Master of Monster Synthesis - Chapter 122 - 111 I’m Really Not as Strong as You Imagine (Three in One)

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.

One day, a silver-haired goddess appeared before him.“Heaven-Defying Star. The one who goes against fate. The sole savior of a world doomed to end—”What the hell is this woman even talking about?“You must be the Regressor.”“… What?”No, I’m not.

Have you ever heard the story of the monster?

Have you ever thought that monsters have always existed, and they are lurking around you?

Have you ever thought that the reason why you are still safe is because the profession of “Monster Slayer” has existed for thousands of years?

Wang Qianchen turned into a monster when he woke up, and was ruthlessly hunted down by the monster slayers, and since then he has also entered a strange world!

- Description from novelbuddy

Luo Lan traveled to the world of pirates, but the golden finger cheated him, it seemed useless.

Fortunately, I met Luffy at the beginning, and I planned to hang out in the hat group and wait for the finale.

But what he didn’t know was that after reading his comics…

Luffy frantically racked up experience in the comics and awakened Nika form ahead of time!

Zoro had just finished his duel with Sasaki Kojiro in the morning, and he fought Kenpachi again in the afternoon!

Sanji hangs out with guys with thick eyebrows all day long, shouting about youth, passion and so on~

Usopp asked the two Wang Yue to create a shallow sword, awakening the bow and killing star!

Chopper gathered the power of the twelve beasts to prove that I am not the weakest fruit of everyone!

Robin’s thousand hands formed a seal at the same time, and told you what is the spiral pill washing the ground!

…

When the top war comes, the *hat group makes a strong debut and shocks the world! !

- Description from novelbuddy