The Innkeeper - Chapter 1493: Purinex

Reborn in a parallel world, this place is imbued with eeriness everywhere... Do not enter the bathroom after midnight. At two in the morning, the sound of knocking resonates on time. A woman, haggard and emaciated, always stands with her back to oneself. Encountered a strange event? Lucky for me, I can Rewind! This is the story of a Reincarnator, carefully navigating a reality invaded by the bizarre, combating the strange with bizarre poses.

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.

On Terra, everyone has a 58% chance to “Awaken” as a Traveler—a chosen few who can access mystical portals called Flumes, allowing them to travel to Genovia, a world filled with unimaginable power, chaos, and danger. But not everyone gets to be a hero.Born into a struggling family with nothing but ragged clothes and a bleak future, Aoni Thurston, a total nobody with a humiliating One-Star Potential and G- stats across the board, knows his only chance at survival hinges on unlocking his hidden ability, something which all Traveler’s are gifted “Attributes.”But Aoni’s Attribute, “Progression,” holds a secret—a power to bend the rules of his ruthless reality. Each small victory, every step forward, earns him mysterious Progress Points, enabling him to transform his weaknesses into strength. Surviving the unforgiving snows of his desolate Territory, he faces isolation, despair, and near-death, all while unraveling the potential of his Attribute.In a world where power is everything, can Aoni claw his way from obscurity to greatness, or will the system grind him into dust? His future is uncertain, but one thing is clear—everything in his world can change through his Attribute: Progression.

This was the great era of vast warships and the Star River, a time when the multi-universe was shattered and countless Cosmic Fragments were scattered across the void, forming the boundless Shattered Starry Sea.Immortal Domain Dao soldiers, mechanical gods, golden giants, wizard Dominators…An endless array of strange civilizations.Starry Sea Oddity, Genetic Potions, exoskeletal armors, Floating Land Origin…Treasures that could be found everywhere.Spectral Shuttle, Spectral Airship, Spectral Warship, Escort Ships, Battleships, Star-Annihilating Starships, hyperdimensional mother ships…The clearly stratified Xinhuo warships.Song Chi held a Zhu Tian Ruins Market in his hand and engaged in interstellar trade with the countless peoples of the Starry Sea.What? Titanium Crystals are worthless in your Star Domain? I’ll take them all, damn it, this is a strategic resource!You call this a chunk of iron? This is Mixed Elemental Copper, the ultimate Enhancement resource!Ordinary ship cannon? Isn’t this a golden Star-Annihilating Cannon? Quick… I’ll buy it!…Stretching across the stars, starting from the flame of human civilization.