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.
***
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.
**************
Author's current works: War Online, My Soul Card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
**************
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

Description: Planet Earth-486 is infested with demons. Help the inhabitants of the world and exterminate the demons as many as you can until they hail the host as a hero

Description: Planet Earth-486 is filled with Mithril mines. The host must use this opportunity to extract as much as he can.

Reward: 1000 gold coins for every kg of Mithril the system can extract from the ores the host has excavated up from this planet.

Description: The royal elves, the celestial elf race, of this world have been imprisoned at the tower of Xalazar.

Reward: Tactical UAV or Armed UAV (choose one)

The Unveiling: Earth-486's Quests Await