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

https://www.patreon.com/snowstar

Weapon seller in the world of magic

Affiliation: The Eastern Sun Kingdom, Ixitus Empire, Eurasian Federation;

Description: Marina Zan, a native to Earth-192, was one of the summoned heroes of the Ixitus Empire and went by the name Lyra Erxidor. Due to some reason, she has lost her memory. She's currently living as an adopted sister of Ouyang Zen, the King of Eastern Sun.

*Ding! You triggered a hidden quest, Awaken the memories of Zan Rong.

"She's Mari, the one I was familiar with? The fact that she's affiliated with Eurasian Federation clearly shows that she didn't just have an identical name and appearance.

Expo 1783 (part-8)