Koko wa Ore ni Makasete Saki ni Ike to Itte kara 10 Nen ga Tattara Densetsu ni Natteita - Chapter 281 - – Thrall and Human

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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At the genesis of the world, the ‘Dark God Entropy’ was defeated in the fight between the five other Gods, and was sealed.

There are gods in the sky, there are people on the earth, and there are no immortals in the world.

Three thousand years ago, the gods descended.

The cataclysm of the world, the aura weakens, and the immortals disappear;

One hundred and fifty years ago, the gods descended.

The rich Chipa Plateau and the invincible Panlong Ancient City have all been turned into loess;

After another hundred years, I, descended…

But the starting point to unravel all the mysteries, and even the key to survival in troubled times, starts with being a good dude;

Start from learning to hide the front and defend the clumsiness;

Start with an adventure;

Starting from reversing the established fate;

Most importantly, start by entering the dreamland of the gods.

- Description from novelbuddy

Yuder was a commoner Omega who rose to the top with his ability.

When he woke up again after being falsely accused and executed, he was back 11 years ago before everything began.

A chance to get back……

He must not repeat the same mistake he did before.

To survive, and to save the world, now he had to save the man he had killed!