The Ruler Of Darkness - Chapter 1Book 7:

Nik Faran, a son of the miserable harlot that lead a life of a miserable gigolo. His birth father is one of the top swordsmen that gave his mother the glory of entering his chamber now remained unknown.Passing years allowed Nik to polish his skills as a prostitute before he was suddenly made aware of the rumour that was the mythical Incubus Society.

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.

Military technology is an important criterion for measuring the strength of a country’s national defense.

Powerful weapons and equipment can kill thousands of troops, kill thousands of miles away, and redefine war.

Powerful weapons and equipment can defend the territory, resist foreign enemies, protect Guotai and Min’an, and protect the prosperity of the world.

I am willing to forge a sword for the rejuvenation of this great country, and I am willing to forge the Great Wall for the peace of this country.

Holding on to my sword, I will smash the thorns and defeat the enemy.

If you guard my Great Wall, you will be able to defeat the enemy and make good news.

Let’s see how a young man creates an era of military domination 2.0.

- Description from Qidian