Now Xu Mu's skills can be called weapon-crafting, not just tool-making.
Because this world lacks spiritual energy, although he can use all sorts of divine skills and methods of his original body, they can only be driven by consuming his qi and blood.
This consumption is much more difficult compared to previously directly absorbing nature's spiritual energy, or even setting up a Great Array to assist weapon crafting. The consumption is also much greater.
If he wasn't extremely skilled in weapon and alchemy crafting in his previous life, even if he possesses True Flame now, he would probably not be able to create a Magic Artifact.
Aside from the different types of energy he uses, which is not easy to control, there are many other difficulties.
For instance, the metallic ores used for weapon crafting. Because this world lacks spiritual energy, these ores are quite different from those in his previous life, and refining them is quite energy-consuming.