My different world is game mode

[Concussion Shield] - Uses high-frequency sound waves to form a shield around the target, reducing the enemy's attack effect.

[High frequency/low frequency] - Emit high-frequency sound waves in a small range, causing indiscriminate damage and stun effects to surrounding units; emit low-frequency sound waves in a large range, causing indiscriminate deceleration effects to all units.

[Command Halo] - Improve the basic attributes of nearby friendly troops.

[Revenge Implosion] - triggers a strong sonic boom in the enemy's body, causing huge damage. This skill has a probability of directly killing the target. When this skill is launched against a target that meets the 'revenge conditions', the probability of instant death effects increases.

Compared to Vivian's treatment as a devil.

Levi's four skills obviously don't have such outrageous effects.

However, except for the dungeon-oriented command aura, the other three skills are also very consistent with his awakener memory.

In particular, [Revengeful Implosion], this ultimate move, is almost a skill specifically designed to allow him to take revenge on the aberrations.

It is enough to see the hatred in this man's heart for the aberrations.

After consuming the two hero quotas in [Underground Fortress], Lindsay was temporarily out of work.

He asked about Tieyu's care of the wounded.

After confirming that the medical system was functioning normally and that there was nothing he needed help with, Lindsay went to the Zerg to dispose of the bodies of the aberrations and collect prey materials in the flower fields.

On the ground, the sun rises and sets.

The underground world is illuminated by torches, maintaining a constant atmosphere.

Wait until a full day has passed.

The upgrade progress bar of the [Underground Fortress] has been completely completed, and the city has officially been upgraded to the [Underground City] era.

Rumble——

The evolution of this civilization is extraordinary, and it is not far behind the [Forest City].

The relatively simple rock building structures of a day ago were replaced with more solid and corrosion-resistant granite. Sculptures and murals such as minotaurs, harpies, or crypt dragons have become common in cities.

At the same time, after becoming a [dungeon].

The improvements brought by civilization level are not limited to buildings.

Along with the violent underground roar, pieces of hard and regular basalt bricks began to appear on the walls of the cave that originally housed the city.

They form defenses and civilization, turning this place into a real dungeon.

Rather than the city in a cave in the past.

On top of the dome, at regular intervals, there are fluorescent stones that emit light.

Unless you are indoors, you can save even the torches for lighting when walking on the streets of the underground city.

At this moment.

Lindsay happens to be right on the square in the middle of the city.

He felt something in his heart and turned around to look.

"..."

"hehe."

Lindsay's face showed a look that was indeed the case.

After the upgrade was completed, the city hall of the [Underground Fortress] also changed its appearance. Smooth and hard obsidian forms an underground castle!

In the central hall of the castle, a majestic and straight long black staircase extends down and connects with the city streets. Its structure is as straight as a sword, as if a long sword cuts across the earth.

End of field of view.

Between the thick and majestic Doric columns, under the blood-red flag fluttering in the wind.

A ferocious throne made of human skulls sits in the dark castle hall.

The smell of blood and power emanates from this throne.

Lindsay was standing on this side of the square, and with one glance, he instinctively told him that this was not a place where serious people would stay.

"Now, it has truly become the Demon King's dungeon."

Lindsay chuckled subtly as she opened the building list.

【Demon King's Castle】

Construction cost: 800 stone, 500 dark energy

Effect: Upgrade the Demon King's Palace to Demon King's City, which is the residence and command center of the Dungeon Demon King. While in the palace, the Demon King can command his units from a distance.

【Evil Altar】

Construction cost: 500 stones, 100 human sacrifices

Effect: After members of the underground city kill the enemy, the evil altar will absorb the soul power of the deceased and use it to heal the injuries of the members of the underground city.

【Soul Pool】

Construction cost: 200 stones, 50 human sacrifices

Effect: Convert the soul power in the evil altar into dark energy.

【Cemetery】

Construction cost: 400 stone, 200 dark energy

Effect: Transport the corpse to the necropolis, where you can summon undead units after paying dark energy.

【Demonized Blacksmith Shop】

Construction cost: 300 stone, 150 dark energy

Effect: Create and upgrade demon weapons and armor.

【Tower of Shadow】

Construction cost: 350 stone, 250 dark energy

Effect: An advanced defensive building that can emit dark energy to attack enemy units and enhance the defense of castles or underground mazes.

【Devil's Gate】

Construction cost: 450 stone, 350 dark energy

Effect: By expending dark energy, you can summon demons from another world to work for the Demon King. If you summon a high-level demon, the opponent may rebel, so use it with caution!

【Curse Library】

Construction cost: 300 stones, 400 gold coins, 200 dark energy

Effect: Research and store dark knowledge and forbidden spells, and be able to train dark magicians.

【Soul-Eating Prison】

Construction cost: 400 stone, 300 dark energy

Effect: Imprison enemy heroes and important figures, and extract their power to strengthen the defense and attack power of the Demon King's City.

"..."

"Kill the enemy, absorb their soul power, and then use it to summon the undead and demons."

The core resource of the third stage [Dungeon] is the soul power after killing.

It is indeed not ordinary evil.

But Lindsay has experienced so many things, and he has long seen through this problem in his heart.

"The key to good and evil lies in the user."

"As long as you can control this power and use it in the right direction, there will be no problem!"

After confirming the situation.

Lindsay walked to the central square in front of the Demon King's City.

He ordered Vivian to call the soldiers and commanders in the city and launched his first speech in the [Dungeon].

"Everyone, you can see the changes in the city now!"

"This is the second city for humans that I plan to build after the Forest City! And your work here will change from crusades and expeditions to maintaining the normal development of the city."

After more than half a year of joint war, Lindsay and the soldiers don't need to talk nonsense when communicating, just simply state the purpose.

Among the crowd, only Levi, who is eager for revenge, has a different opinion on this.

He began to get anxious when he heard this, and even took the initiative to ask:

"Lord Lindsay, what about this expedition?"

"We are obviously about to succeed, we can't, we can't suddenly stop here!"

Lindsay nodded slightly, and then he told his plan:

"A week later, I will continue to march north with the Zerg who came to support us."

"This will be the base camp for this final crusade."

"So, I will hand this place over to you, and you must protect the safety of this base camp!"