MTL - The Alternate World Is Too Dangerous: I Hide In Reality And Rule! - Chapter 243 sword heart collapse

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

After reincarnating eight times unsuccessfully due to a glitch in the netherworld, Jia Hao finally reincarnated in the world of Urban Fantasy, an eroge game that he played before. However, he realized the game was currently in the bad ending mode and he is powerless like a side character without any game system.

Skinny dude who blackmails girls? Check!

Fat Ugly Uncle who lusts after women? Check!

Blonde haired delinquent whose eyes are covered with bangs? Check!

As Jia Hao was wrecking his brain to how to change the plot, he found a mysterious pot that can take him into an ancient world, and the items he brought from the modern world transformed into heavenly treasures!

“Now, you dare to gaze at my women? My dear wives! Beat him to death!” Jia Hao ordered as he leaned back on the chair like a salted fish.

Under the vast immortal sky, the brilliance of an era is nothing but fireworks blooming at the fingertips.

Overlooking the earth, for thousands of years, life and death, where are they all? The Immortal Gate, the Dynasty, and the Supreme Holy Land are all just a handful of loess under the Immortal Vault.

A thousand years of splendor, and a smash into ashes.

Cinders sprout in the depths of the ruins, and you and I strive to be the trees that reach the sky.

What the hell is on the other side of the Immortal Firmament?

- Description from novelbuddy