MTL - Invincible Level Up - v9 Chapter 738 , 弑神洞

Wu Lai was an ordinary high school student. One day he was struck by a flash of lightning from a different world, and suddenly entered a fantastic world full of magic and swords. Since then, he started a totally new life. In this supernatural world, he had his ups and downs, experienced numerous battles, subdued powerful evil beasts, and fell in love with a belle. His nickname “Demon King” was remembered throughout the ages there.

Stay or return was a question. In the face of this choice, Wu Lai, with the nostalgia and gratefulness for the original world, finally chose to stay…

Here was the legend of “Demon King”…

- Description from Novelupdates

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.

16 years old-- most boys would be falling in love, as their hormones all rise to unprecedented levels. Most boys at Riley's age would have dreams; dreams that will slowly grow into passion. Riley, however, at age 16... killed the world's number 1 superhero.

The World God of Terra was devoured by the Outer God, and eldritch creatures enslaved all of humanity. Humanity was reduced to mere livestock, wearing collars with their names and barcodes, labeling them as the property of the Outer God.However, hope wasn’t entirely lost. The World Will of Terra blessed some chosen humans who rose up against the lackeys of the Outer God.Female humans became magical girls, while the males could summon mecha armors and become mecha drivers.Unfortunately, despite being a transmigrator, Linsley Sinclair hadn’t obtained a special ability or blessing from the World Will.As Linsley wallowed in depression, thinking about how messed up the world was, he was snapped back to reality by a sound.-Ding![The God Simulator has been integrated into your soul!]-Ding![It has been detected that the host’s soul has been marked by the Outer God.]-Ding![The system has successfully eradicated the Outer God’s slave mark without alerting the Outer God.]-Ding![It has been detected that the host’s mind has been polluted by the Outer God’s insanity.]-Ding![The host’s mind has been purified and the host is now immune to the Outer God’s mental pollution.][The God Simulator was created by the Will of the Infinite Realities to save this multiverse from the Outer Gods’ corruption.][The main feature of the God Simulator is to create a simulated body and let it transmigrate into another world. The simulated body will enter the simulation, creating an alternate timeline influenced by the host’s actions.][The God Simulator’s goal is for the host to become a god in every simulated world. The host must complete the normal simulation and become a god before entering the full-dive simulation.][If the host dies in the normal simulation, it won’t cause true death since it’s only a simulated body. However, if the host dies during a full-dive simulation, it results in true death.]With the God Simulator, Linsley entered the simulation. In his journey to save the world and become a god, he met beautiful goddesses.However…“You’re telling me that those beautiful goddesses in the simulation are all real?”“And now, they are coming to get me? Fuck!”