New Age Of Summoners - Chapter 50: System Emergency assistance

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.

In the past, the giants of the heavens and the gods were destroyed after the reincarnation of the world! Cruel curse, eternal hatred, Tan Yun is determined to never sink again! For the sake of loved ones and relatives, from now on, step on the corpse of the enemy step by step to surpass the peak! Defying the sky, killing all worlds, I am the only one!

- Description from novelbuddy

“Sex, Hot Sex, and More Hot, Unstoppable Sex! They want to ride me, squirt and make me punish them. That’s all these high-powered women in Tokyo crave. And who am I to say no when they offer it all to me with a cash reward attached to it?”Yuki Mori is a broke, 21-year-old college student on the brink of finishing his tech degree. Struggling to make ends meet, he stumbles across a high-paying job offer with flexible hours—“Private Servicing Assistant Needed.” Expecting nothing more than cleaning for a high-end fashion store, Yuki is thrilled when he lands the gig.But he couldn’t be more wrong.When Yuki meets Katashi Kurica, the stunning, 32-year-old CEO of Kurica Fashion House, he quickly learns that this isn’t just a job. Katashi is a powerful, seductive woman who doesn’t take no for an answer—and what she wants is him.Nervously, Yuki signs the contract, but it’s only when she calls him to her penthouse that the truth is revealed. “You’ll be servicing me. Not the floors.”For Yuki, a virgin with no experience in the ways of the world, the offer is shocking. But the pay is too good to refuse, and soon he finds himself caught in a web of desire, where his body becomes the price for her pleasure.As their encounters grow hotter, more intense, and undeniably addictive, Yuki discovers that this job is more than just an arrangement—it’s a journey into a world of seduction and erotic temptation. And Katashi isn’t the only one who has her eye on him. In a city where desire knows no bounds, Yuki’s life is about to change forever as he finds himself in the arms of many hottest, and most seductive MILFs of Tokyo.

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.