"Yes... their numbers are too high, and it may turn dangerous for us once the invasion there starts in the full might. They might drown us in pure numbers, which could cause pretty terrible damages to us."

I stated.

"What strategy do you propose, General?"

I ask.

"Simple guerilla warfare. We will lure them to the predestined locations and kill them in large numbers with traps or with bombardment from Voidships or Anti-Matter Magicule Canon Batteries. Afterward, we can start the invasion with full force. We should focus on the most populous locations and species, such as goblins, kobolds, and orcs. They are the main force of this primitive nation."

Proposed General Zagan, to which I nodded.

"Try to dispose of Hill Giants too... each of them is pinnacle Commander Level, and their defensive abilities are terrifying. They would cause a lot of damage to our troops."

Average Hill Giant that was the pinnacle of Commander Level would need around four to six pinnacle High-Class devils to kill it. When it came to Hydralisk Mechs, then somewhere between ten to fifteen would be needed, which is a pretty high number.

That was mainly thanks to their extremely high defensive abilities and vitality; they were troublesome opponents. I wanted to dispose of their tribes through traps and other means such as bombardment from arcanotech gadgets as that would be the easiest way to finish them off.

"I will give it my best, My Lord. Now, if you excuse me."

Said General Zagan as he bowed slightly and exited the room.

"Hopefully, this entire thing will end as soon as possible... it is becoming too annoying, and I want to return to the Underworld."

I muttered to myself as I was left alone in my room.

"Are you again sulking, Zeo?"

Asked a cheerful voice of Venelana, who had just now entered the room.

"Yeh, probably... it is annoying, you know? If not for the lack of Ultimate-Class powerhouses on my side, I wouldn't come here to fight with a bunch of barbarians and monsters. While this expedition gave me some combat experiences, it is boring at the same time."

I said to her as Vena sat down across me.

"Hmm... I can relate to that."

Muttered Venelana.

"Don't worry. Soon entire thing will end, and we will return home. Then I will return here when I reach Satan-Class to clean the seas out of the monsters. I swear, I will join invasions to strong or interesting places, not ones like this."

I said to her.

Essentially, when the Central Region of the Yestera Mainland is conquered, Western Region, Eastern Region, and Northern Region would fall without any resistance, as they are in the same state as the Southern Region, which fell to me within one month, so no threat.

"Do you want to go on a date when we return to the Underworld?"

I asked out of nowhere, to which Venelana looked a bit surprised, at least on the surface. I bet she was shocked, as I was not a proactive person when it came to our relationships. The main initiative always came from Vena, something I was thankful for.

Taken from Royal Road, this narrative should be reported if found on Amazon.

"Yes, that would be nice."

Answered her with a beautiful smile.

"I heard Agreas Island has a beautiful environment... maybe we could go and take a look."

The most distinctive feature of Agreas Island is that it appears to be a giant floating island suspended in the sky. A popular tourist resort is also the place that controls the airflow in the Underworld.

On top of that, it contains the essential crystals of the highest quality that is used to create both the Evil Pieces and Brave Saints in the future.

So I will be taking a sample of them to conduct some research. I want to see the extent of them. The creation of Evil Pieces is unnecessary and would be a catastrophe right now, as I cannot influence their usage, to minimalize it. It would be best if they were invented after a specific time when my voice would be most important for all Devils.

"I heard that Agreas is a wonderful place. I always wanted to visit it..."

Muttered Venelana as she looked at me.

Afterward, we spent several hours discussing various things to do after returning to the Underworld.

***

Several days later, General Zagan began his guerilla warfare against the primitive kingdom of orcs and other similar species.

I gave him control over all Voidships and the entire Artillery Battalion, which consisted of more than two hundred Anti-Matter Magicule Canon Batteries, and he gave me brilliant results.

As predicted, just with a slight provocation, he managed to rule several hundreds of thousands of orcs, trolls, and ogres into a trap, as they thought that somebody was attacking their territory and lured them to a remote location, where Anti-Matter Magicule Canon Batteries and Voidships tore them to shreds.

The second thing that happened was the continuous process of sending assassins and assassinations of chieftains of tribes that didn't have good relations among themselves to create internal strife and conflicts.

Most of the races that were in this nation were beyond stupid and waged war among themselves, even if they were allies. So when something like an assassination of a chieftain happened, the next day they marched to attack their rival, they thought he was behind the act.

Third thing, several bigger tribes of Hill Giants and Trolls were completely annihilated personally by General Zagan, General Amyke, and Lord Mephisto Pheles working together. That removed probably the biggest obstacle to the successful invasion of the Central Region.

Still, after one week, of this operation, the so-called King noticed something and ordered all tribes to stand down and prepare for an attack.

I must admit that the Orc ruling this nation was a pretty smart one compared to his compatriots to see danger behind. Still, it was already too late, as all major operations that needed to be done were already performed, and now the final push into the Central Region could start.