The Wrong Way to Use Healing Magic - Chapter 56Vol 17.

Betrayed by his own werewolf clan and left to die in a forbidden vampire crypt, Lucien Drake awakens something ancient—something monstrous.His blood ignites the Crimson System, binding him to a long-lost vampire bloodline rumored to be more powerful than the vampire lords and deadlier than any alpha.Now reborn as a hybrid of vampire and werewolf, Lucien gains powers no being should wield. The System whispers, hungers, and rewards him for one thing: domination—of bloodlines, enemies, and women.With every kill, he evolves. With every seduction, his power multiplies. And with every conquest, the world bends closer to its knees.But ancient forces stir. Vampire princesses, werewolf queens, and dark priestesses all want him… dead, bound, or in their bed.In a world where the strong rule by blood, Lucien is rewriting the laws of nature—and he'll either claim the throne of night...Or drown the world in crimson fire.> “You think I'm a monster? You haven't even seen what I become when I climax with your queen.”

Survival is easy. Life is very difficult. My family wants not to live in humility, but to live a proud and glorious life. My family, will not be slaves!

- Description from Novelupdates

The Immortal Path led to Longevity and Sovereign was heading in ease. When the Longevity was no longer in ease, all living beings were just prisoners. Conspiracy, internal strife, and the invasion of the others, all of it emerged together.

In such a world, there was such a young man. He made his way upstream, stepping on blood, defying the emperor, destroying the various kings, and slaughtering his way through the hundred clans to form an Immortal Path towards the throne of Sovereign! The Immortal Path was endless, while the Sovereign was limited. He used his blood to forge his immortal legend.

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.