From A Stronghold NPC To The Final BOSS - Chapter 555 - : 554 the long river of rules

VOLK SMAAAAASSH!Reincarnated with a body like a nuclear bomb, let's turn this magical world into a nuclear wasteland!As someone who loved fighting, Volk Mogger was the most miserable of them all.Born with a small frame, tiny limbs, and underdeveloped muscles, he struggled to grasp anything that was taught to him. He was relegated to merely watching others fight—whether on the internet, on television, or in real life.One day, while riding in his wheelchair, he was abducted and taken to a strange place for a radioactive experiment, which ultimately failed.However, Volk soon discovered that he had been reincarnated in a magical world as a member of an Orc horde, which was hunted by higher life forms despite merely wanting to establish a land where they could honor their traditions and build a home alongside their symbiotic partners, the Elven Witch races.Suddenly, a system screen appeared before Volk, announcing that he had acquired the power to transform into an invincible radioactive titan who yearns to be the strongest of them all.However, this transformation had a time limit, and to extend that limit, he had to win! But win what?Ding!| Beat up the Orcs thief who stole your spoil and a chance to have a wife!| Reward: Extend the radioactive time to 2 minutes.| Failure: Minus 1 minute.| Current radioactive time: 2 minutes. |

A recurring nightmare afflicted Khan's nights since the Second Impact. His dreams replayed the scenes of the crash of the Nak's spaceship, an alien race that the humans had defeated five hundred years ago.

One day he suddenly found himself in hell.
All he had was the desire to live and a predation ability.
From the first to the ninth thousand circles of hell, he absorbed dozens, hundreds of thousands of demons.
Even the seven great dukes of hell bowed down before him.

– Why would you wish to go back? Doesn’t his highness have everything that’s in Hell?
– What do I have?

Nothing to eat, nothing to enjoy!
The only things in Hell are the barren lands and terrible demons!

“I’m going back.”

After ten thousand years he returns to Earth.

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.