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

Roughly around 10 o'clock, Shang Wen and Lan Jingyi made it to Mt. Lan.

Lan Jingyi asked him to stay at the foot of the mountain as she intended to battle against the zheng to get back her daughter, but as the second prince insisted on following her due to worry about her safety, she decided to knock him out in case of an emergency.

Amara, the giant flying stingray, the Emperor's mount, made its way to the top of the mountain.

There, they have the zheng waiting in its original form. Looking at the five-tailed scarlet leopard, the 6-circle realm flying stingray was frightened and refused to make its landing.

But then, as the zheng spoke to it in a human tongue, not wanting to see Lan Jingyi getting carried by Shang Wen if the latter was a stepson, the king-grade beast reluctantly landed on the mountain but made sure to avoid the zheng's gaze.

Lan Jingyi and Shang Wen at Mt. Lan