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

*Ding! Divine Aura passive skill is activated. All of your stats are increased by 2 points.

He then took out a vial of green liquid from the inventory and gulped it in one go.

*Ding! You consumed the peak strength potion. All of your base stats increased to 9.9. Your ether points increased to 9,999,999,999.

With three holographic screens floating in front of his eyes, Mark waited in patience.

His wait only lasted for fifteen seconds before a blurring figure reached there and stopped before slowly descending onto the ground.

Affiliation: Church of Doom, Nine Hells sect (former), Gorganal Empire (former), Netherworld (former)

Mark fights the Church of Doom's founder