DxD: Scion of Lucifuge - Chapter 349: Lisa’s Unsolved Mystery—Lumine’s Compromise

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.

[When you cast a spell 1000 times, the damage of all skills will be permanently increased by +10000. At this time, your fireball spell is equivalent to TNT. 】

[You cast spells 300,000 times, permanently increasing the skill damage to +3 million. At this time, your fireball technique is equivalent to an atomic bomb explosion. 】

[You cast spells 80 million times, permanently increasing your skill damage by +800 million. At this time, your fireball technique is equivalent to a supernova explosion! 】

A global catastrophe is coming,

Lu Cheng returned from the apocalypse and returned to the first day of the disaster to unlock super god-level talents!

Endless Drain: Each time you cast a spell, the damage of all skills will be permanently increased by 10 points!

So, Lu Cheng silently stacked the layers and became invincible before he knew it.

The national war has begun and is besieged by the enemy’s coalition forces? It doesn’t exist. Do you understand the fireball deterrent?

A world-class BOSS with hundreds of millions of health points? I was hit by a fireball, what can I do?

God-level civilization invades and easily blows up the sun? My fireball technique is like the sun!

Until the gods joined forces to blockade and trapped Lu Cheng in the Forbidden Fire God Realm.

Lu Chengcai showed off the other 100 skills: “Who told you that I only know the fireball technique?”

- Description from novelbuddy

Hybern is defeated, but peace is not yet near. An ancient prophecy foretells the fusion of two souls. Nova, daughter of Feyre and Rhysand of the Night Court is to be joined with Hollis, son of Kallias and Viviane of the Winter Court. Without this union, it has been said death will claim the Fae lands, and in its destruction, all the Courts will fall.

You shall become king—

Ruling over all “serpents” in the world…

Become the man who bears the brunt of dragonkind’s fear and hatred.

A modern era when humanity is threatened by attacks from giant dragons flying from beyond the sky.

Controlling “leviathans”—serpentine spiritual beings created through magic—humanity is locked in a protracted war of resistance against the dragons.

Fortunately, there exist witches known as “magi”—battle maidens of salvation who formed covenants with “serpents” in order to combat dragons.

Nicknamed Hal, the young man called Haruga Haruomi makes his living through facilitating the covenants of these girls.

At the (partially coercive) request of his childhood friend Asya, one of Europe’s top witches, Hal returns to Tokyo New Town after an absence of three years.

Accompanied by the beautiful Asya whose appearance rivaled a fairy’s, Hal is running all over the place to secure his base of operations and taking care of matters related to school transfer when the elite dragon Soth suddenly attacks—!?

Life has been breathed into a brand new myth between dragons and dragonslayers.

A grand opening to the “birth” of a top-class battle epic!