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

Wang Chin collapsed onto the ground without being able to resist the gravitational pressure within the gravity dome that covered the entire area with a 1-kilometer radius from the caster, i.e. Mark.

As for the others, they were still in shock to see the death of their patriarch, although not clear how he died. They assumed that Lan Ju did it and now, they were forced to lie on the ground.

"Argh…" Wang Chin let out a scream as he struggled to move. Since Mark had gone with the maximum amount of gravity, even Lan Ju is barely resisting the pressure. For someone like Wang Chin who doesn't have a great physique, it was hell.

Mark wasn't done with his attack. He proceeded to summon the lightning clone while slowly walking toward the enemy.

As the lightning clone appeared beside him, Mark passed an order, "clone, you rip off his arms before he tries anything funny. And Lan Ju… just cut off his head and get rid of him."

End of Wuji sect