My Otherworldly Manufacturing System

After transmigrating into a game's fantasy world, Fang Yuan gains an unusual talent: the Sekana Manufacturing System, which lets him use materials to create all sorts of unexpected devices anytime, anywhere.

What do you do if you can't beat someone in this other world? Make a weapon and take them on.

What do you do when there's a war? Become the biggest arms dealer around.

What do you do when facing a boss? Build an apocalyptic mech...