Wandering Mercenary in an Open World - Chapter 42

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 a world where magic rules and human nations fight to survive, a 14-year-old stowaway finds himself thrust onto the frontlines of war. With no allegiance but to his own cold logic, Lugh is forced to navigate battlefields of steel, sorcery, and shadows. What begins as an escape soon becomes something far greater—whether he wills it or not.Gunmage – When spell and steel collide, a new kind of warrior is born.

Carlos Valois thought dying once was enough—until he woke up as a 10-year-old in the world of “The Dark Era,” a game he'd mastered in his previous life.Born as the last heir of a fallen noble house, Carlos discovers he's destined for a tragic fate: in six years, he'll be manipulated into joining the dark forces and killed by his own childhood friend. But this time, he has the ultimate cheat code—memories of the future.While other kids play with toys, Carlos hunts for divine legacies. Using his game knowledge, he performs an ancient ritual and steals a Demigod Mark from the thousand-year Sacred Oak—a power that should have remained hidden for decades.At 15, Carlos awakens as a Death Herald with broken stats that shouldn't be possible. Most Death Heralds are fragile summoners hiding behind weak skeletons. But Carlos combines his necromancy with stolen divine abilities, creating a hybrid build that turns him into an unstoppable force......[Skeleton Warrior has successfully evolved into Purple Thornblade Skeleton Guard!][Purple Thornblade Skeleton Guard has activated Bond: Glory of the Purple Thornblades!][Twelve Purple Thornblade Guards have formed an Undead Armored Knight Legion!].....His skeleton warriors aren't cannon fodder—they're elite undead legions enhanced beyond normal limits through secret evolution paths that took thousands of players years to discover.Every “coincidental” encounter is actually Carlos farming legendary opportunities. While his sister thinks he's just a lucky genius, Carlos systematically raids every hidden treasure, secret technique, and forgotten legacy he remembers from the game. Ancient bloodlines, divine artifacts, mystical cultivation methods—if it exists, he's taking it.With his infinitely evolving undead legion, Carlos set out on a path to rewrite destiny and become the supreme Death Herald legend.

There are times—far too many times—when you feel that uncontrollable urge to kill someone.For Kaya, this… this was exactly that moment.“Repeat what you just said?”She’d seen hell on the battlefield—second-in-command of a military unit, dodging bullets, dragging traitors by the collar, and coming out alive with grit under her nails.But nothing, absolutely nothing, prepared her for the sight of her spineless husband flirting with her own sister. Right in front of her.“I could never marry a barbarian like you. The one I... I like is Meera—”Blah blah. The same pitiful nonsense again.You think—what could possibly be worse than this?And then, right on cue, your idiotic sister chimes in, completely serious, “I just poisoned you.”Wow.BANG.Before anyone could even react, Meera collapsed.Dead.Her so-called husband gasped like a fish dragged out of water.“Y-you…”He dropped to his knees, staring at Kaya like he was seeing a monster rise from the dark.“You killed your sister?! How could y—?”BANG.Second bullet.Same spot.He dropped like a puppet with its strings cut.Silence....Just when Kaya thought her story had finally reached its bitter end, the universe—no, god himself—decided to throw in one last, ridiculous twist.“Wife… wife, didn’t you say you were gonna eat me? Why’d you stop?”A snake beast, ridiculously charming and glowing like some immortal fantasy, clung to her, eyes gleaming.Another voice interrupted.“Shut up! My wife wants to cuddle me now—”A sparrow beastman leapt into her arms, like that made any sense.“Hic… wife, don’t you want me anymore?”A panda-like beastman sat beside her, huge, sniffly, and wronged like a child abandoned at a festival.Sitting in the middle of all this, Kaya was absolutely dumbfounded.‘When the hell did all of this even start?’