The Royal Military Academy's Impostor Owns a Dungeon [BL] - Chapter 937: A Rude Awakening

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

For the sake of his family, Ren embarked on the popular VRMMORPG, COVENANT, that used real-time in-game currency. But being a mediocre player who only knows how to gather information, he was put in a supporting role.

As the game explodes in popularity and every multibillion-dollar company invested in the game, things have turned for the worse for Ren. Due to the amount of information he gathered, the cheats, secrets, quests, and bugs he discovered, he was silent in fear of selling the information to the other guilds.

But given a second chance, he went back in time when his father was still alive and COVENANT was just in its starting phase.

This time . . . he wouldn’t be that guy on the side who gathered information from day in and day out for ten years.

Equipped with the games knowledge he accumulated, he will become . . . an Alchemist!

Chrono Mage? Djin Master? Summoner? Necromancer?
Chaos Lord?

What good are those?

Sure they’re powerful and rare classes and sought after by guilds, but it’s the alchemist who forged artifacts and concocts rare items and potions that gets the most coins at the end of the day!

It was better than being a blacksmith or a crafter! Plus, he could use all sorts of magic without limit to race and class!

It was the ultimate class! And no one even knows it!

Liu Ergou grew up in the village and studied medical skills with his grandfather. After his grandfather died, the responsibility of treating the villagers falls on him. But an accident bestows upon him an inheritance from his great-grandfather, which sets him on the path to invincibility!

[You have been chosen as a Lord of the Intergalactic Lord Project.] [Your reward: A floating island to call your own.] [Your mission: Build your kingdom, summon legendary allies, and dominate the worlds!] [Your advantage: An SSS-grade Ultimate Gacha System.] Atlas Blackthorn, the newly chosen Lord of a floating island, wields the power to summon legendary warriors, powerful artifacts, and, of course, waifus. With boundless ambition and the Ultimate Gacha System at his side, Atlas sets out to become the strongest Lord in all worlds. How far will his ambition take him?