Compared to crafting Low Grade Spirit Artifacts, the difficulty in crafting Mid-grade Spirit Artifacts hasn't heightened significantly, the primary difference is actually in the artifact refining materials.
The materials for crafting Mid-grade Spirit Artifacts are far more precious than those for Low Grade Spirit Artifacts; the difficulty itself hasn't increased much. The grade elevation mainly relies on the power of the materials themselves.
The most proficient Artifact Refiner can use materials meant for Low Grade Spirit Artifacts to craft Mid-grade Spirit Artifacts. Ye Zhen, however, is far from reaching that standard. It's already quite good if he can craft Mid-grade Spirit Artifacts using Mid-grade materials.
There's even a possibility of crafting Low Grade Spirit Artifacts due to errors in technique using materials meant for Mid-grade Spirit Artifacts, which is also a method many Artifact Refiners employ to enhance their success rate.
