Sanctuary: Safe Haven - Chapter 356: Realm of Hell

One day, when a novelist woke up from a restless sleep,he realized that he had transformed into his 12-year-old self.

Aiden Nightshade was raised as an assassin since he was young and he had become known to the world and many feared him. This talent in assassination gave him the title of the Reaper, but his cause of death wasn’t something anyone could have expected...

But the universe brought him back to another world.

In this world, he discovered that people have different powers that he had never seen before, those who had them were called the Awakened.

To gain power, the awakened had to go to a place called the Otherworld, and clear trials that were given to them.

Using his experience as an assassin and using new skills which he couldn’t dream of before, he decided to become the strongest awakened in this new world.

……………………………………………………………

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In the world of dragons and snakes, the talented but congenitally sick martial arts master was reborn as the sole heir of the 19th-century Canadian manor owner. He thought he would make money by practicing boxing, but he took advantage of the industrial revolution to become a giant of the times. The opened template.

In the end, the original owner was a hopelessly sick and consumptive ghost! I am still a bastard having an affair with a gardener…

Wait, what’s up with the claw?

James Howlett looked at the bone claws protruding from between his fingers, and became more and more worried about his future.

- Description from novelbuddy

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.