To advance to the Fifth Rank, in addition to Spirit Power Sublimation, there are two other essential conditions.
First, the original source of a Crack must be contained.
Second, a Fifth Rank profession card.
In this regard, the containment of a Crack's original source requires a reliable large workshop.
Once the Crack is contained, it will be transformed into a special energy sphere, which cannot be placed into a backpack card until it has been completely made into a stable weapon.
It must be stored in a specific space for strict containment.
Any slight carelessness, and its Deformation Level will rise, thereby contaminating the entire world.
This kind of space needs to prevent contamination and also possess extremely high durability.
This is consistent with the concept of building a 'Sanctuary'.
In a sense, building a Sanctuary is also equivalent to establishing a Crack Workshop.
Second, the crafting of a Fifth Rank profession card.