Arifureta Shokugyou de Sekai Saikyou (WN) - Volume 2 Chapter 5

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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The youngest princess of the country of Stellaus, Marietta, was betrothed in a political marriage to the General of the great militant country, Oltaire. General Belvant was often said to be strong, a fierce and terrifying god of a warrior. On the other hand, Marietta was a delicate flower of a princess. Everyone felt pity for poor Marietta’s situation, however, the truth was that Marietta found the General very dreamy… The story of a 30-year old General with a scary face (who was actually quite nice), and the tiny and adorable 18-year old Princess in their times of conflict and of lovey-doveyness.

Once I’ve become Immortal, then my attempt to conquer the world shall begin.

I, Zhong Shan, in order establish a supreme heavenly dynasty, must marshal all the luck that I can gather to cleanse my own karma. Then I will have the strength to fight heaven itself, create a new world, and live forever.

First: Fate

Second: Luck

Third: Feng Shui

Four: Cultivate Inner Virtue.

Five: Fame

To gain eternal life.

To obtain fame, one must establish a heavenly dynasty and amass the luck of the world!

To cultivate inner virtue, one must establish holy sites and accumulate an immeasurable amount of merit!

To cultivate Feng Shui one must learn to communicate between yin and yang and control the powers of heaven and earth!

To cultivate luck! To cultivate fate!

Ask the whole world, who can have eternal life!

- Description from Novelupdates

The real world merged with the game world, monsters came to the world, and herds of beasts raged in the city.

In order to eliminate monsters in the dungeon, everyone who has player qualifications has to hunt monsters, choose a career, keep getting stronger, and protect human cities from being destroyed.

Elemental mage, fire and ice, destroy everything! In the priesthood shield battle, Mount Tai collapsed in front of him and remained unchanged.

However, Han Yu, who had high hopes, chose the summoner profession that even dogs would not choose.

“Summoner? Is there anyone for this profession? Don’t dogs even play?”

“Who will team up with a summoner, let him brush slowly by himself. The two summoned creatures are not enough for me to step on.”

“I heard that his talent is not bad, why can’t he think about it so much, and changed his job to a summoner.”

Until one day, Han Yu was drinking tea while standing behind Huyun Leopard, which was the size of a mountain, and the giant skeleton hand that emerged from the ground gently pinched the boss to death.

Only then did people discover that Han Yu’s summoned objects would not disappear, and could even be cultivated continuously!

- Description from novelbuddy