Snowstar

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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Author's current works: War Online, My Soul Card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
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You can also support the Author through Patreon or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

Genesis Weapon store, Imperial City;

At the first-floor residence, Mark was still on his bed, sleeping peacefully while everyone else in the city already woke up and started going to their work.

Meanwhile, the store was already opened and Allen was managing it. Song Yue's work starts at 9 and Mark insisted that she doesn't have to work early in the morning.

Feeling a little bit of pity for Allen, despite knowing that he is only a robot, Song Yue accompanied him downstairs, just sitting there in a corner and reading the newspaper.

Her father aka the Black Knight hasn't arrived yet as he was also strictly told only to report to the duty at 9. The arrangement was done in such a way so that Song Yue feels like the Black Knight was a hired person.

Anyway, back to Mark, while he was sleeping soundly, the system was refining the ether energy in the background.

Breaking through to Rank-6 (Upper Elite realm/6-circle)