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

30 minutes later, Emperor Shang Fu ordered the withdrawal of troops.

60 minutes later, the demon king made a visit to Mark and handed over the divine-grade weapon, the Bo staff, as he cannot take it with him to his world.

"This weapon…" Mark frowned as he read the details.

It turned out to be Ruyi Jingu Bang, the weapon of Sun Wukong from the legends. However, it was slightly a disappointment for Mark as a weapon with such legendary status is nothing but a low-quality divine-grade item (Mythril grade).

Mark kept it in his inventory as he has yet to decide what to do with it. The system recommended it for Allen but as he already had a better divine-grade weapon, Mark felt like it doesn't make any sense to hand it to him.

At the same time, he couldn't extract raw materials through weapon transmutation or dismantle them through Devil Hand because of the availability of upgrades.

Mark demands the emergency assembly