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

"Hateful moooortallll…" roared the Undead King as its core behind the strong ribcage was destroyed with an ice arrow.

Followed by the disappearance of the undead, Mark dropped to his knees as his vision blurred. He took heavy breaths with sweat covering his entire body.

"It's just a fuc*ing 9-circle one and yet, so exhausting… cough cough"

From the start of the trial, Mark has been fighting against the swarm of the undead for almost 6 hours straight before he finally faces off with the undead king who is virtually immortal without the destruction of its core.

The trial of Yuanlong (part-1)