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

A few hours later;

Leaving the rest of them at the hotel, Mark and his two sons left for the Auction House. Qing Jie tagged along with them as they traveled in LMV, instead of taking a traditional horse carriage.

Mark wanted attention from everyone. He wanted rumors to spread like wildfire. While his name wasn't spread around, LMV's unique appearance indeed did the job for him.

After an hour of travel, they reached a coliseum-type structure and stepped out when stopped by the guards at one of the entrances that led to the VIP area.

The guards didn't recognize Mark or Qing Jie but the latter's special invitation badge helped them to get through it without any issues.

From there, they walked on foot, although purposely done to showcase the two teenage supreme beings walking behind Mark like subordinates.

The Grand Auction (part-1)