tunnels here.

"Elena Shrine Maiden, does Cold Cinema know the terrain of the underground tunnels?"

Elena replied, "Most of them know, including the road to the ground. However, there are also unfamiliar places, and the topography of the underground tunnels has changed greatly over a long period of time. ”

Yuan Mu still had doubts: "But there are ruins of a purgatory city in the tunnel, and there seems to be more than one, and the entrance to the tunnel that has recently appeared in the forest is also opened by demons." ”

"That's because in ancient wars, the forces of the Purgatory system used to invade the tunnels and build some cities. Although these cities were destroyed, they also had knowledge of the tunnels. ”

Yuan Mu stopped suddenly, and he thought of a serious problem.

The purgatory forces that appeared this time were obviously connected to the ancient purgatory forces, as they knew about the tunnels and some hidden places in the ancestral forest.

But there has been no purgatory-type force in the ancestral forest for a long time, where did these purgatory creatures who know the information come from? Yuan Mu thought that Lange was sacrificing at the Demon Gate, and they should have come from another continent.

The ancient purgatory cities on the ground have been destroyed, but the demons that these cities communicate with may still be there, they are on another continent.

If these demons were really the original ones, how high would they be based on their ability to fight Barbarian Ancestors such as Elbadam and Grulock?

Wouldn't it be a legend too? Yuan Mu was taken aback by his own thoughts.

Leo and Ursol saw Yuan Mu stop and ask him what had happened, and their faces changed when they heard Yuan Mu's speculation. Elena's worry flashed as well, she didn't know there were so many more situations.

However, she quickly calmed down: "The level of inhabitants of those cities is so low, and the number is far from enough, it is impossible to sacrifice them to make the legendary powerhouse come, and it is difficult to summon creatures above level 10.

Moreover, through sacrifice, such a powerful unit descends, and the high-level buildings required may not be able to be built in level 7 cities. ”

Ursol was relieved to hear this, but Leo thought of something, but his face changed slightly.

Yuan Mu shook his head: "I'm not worried that the legend will come, but every high-level hero subordinate has a powerful force, and their combat power is equally strong. I think we'd better be quick. ”

Everyone else agreed, and Elena stopped hiding her secrets and went all out to explore the path. The troops picked up speed again, and came to a remote place in the tunnel.

"My lord, there is a patrol force of the Purgatory Department ahead." Scouts come in return.

"It looks like we're in place, shall we rush over it?" Yuan Mu consulted Elena.

Elena shook her head and instructed the scout beside her to dive into the shadows, while she herself closed her eyes and listened to the message from the scout's silent worm. After waiting for a while, Elena opened her eyes.

"The scouts bypassed the patrol and found the location of the Purgatory City, which is a level 3 city, called Tarst City, we can attack"

Elena spoke out the scout's information and set off with Cold Studios' troops. Yuan Mu and the others hurriedly chased after them, and they were also worried.

Soon I saw the patrol force, which was composed of horned demons and cerberus, and the rank was not high, and they immediately raised the alarm when they saw the large force rushing over, but they were quickly overwhelmed by the cold film city and the forest troops.

Having eliminated the patrols, Elina headed straight in one direction, and on the way she also encountered some guards, but none of them were of high rank and could not stop them. Smoothly moving forward, I soon came to an underground space.

This underground space is larger than the underground space where Painted Moth City is located, and the city of Dust, which smells of sulfur and blood, is built in the middle, but the smell of blood is lunar and the smell of sulfur is not heavy. Some ruins and wreckage can still be seen outside the city, and Duster City was built on a large area of urban ruins.

Tasker City already knew about Yuan Mu's arrival and was gathering troops from outside the city into the city. From the other tunnels, some troops have also appeared and are heading towards Tarst City. Elena led the way quickly, and the purgatory-based troops didn't have time to rush back to the city.

Yuan Mu naturally wouldn't let these purgatory troops return to the city, and after attacking them separately and occupying the passage junction connecting this underground space, he led his troops to Taste City to join up.

There are many troops defending the city, in addition to the purgatory troops, there are also troops from several underground cities such as Colored Moth City. Fortunately, there were still many troops that did not come back, and they were strong enough to take the city easily.

However, Yuan Mu's brows furrowed after seeing the situation in the city.

"Any questions?" Elena spotted his anomaly.

"It's so quiet in the city, I don't see many residents."

"Could it be that he was locked up?"

Yuan Mu shook his head: "I don't know, but as long as the city is captured, I will naturally understand." ”

"That's right, let's get started." Elena was the first to command the spider troops to rush forward, she didn't trust the forest troops enough, but she didn't bother to preserve her strength, so she let her troops attack first.

Yuan Mu and the others naturally would not lag behind, the siege bear people threw stones at the city wall, and the long-range troops fired, and Erqiang and Utga also led their troops to attack the city wall.

Although the defending forces were also attacking them, they quickly fell into disadvantage under the combined attack of Cold Shadow City and the forest troops. At the current rate, the city will soon be captured.

But Elena felt too slow, and led her troops forward, asking Abba to work with her in casting magic, and the dark silver whip was pointed at the troops on a section of the city wall.

A green venom ripple exploded from it, affecting a large area of enemies, and the low-level demon boy monster was directly killed by the poison explosion, and the surviving body also became green and poisonous.

'Toxic Nova Nova! ’

With the help of the high-ranking Abbadam Shrine Maiden, Elena cast this high-level poison magic, cleansing the troops on the wall, and leaving a layer of venom on the wall.

The Inferno forces were shocked by the damage and range of the Poison Nova, and they found that the health of the poisoned units was still dropping dramatically, and the recovery troops could not recover. Wants the ranged troops to attack the shrine maiden, but is suppressed by the archer troops on the opposite side.

Yuan Mu was also taken aback, she knew that Elena was good at poison magic, but she didn't expect it to be so powerful, fortunately, Elena was now their ally.

The subordinates took advantage of this opportunity to attack the city even more fiercely, and after Elena cast a few more spells, the city was breached, and most of the purgatory troops were killed, but some underground troops chose to surrender.

Yuan Mu found that these troops were much weaker than expected, and hurriedly sent people into the city to look for them. News soon came from the subordinates, but the results made them worry that the inhabitants of several underground cities were not in the city.