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

With no way out of the divine prison and not being able to bear the pain instilled by the needles brimmed with divine energy, the demon emperor Eol was forced to ignite all of his cells and went with a suicidal attack.

His body exploded and released powerful demonic energy that could only heavily crack the barrier due to the sheer dominance of divine energy over an evil attribute like demonic energy.

Seeing that there was nothing but blood spilled inside the barrier, she dismissed her technique and let out a smile of satisfaction, "Okay, my job is done here. I hope whatever you are planning will turn successful too, Mr. Lu." She mumbled to herself, rekindling her hopes on the human as she realized that everything he had done so far was a giant ploy to defeat the enemies.

Little did she know that this timely ending of her battle would indirectly affect Mark's choice.

The return of Vexiron