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

Within half an hour of time, Mark neared the destination and stopped his flight. There was an obstacle in front of him in the form of a golden barrier.

It was covering the entire mountain. As for the barrier supposed to be created by the allies (Kunlun sect elders), it hasn't happened yet.

The Barrier of Gold Dragon, Jinlong

Description: It is a self-healing barrier created by the guardian beast of the Wuji sect. The barrier is like a defensive shield that will block the attacks from outside but will let the attacks from within the barrier pass through it.

As Mark was inspecting the barrier, the griffin stopped beside him and Xie Mei said, "I heard that there is a grand mage surnamed Wang in the enemy's forces. Only he could conjure such a marveling barrier."

The gold dragon, Jinlong