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

Xie Tianyu was unaffected by the chilly wind that hit his face but what surprised him was the transformation of Shang Jiao.

"The Blizzard Pegasus…" he mumbled, staring at the beast.

Shang Jiao, in her beast form, spoke, "Why are you so surprised? Haven't you done your research before attacking our factory? I'm Lu Zhen's younger sister, the princess of the three kingdoms, Shang Jiao." She proudly announced.

Xie Tianyu replied with a comment, "You aren't just that."

"I don't like to boast about the fact that I'm the youngest demigod in the history of this world. It's a bit too crass…" said the princess. In the icy pegasus form, she raised her upper body and flapped her wings, releasing gusts of chilly winds once again.

This time, they were quite powerful.

Blades of condensed energy traveled along with the winds as they struck their enemy.

Mark's unexpected reunion