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.
***
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.
**************
Author's current works: War Online, My Soul card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
**************
You can also support the Author through Patreon

https://www.patreon.com/snowstar

Weapon seller in the world of magic

It is almost noon. In the Lin Mansion's training ground, Lin Xue and Allen are sparring like usual.

Compared to a few days ago, the heiress of the Lin Clan is doing extremely well as she progressed in raising the number of ether particles and entered the 4-circle realm. It was indeed a feat to achieve such a thing without taking help from external assistance. Yao Ling felt that had she absorbed the energy from spirit/ether crystals, she would have long entered the 5-circle realm by now.

While she has yet to land a strike on Allen, she was no longer the same person she was, two weeks ago, who got toyed by the Android. Several times, she managed to push back Allen. And with the help of the lightning attribute, her speed also considerably increased to match Allen's speed.

But, Mark was indifferent to her progress as his attention lies elsewhere. He was currently absorbing the luck of a maid with more than seven points of luck.

Peak strength potion