Terminally-Ill Genius Dark Knight - Chapter 181

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.

“Reincarnated into the World of Magic as a demon, the last thing Davis expected was to grow up right amidst the arms of angels. Ever since the group of philanthropic angels took pity on his miserable birth and adopted him, Davis has been forced to keep his evil identity a secret while he signed in to the system.

“”Ding! The Host has signed in at Angel’s Pond, ‘The Saint’s Halo’ is rewarded!””

“”Ding! Devil’s blood activated. Sign in error. ‘The Devil’s Curse’ is additionally rewarded!””

“”Ding! The Host has signed in at God’s Throne, ‘Gold’s Holy Axe’ is rewarded!””

“”Ding! Devil’s blood activated. Sign in error. ‘The Devil’s Manifistation’ is additionally rewarded!””

After a thousand years of quietly signing into places in the City of Angels and being rewarded with double the rewards, Davis’s true identity finally came to light! Now as a true Devil, Davis had both the world of angels and demons surrendering at his feet!”

A black pearl brought Jiang Feng from a doomsday stage where top masters with one emperor, two emperors, three emperors, four deities, and seven peerless cities show off their glory to parallel time and space, and this time and space-the end of the world has not yet opened! !! Under the sky, the youth look up, if I have strength, can I get through … these two time and space! !!

- Description from 69shu

Take over a《Homeworld》Mothership and then travel to the world of《Star Wars》？Tang Xiao: “ This world is so dangerous, Mom, I'm going home. ”Wait a minute, the Mothership database actually has various science fiction game technologies, 《 Sins of a Solar Empire 》, 《 Halo 》, 《 EVE 》, 《 Starcraft 》, 《 Stellaris 》 ？？And there are still Jim Raynor, Master Chief, and Archbishop Artanis sleeping in the freezer?Tang Xiao: “Humph! They will all bow down at my feet!!”The Fourth Calamity… ah no, long live the Fourth Empire!Official TranslationThis is the Official Translation of “The Empire Begins With The Fourth Scourge” by Author 镜大人 also known as Kagami. This Translation has the Author's full endorsement and is supported on WebNovel (and now Space Battles Forurms). The Chinese version by Kagami is linked below!