Emperor of Solo Play - Chapter 6 : Secret of the Expert (1).

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.

Alec found himself reincarnated into a world where magic reigned supreme.

He was initially confused by the turn of events, but little did he know that this was just the beginning of a much more extraordinary journey.

As fate would have it, he soon discovered that he was the illegitimate son of one of the most influential families in the capital, the Blaze Clan but His grandfather, taking on the responsibility, cared for him until he was old enough to embark on his path as a mage.

Ironically, Alec never truly grasped the significance of his family's ancient secrets, dismissing them as trivial.

However, everything changed when he awakened his dormant system and gain abilities that made him unique.

From that moment on, he dedicated himself to becoming one of the world's most renowned mages, all while working towards fulfilling his grandfather's unfulfilled aspirations and carrying on the golem mages' legacy.

……………………………………………………………

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