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

After killing two Orthus beasts, Mark shifted to the front chamber and started to drive straight.

He planned to go on a rampage by throwing all the grenades around, making his way towards the dungeon overlord.

Little did he expect, his actions of killing two of the guardian protectors enraged Cerberus so much that it transformed back into the original form and the beasts started to go on a rampage like they were supposed to...

After swatting away the second prince, the dungeon overlord turned its sight on the incoming battle tank.

"Damn, it is coming towards me. I thought it wouldn't pay attention to me until I strike it." Mark was panicked a little bit but then, he realized that the beast is just making his job easier.

"Open inventory."

Mark took out the Peak strength potion from the inventory.

Dungeon break (part-6)