Becoming The Apocalypse Master With A Dual Cultivation Manual - Chapter 93: It’s Official

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.

It’s a story that happened long, long ago, in a continent far, far away, about gods and mortals, sword and magic, war and peace, and of course love and hatred.

Amon was a poor miner’s son in a remote town in the kingdom of Hittite. Along with the discovery of a marvelous gem, his fate was changed. People on this land called it Gods’ Tear. But wait, what were the gods? It was said that the gods created the world. Then who created the gods?

Forced by the tantalizing fate, Amon had to struggle to find out the truth behind this world of magic and gods……

- Description from Novelupdates

In 2177, the world changed forever. The first full-dive VRMMORPG, 'Eclipse Online', was released.With its breathtaking graphics and adventures, countless players and already established guilds flocked to the game, which stunned the entire world and forced the largest conglomerates to act immediately after gold could be bought with money.It was supposed to be the future of gaming.For Yone, it was the cause of his destruction.Starting over once more, he has entered this “living game” again to control his own fate.This time, he will not be controlled by others and will instead walk his own path.“Kill them till they are allies”This was Yone's infamous phrase as he will rise from just an assassin expert to an unprecedented peak in this life.

This crossing is so strange, death crossing, game crossing, etc. are probably barely acceptable, but why can you cross even if the fish tank is broken?

and actually passed through the magic tree in “OVERLORD” that is said to be able to destroy the world?

No! It is sad enough to regenerate into a plant. The protagonist, Ainz Ur Gong, the undead king, has also accepted the adventurer’s guild mission and wants to kill me!

I want to change my destiny! Live! I want to-surrender!

Ainz: Since he has accepted the job commission from the Adventurer’s Guild, deliberate failure is detrimental to the prestige of Ainz Ul Christine (the “surrender” button has been deducted)

actually died as soon as he crossed, but there is still a chance to return~ from the beginning of the magic tree to this world.

I must change my destiny this time! Live!

- Description from novelbuddy