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

The other elders were taken aback by his sudden order and the immortal realm captain immediately followed his order without even looking at other elders.

Shang Jiao's body was freed from energy chains stepped forward as she was told.

Lan Ming then spoke, "I can sense the same bloodline running in your veins, like mine. Did you inherit Gengxin's bloodline?"

Shang Jiao cupped her fists and bowed, "Greetings, elders. I'm Shang Jiao, daughter of Shang Fu and Lan Jingyi, granddaughter of Lan Gengxin." After a brief introduction, she added, "As for your question, yes, I have inherited the bloodline of Blizzard Pegasus from our grandfather. The same goes for my elder brother."

They momentarily shifted their attention to Mark but sensed nothing. Many of them frowned collectively for a moment.

Attacking an Elder