C1215 Erythrine
Spirit Armor s were hard to find, let alone two sets of armor.
Not many cultivators could afford to use inner or outer armor. If one was strong, then a low level Spirit Armor would have no effect and if one was weak, they would not be able to buy Spirit Armor.
The amount of Spirit Armor that could be refined was extremely little, and most were refined by the Golden Core Cultivator s