My Ultimate Life-Stealing System Made Me Invincible - Chapter 9: Finally Cleared the Dungeon.

Vid: My time at Hogwarts is only seven years, and excluding holidays, that's only 266 weeks! Even if I could thoroughly read one book a week, 266 weeks is only 266 books! How many Magic Books are there in the Hogwarts library? Thousands upon thousands!Time waits for no one, so how can I not seize the time to study?! I will not allow anyone to disrupt my study environment—not even the Dark Lord!

When he woke up, Zhou Yi became the jailer of the Heavenly Prison.

Fortunately, the fruit of longevity, but there is no way to protect the Tao!

In the chaotic world of the Xiuxian world, monsters and monsters are rampant, and there are many dangers. Zhou Yi decided to hide and practice for hundreds of thousands of years!

The situation is changing, time is passing.

The child who was let go a hundred years ago became the founder of the country.

The young man who was instructed a thousand years ago became the Supreme Elder of the Immortal Sect.

The pet that was raised 10,000 years ago has become an exotic and peerless demon king.

This is the story of a mortal who is immortal, sitting and watching the vicissitudes of life, the change of brokerage, and finally becoming the immortal god of immortality!

- 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.

Shenwu mainland, Yangwu worships God. A generation of Tianjiao, Wu Sheng was born again. Too really water, refining the body. Boxing the world, feet and arrogance. The celestial emperor, the law is empty. “Dare to despise the brothers, all killed!” “The woman who dares to move the brother, has been sleeping!” “Brother is just a myth, no one!” – from the quotations of the Emperor Lingfeng. The Supreme Demon is a very popular fantasy fantasy type written by the author, and tells the vivid story of the Supreme Devil.

- Description from zhuishubox (translated)