Just like the devils from the Demon Church, the feys from the Barren Mystic Realm were also divided into different ranks of bloodlines.
The Demon Church's devils were divided into lower, intermediate, and higher. The higher devils were also known as the seven major devils.
If the lower devils were properly nurtured, there was the possibility they could evolve into intermediate.
However, it was very rare for an intermediate devil to evolve into a higher devil.
Regardless, nothing was guaranteed. After all, it had happened before.
The feys with the Barren bloodline equivalent to lower devils were the feys with the sham Barren bloodline. Their Barren bloodline was very weak and was almost no different from a regular fey.
However, if they were nurtured and a way was found to trigger their Barren bloodline, they could easily evolve into the feys with the Barren bloodline equivalent of intermediate devils, the feys with the Truly Barren bloodline.