Supreme Harem God System - Chapter 1402 The Rules.

Once through the pirates, Lu En became the son of Monkey d Dragon, a grandfather named Monkey d Karp, and an unreliable and neurotic younger brother named Luffy.

Fortunately, the ghost back system is activated!

The completion of the ghost back is 10%, and the training effect is increased by 100 times!

The completion of the ghost back is 20%, and the training effect is increased by 1000 times!

…

One day, Lu En, a ghost-backed master, appeared in front of Luffy who was shouting to go to sea, and made Luffy cry on the spot.

Luffy: “The pirates in the sea are all monsters like my brother? I don’t want to go out to sea!”

Garp: “For a long time, the two boys, Long and Luffy, with small arms and calves, I really doubt that they are not my sons and grandsons. Like Lu En, they are the grandsons of the old man!”

Warring States: “The strongest creature in the sea, land and air is Kaido? No, it’s Lu En!”

- Description from novelbuddy

Strength: 1Agility: 1Stamina: 1Magic Power: 20Luck: 1All my stats are dumped into Magic Power.I can only use one spell.There’s no character as broken as this, and yet, that’s me.And somehow, I got mistaken for a once-in-a-lifetime genius.

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.

Travel through the world of pirates and get the red police explosion system, with tens of billions of explosive troops, subvert the world!

He is known as the worst criminal in history. In order to kill the admiral, he sent millions of soldiers. He is known as the world’s worst criminal!

His mind-controlling device can transform the navy: “Five old stars, take a look, in the navy, which one of us has more people?”

His self-explosive soldiers frightened cp0, and his radiation soldiers made the four emperors retreat.

His super-time air soldiers made Tianlong people sleepless, and his super weapons and bullets made the general escape from danger…

“I’m here to give you an ultimatum! You’ve been surrounded by me!” On top of the war, Ren stood alone on the top floor of the Navy Headquarters, watching the two sides fighting and said calmly.

At the same time, a channel was opened behind him, hundreds of millions of mobilized soldiers, magnetic blast infantry, biochemical soldiers, self-explosive soldiers, pilots… tens of millions of prismatic tanks, aircraft cannons, and even super weapons, yes For the superhumans present!

“Wuluoxing, how many teachers do you have?”

(explosive flow)

- Description from novelbuddy