My Servant Is An Elf Knight From Another World - Chapter 45

Civilization is destroyed and records lost. Only Dudian survives in a cryogenic sleep. Three hundred years later, Dudian wakes up and must become Dean to survive. Who can he trust in this world overrun by monsters without and within?

- Description from Novelupdates

“Welcome to the Cosmos of Madness!”

Said a man with long red hair and piercing golden eyes as he descended from the stars.

“You have been chosen for a great purpose! Task! Mission! Destiny!”

He shouted dramatically as countless worlds heard his every word, from the lowest peasants to the mighty entities in the lofty palaces in the Higher Dimension.

“All of you accept your destiny as a sacrifice to Daemon Sultan, Blind Idiot God, Primordial Demiurge, Azathoth!”

And then Apocalypse descended.

***

Follow the journey of self-named Samiel Zentaur, a half-mad worshipper of the Outer Gods, on the Path of Transcendence and in his path to find himself.

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.

In his previous life, Tang Shi was a cannon fodder. For a jerk, he even turned down a blind date his father arranged for him, but finally died in the hands of his lover and half-blooded elder brother.

Before he died, his elder brother told him that the one that always went against him, teased him and used him as a bait was the one who truly loved him, also that blind date his father had arranged for him—Yan Xu.

Feeling regretful?

What would have happened if he hadn’t made that kind of choice from the very beginning?