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

"Yao Ling? What the hell happened to you?" Lin Xue was surprised to see the bloodied figure of her loyal bodyguard. Without wasting any moment, she took out a recovery potion from her storage ring and fed the guy.

As his injuries were healed in a jiffy, Yao Ling once again urged her to escape from the forest, "You are in grave danger. The boss of the gang is far stronger than me. He isn't someone we can face head-on. We need to leave, right away."

Lin Xue's face stiffened at his words. She couldn't help but remember the words of the assassin who warned her that she will only leave the forest as a corpse.

Luckily for her, the culprit has already been apprehended and she completed the quest. So, there's no reason left for her to stay here and risk her life.

She turned her head to look at the android, who was looking at her and Yao Ling, "Allen, pick up the target. We are leaving right away."

Lin Xue and Allen's first quest (part-6)