Cold-blooded Undercover Master - Volume 1 Chapter 1180 Subduing Phantom Beasts

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

The war in the kingdom intensified, and the orcs from the North were ready to take action. They traveled through time and became the ninth son of an earl. He was not qualified to inherit the title, but accidentally obtained the daily intelligence system. With the help of the daily intelligence system, he began to build a territory and obtain the title.

[Daily information has been updated]

[1: Renn was wandering around the Lucerne town market today and accidentally bought a life fruit from Mijie’s pulp shop. After taking it, he officially condensed the life seeds]

[2: In the northern part of your territory, there is an extremely rich iron mine among the Golimbo tribe]

[3: In ten days, your territory will be attacked by tauren]

[4. After seven days, there will be a group of unicorns looking for food in the west of your territory]

【5：…………】

[6: Engel Dressrosa seems to have some troubles, coming from the limitations of his own strength]

【7:……】

- 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.

Cheng Yan transmigrated only to end up in a medieval Europe like world, becoming Roland, a Royal Prince. But this world doesn’t seem to be the same as his former world, despite some similarities. Witches are real and they actually can use magic?

Follow Roland’s battle for the throne against his siblings. Will he be able to win, even though the king already declared him to be a hopeless case and with the worst starting situation? With his knowledge of modern technologies and the help of the witches, who are known as devils’ servants and are hunted by the the Holy Church, he might have a fighting chance.

Now, let his journey begin.