Refinery, what is naturally associated with?

There's no doubt that's fire!

How to forge weapons without fire?

Fire is needed to extract the constituents of that ore.

In fact, the same is true. Weapons can't be forged without fire.

But unlike alchemy, without fire, you can actually become an alchemist!

That's specializing in texture!

does not involve the forming part of forging weapons, only responsible for the last vessel engraving, this kind of person, has a unified title - vessel engraver!

is almost the same as Danwenshi.

The only difference is that Danwenshi carries on the engraving after Danyao Chengdan, and whether Danyao engraves Danyao or not has no effect...