I Can Make Everything Level UP - Chapter 762: Invisible lizardmen

What happens when you transmigrate to Beast World? With the system in hand, the world is for your taking! One day, Su Tang, an intern at the hospital, is struck by a system and transmigrates to Beast World. It’s a wondrous world with winged tigers, fire-spitting birds, and enticing man-eating flowers… Everything in this world leaves Su Tang awestruck!

After the Chief of Winged Tiger Tribe saves Su Tang, she learns how backward this place was. Su Tang is determined to help change the world! Under the system’s guidance, she helps to extract salt, build homes, dig traps, make weapons and store food for winter… And perhaps even save the world while she’s at it!

Qin Xi crossed the prehistoric times, just in time for the first robbery of the Dragon and Han Dynasty!

In this era when the great Luo Jinxian is everywhere, he doesn’t know his own footsteps, so he chooses to live in seclusion and enjoy a leisurely life.

[Ding, welcome the new member ‘Honghuang Boss’ to join the dimensional chat skirt! 】

Wanhua Tongling: “What is the big boss in Honghuang, can you eat it?”

The unreliable god of ninja: “The new boss enters the skirt, the status of the skirt is reduced by one, and the front row asks…”

A girl who is always seventeen years old: “In the world of Honghuang, the newcomer is a super boss, get ready to hug your thighs in advance.”

Honghuang boss: “Well, I’m really not a Honghuang boss! Wait, my Jade Rabbit just caught a wild dragon girl and went into hiding for the time being.”

- Description from novelbuddy

Yang Lujia, a sought-after, handsome, sports-driven, and seemingly perfect man with an outstanding family background was killed in a plane bombing orchestrated by his so-called pals. Before he even knew it, his soul traveled through space, and his supposed-to-be ending unexpectedly took turns.

Unknowingly, he set foot into a world made up of five realms where strength matters most. Then, one day, following a mission, he started accepting disciples.

[Ding! The system has discovered an S-Class Genius! System’s Fifth Ability Unlocked: Disciple Acknowledgment!]

[New Mission: Recruit and acknowledge the Holy Flood Empire's S-Class Genius. The reward will be issued upon acknowledgment from both parties.]

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.