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

https://www.patreon.com/snowstar

Weapon seller in the world of magic

Mark never expected someone from his maternal side would come looking for him. As far as he knows, everyone in the Lan Sect was killed in a dungeon break about 30 years ago.

The only survivor is the Queen consort Lan Jingyi. So, where is this Lan Jing came from? And more importantly, why is he looking for Lu Zhen?

Did this Lan Jing know the relation between Lu Zhen and Lan Jingyi? Mark was racking his brains to figure out the intentions of these mysterious customers.

He wanted Allen to stop those two and interrogate but held the order in the tip of his tongue as it will lose the integrity of his weapon store.

Even the system wouldn't let him go unpunished if he were to attack his customers without the latter displaying any hostility against him or his store.

So, he let them go away without asking any questions after they happily fulfilled the end of their deal.

An army of Robots