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

Two days later at Sylvandrial Dominion;

In a village hidden deep inside the largest forest of Earth-486, almost all elves above 15 regardless of their skin color, gender, and bloodline were seen in armor as they roamed around.

Created by Sylvandria, the former high priestess of the Empire, this place is currently the only location on the planet with an elven population that is not corrupted.

Zan Rong was greeting everyone on the way as she was carrying a basket full of veggies and fruits. She made it to one of the nicely-built treehouses and entered the living room only to see two teenagers arguing with each other about a move in the game of chess they were playing.

"Stop it, you two," shouted the woman as she walked toward them. After gaining their attention, she went on scolding them, "People could hear you two even from the ground. Behave your status, will ya? You are supreme beings for god sake."

Forgotten Memories and a Deity's Secret Scheme