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

*Ding! You triggered an emergency quest, Save everyone from mind control

Quest: Save everyone from mind control

Description: Mage Vexiron released his possession of Queen Elowen after she was trapped in his cursed diamond. However, her mind was still being controlled by the effects of the curse. Zan Rong and everyone who was captured by the diamond was also forced to become a part of the storyline created by Vexiron. Remove the influence of the curse from their mind by applying purification stones on each of them or completing the storyline.

"Eh? Mind control? That means all these people weren't illusions but real? No wonder the system said that I could use all of its functions," Mark's face turned pale as certain memories popped up in his mind. "So, I have been fuc*ing this blonde for real, all this time? And I almost raped the princess?"

The third official fiancee