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

Soon enough, they enter the giant portal without any problems on the way.

But once they did, they re-entered the Plane of Ice and Fire, although this time, they teleported to a frozen planet with towering snow-capped mountains stretched like alabaster spires into a pale, star-lit sky. Endless plains of glistening snow shimmered under the auroras, painting the landscape in hues of green and blue.

Crystal-clear ice caverns sparkled like diamond cathedrals while frost-laden forests of ancient, gnarled trees stood silent against howling winds. Amid this frozen splendor, every flake of snow and every gust of frosty air contained dense natural energy, unlike anything Mark experienced so far.

*Ding! Scanning the planet's atmosphere.

*Ding! Oxygen levels: 38.6%, Nitrogen: 58.2%, CO2: 2.1%, Argon and water vapor (remaining).

*Ding! Atmospheric pressure: 7.3 bar

*Ding! Current temperature: -152 degrees Centigrade.

Returning to the ancestral land