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

While Lin Xue's mind is a complete mess from what she heard from this mysterious old man, the two androids were alerted. They quickly went into battle stance and took out their respective weapons after scanning the enemy.

This fellow before them appeared to be an exalt realm expert (7-circle) at peak stage but his age was over 1500 despite the fact that he is a human.

The fact that he could see through them indicates two possibilities. Either this fellow who came back from the dead is once a supreme realm expert who had his cultivation dropped later on or he had special eyes that can see the souls.

Either way, they didn't take this man lightly and decided to kill him.

However, never in the world did either of them expect the doom scythe suddenly escapes Alina's grip on its own and flew toward the man.

Mark's demands for the peace