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

The next day morning, Mark and his companions resumed their journey. Unlike what they expected, there was no sort of ambush happened from the Wuji sect despite its patriarch making an announcement.

Eventually, the group crossed the border and entered the Leon Empire. Because of the crest on the horse carriages, no one stopped them including the soldiers at the border check post.

The appearances of the griffin and the giant albatross made it only more difficult for anyone to question them either. Of course, the news of their appearance will reach the imperial palace very soon.

Just like that, two more days passed away.

Somewhere in the wilderness of Leon Empire;

The two bicorn carriages were striding side by side in a vast desert with a giant albatross and a Griffin following them from above.

While the albatross was alone and didn't have any rider, the Griffin, on the other hand, was accompanied by a 15-year-old girl.

Mark's proposal to the Kunlun sect