Oh my god! The goddess secretly gave birth to three obedient daughters for me - Chapter 824 - 844: Disappeared without a Trace

Xiao Nanfeng has a deeply held secret: he retains memories of his past life on Earth. Trained as a scholar and wise beyond his years, he leverages his understanding to free himself from captivity and embarks on the path of cultivation. His goal is to find his missing parents, ten years lost. Loyal allies will accompany him, and fierce enemies will deter him—but talented cultivator though he might be, Xiao Nanfeng's greatest strength has always been his mind.

Original Blurb: Beneath the vast firmament, the brilliance of an era is but a fleeting moment, a flash of fireworks that vanishes in the blink of an eye. Look down upon the land, through countless ages, and witness the rise and fall of civilizations. Immortal sects, vast empires, sanctuary and holy ground—all are but specks of dust against the backdrop of the heavens; the glory of millennia, reduced to ashes. Yet from the depths of ruin, new sparks emerge. You and I, we strive to become towering trees that would pierce through the heavens. What lies beyond the celestial dome?

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The celestial celestial beings who lived for more than 100,000 years were born and reborn in a small monk in a human world.
His motto: “It’s not as good as a medicinal medicine for ten years of hard work.” “Even if you practice a copper-iron bone, it’s not enough for my soldier’s attack.”

- Description from Novelupdates

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.