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

Ten minutes later;

A giant blue-colored fireball was coming toward Mark, who controlled his blizzard wings to block them. The fireball struck the icy wings and disappeared.

The five-tailed scarlet leopard disappeared and reappeared behind Mark in an instant before opening its mouth widely.

It was about to attack him with a Hydro Blast but the lightning not only intervened in perfect time but also threw a punch right at its chin.

The scarlet leopard blasted away for a dozen meters and crashed onto the group with blood trickling down its mouth.

Meanwhile, Mark turned around while conjuring an ice spear. He looked at the leopard, which is slowly rising to its feet, "So, will you finally agree that I'm stronger than you and admit defeat?"

Pushing away the dust from its body, the leopard replied, "I have yet to use my lethal skills, Lu Zhen. Since this is just a spar, I'm not being too serious."

The zheng submits to Mark's authority