A Record of Ash & Ruin: The Grieving Lands - Chapter 6Book 3: : Cultural Exchange

Betrayed by those he empowered. Slain at the peak of his reign. Reborn into a world unworthy of him.Tian Mo was once a supreme cultivator, a dark sovereign who ruled with absolute might and terrifying intellect. After a million years of conquest, his closest allies turned on him, stripping him of everything. But fate offered no rest. Reincarnated into modern-day Earth, he awakens in a weak mortal body—yet his memories, ambition, and ruthlessness remain untouched.In this strange new world of technology and fragile peace, Tian Mo finds new prey. With the Primordial Chaos Demonic Evil Physique and the forbidden Divine Sins Emperor Technique, he begins building his empire from the shadows. He manipulates the system, devours the corrupt, and topples the powerful—not out of justice, but vengeance... and the endless hunger for power.There are no heroes in this tale. Only a monster reborn—and the world that will burn beneath his feet.

Roan crossed over and became an FBI agent.

Several years later, when interviewing the world-renowned detective Roan Greenwood, the reporter asked:

“Excuse me, what made you persevere on the road of solving the case?”

Roan tilted his head and glanced at the sports car beside him, the villa behind him, and the beauties in the villa, and smiled slightly:

“Of course it’s the bonus after solving the case.”

“???”

- Description from novelbuddy

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.

What if one could defy death and, instead of perishing, be reborn?

Such a situation happened to Kieran Silver after succumbing to his circumstances caused by wicked superiors.

After being reborn, Kieran's desires changed and he considered the many routes.

The route that resonated with him most was Zenith Online, the MMORPG that changed his life initially.

In his past life, he was a bare minimum kind of guy, using the least at its maximum potential. However, his current outlook changed.

Accomplishing the bare minimum? No, he would go above and beyond!

On his path to greatness, creating an immortal legacy that resounds throughout the universe, dethroning his former guild, and other grand feats will become his stepping stones.

To ensure his aspirations become reality, Kieran must walk a path where he becomes an entity prime for destruction.

Magic, destruction, and ancient practices are just a few of the factors that mold his ultimate power. What began as one of the Hidden Classes would ultimately evolve into a one-of-a-kind entity!

The ultimate power isn't given or born, it is manifested.