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

Vienna City, Genesis Federation;

In one of the rooms of the royal mansion, Xie Tianyu, with his limbs intact and looking as good as ever, was seen lying on the bed.

He slowly opened his eyes to see a white ceiling and felt a comfy bed below the bottom.

Letting out a groan, as he got up and turned his head to the side, his eyes fell upon Mark, who seemed to be asleep while sitting but just opened his eyes at the same time because of the groan.

Xie Tianyu felt that his powers were suppressed by some kind of seal, feeling as mortal as ever. He was resigned to fate, but just then, Mark rushed at him and grabbed his face, "Allen, you alright, bro?"

Xie Tianyu's eyes widened, and confusion fell over all over his face. As Mark realized it and backed off a bit, the immortal realm warrior spoke, "I just remembered that before I fainted, you called my name. Do we know each other?"

Lu Shan enters 4-circle realm