Rise Online: Return of the Legendary Player - Chapter 27 The Lost Links

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.

What would you do if your entire world were turned on its head? A Primordial System buzzing in everyone’s heads, displaying strange screens and other displays in their visions. Being thrown into a tutorial before entering your first System Event broadcast across the universe. Returning back to your home after the System Event to realize that it’s been filled with Gates leading to monster-filled domains, a good number of which have already broken and released their monsters into the world. And learning that the abilities every human being has – abilities that have led to the current structure of society – are nothing but the root of their Skill Trees. The very first skill in their Skill Tree out of many. Well, Ashley doesn’t know. She doesn’t remember anything other than some basic common knowledge from before waking up at the start of the tutorial with amnesia. So why should this change anything for her? Other than her finding out about the blood bestowed upon her by a certain primordial and her own Skill Tree. One with just a single skill. A skill to unlock the skill trees of those she kills. To assimilate. What to expect: Skill Trees, LitRPG Apocalypse, Skill Tree Assimilator(the ability to take the skill trees of those the MC kills that she can unlock through Skill Points without getting the skills right away), Livestreamed Dungeons, Livestreamed Public Battles and Events, Chaos Magic, Varied Magic due to Skill Tree Assimilator, and the MC does not start off strong in the start and only grows strong as she assimilates more skills from those she kills, the MC starts out without any memories and few emotions and slowly gains them throughout the series. What not to expect: I do not write romance(for the main protagonist), there will be no harem, there will be no reverse harem, and do not expect a really strong MC at the start of the story as she has to grow into that role.

Chen Xiaoyun, an orphan from Guangzhou, China, once met a girl who looked remarkably like him. Before he could learn more about her, a deadly virus was unleashed around the globe.Humans turned into creatures straight out of video games and movies, and zombies and mutants roamed the streets with no one to stop them.From tanks to jockeys to even invisible zombies and mutated dogs. The mutations are just endless.“Why is there a zombie apocalypse just as I find my family? And why can I suddenly create things from thin air?”Will Xiaoyun survive the chaos with the new people he meets along the way? Will he use his newfound abilities to bring peace to a devastated world?Or perhaps he will just take another nap in the bed like a lazy pig——“Shut up. How am I supposed to do anything when you keep throwing women at me?”

Every time he dies, Ethan Hill gains a little more power.Earth was chosen for Integration, but Ethan knows from the second his Trial begins that the Integration is a lie. These creatures giving Earth the 'honor' of access to their Interface want something from Earth - he just doesn't know what.Now he's trapped on an alien planet and lost in a time loop, fighting for strength and for his own humanity.One thing's for sure: He'll die as many times as it takes to tear it all down.