Each tier of the restriction array diagrams contains hundreds or even thousands of variations, but most weapon refiners don't need to learn so many, nor do they have access to all types.
A first-tier restriction array diagram can be inscribed on magic artifacts made from first-tier materials, with a maximum of sixteen diagrams.
Four or fewer diagrams result in a low-grade magic artifact, five to eight in a mid-grade
, nine to twelve in a high-grade, and thirteen to sixteen in a top-grade.
While more restriction array diagrams result in a higher-grade magic artifact, the forged artifact blank must be able to withstand them.
Ximen Changqing used mid-grade first-tier black iron for practice.
Even with a perfectly forged blank, it could only withstand a maximum of eight restriction array
