Summoner Online: I Became the Tutorial Boss with a 999+ Villainess - Chapter 81: How to battle a third floor boss.

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.

“It was an era taken over by a single online game, the “”Second World.””

The “”Second World”” offered a vast amount of classes and skills...

Micheal, our protagonist, reincarnated back into this era and realized he had a few bugged passive skills that would put him as one of the best.

[Passive skill: Damage Reduction: When you receive damage from an enemy, the damage will be reduced accordingly to the reduction percentage. Skill lasts for 10 seconds and takes 10 seconds to cooldown.]

[Passive skill: Damage Reflect: When you receive damage, the damage will be reflected accordingly to the reflection percentage.]

[Passive skill: Damage Multiplier: When you deal damage to an enemy, the damage you dealt will be multiplied.]

[Passive skill: Sword Attack Nullifier: When you attack an enemy with a sword, the enemy will kneel in front of you and catch your blade with their bare hands.]

[Passive skill: Priest: When you suffer from damage, automatically heals yourself.]

[Passive skill…]

[Passive skill…]

.........

After reading through all his passive skills, he suddenly realized how invincible he as.

Even though he didn’t possessed a single active skill, he could still triumph over everyone else with his passive skills.

One day, when the “”Second World”” mysteriously merged with the real world, monsters and divine beings began to invade Earth…

That was when Micheal realized that his passive skills have also given him the power to kill these divine beings…”

Ji Yan discovered his wife, who hated him so much that she wished he was dead, had lost her memory after a car crash. She had changed so much it was like she was a totally different person…

When he goes to work: “Dear, don’t move, I’ll put on your shoes for you.”

When he is having a meal: “Dear, I have made all of your favourite dishes. You have worked hard, so eat up.”

When he finished work: “Dear, you have worked all day. I’ll massage your shoulders and feet.”

Ji Yan: “…”

—————-

Tang Tang got pushed into the pond by her step sister who frequently bullied her. She thought she would meet her dead mother but, who knew, when she opened her eyes again, she was in a strange place. But what made her happy was that she had a super handsome husband and a very cute son. The most important thing was that her husband was good. He was a hero who protects the country, and earns money to support her and their son. Also, he only has her as his wife, he didn’t have any concubines or whatsoever. Tang Tang decided she should be submissive to her husband, to be a good wife and a loving mother. Her nanny no longer needed to worry about her not being able to get married anymore!

- Description from Novelupdates

The Imperial Court of Tang Empire became dim and corrupt. The Emperor believed eunuchs. The officials vied with each other for authority. The Tang Empire was about to collapse. The flouring Confucianism, Buddhism and Taoism eyed it covetously. The three sects wanted to contend for the domination of the whole world. Which one would win in the end? Or would they coexist peacefully at last? Armies of different nations invaded the frontier on all sides. People and the whole world were in extreme misery. Who could save them?