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

Mark didn't respond to his sister-in-law and spoke without a hint of expression, "Sylvandria, I give you 30 seconds. Dress up as fast as you can. After that, I will take you to the altar in whatever state you are in."

"30 seconds? Why?" Zan Rong raised her voice once again. However, Sylvandria calmed her emotions and replied, "Fine, just wait outside."

"Be quick…" Mark urged her one more time and went outside.

Steve was dumbfounded by his dad's actions. He just stood there in a daze without knowing how to react as he saw everything about his dad was different from what he remembered.

Fortunately, this awkward silence between him and his dad didn't last long as the High Priestess exited the room in her bridal wear, once worn by the past Elven Queen.

Mark then walked to the High Priestess and shocked everyone once again by suddenly lifting her and carrying her in his arms.

Sylvandria's ultimate technique and Mark's reversal