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

*Ding! You selected Anti-matter Warhead.

*Ding! Please type the yield you desired in grams.

"Hmm, let's go with the base…" Mark wrote 1, which should be equivalent to that of a 21.5 KT yield, enough to take out average demigods with ease.

But, the demanded price is far higher than an equivalent yield from a nuclear warhead.

A nuclear warhead of such magnitude costs about 10,000 gold coins but the anti-matter warhead is 10 times higher. It is around 100,000 gold coins per warhead that only has 1 gm of antimatter.

For 1 kg of antimatter warhead, the price spiked up as high as 100 million gold coins.

It is not just because of the attribute. One should consider the costs of the high explosives and casings, neutron reflectors and tamper materials, safety and stabilization features, etc…

The Anti-matter Warhead