Originally Posted by
rawker
TLDR version:
Just to be clear... these fairies come from the job crystal. That is why Arcanists, having the capability of materializing Carbuncles out of crystals (Topaz, Emerald, etc), were able to do so with ease. These fairies also act as memory cards where they have the memories of their previous wielders. That's also how we were able to unlock our actions. Basically, you are still an Arcanist but using the spells of scholars before you. We were merely borrowing those spells.
The SCH crystal the WoL wields was originally owned by Surito Carito, before transforming into a Tonberry due to a curse, and the name of the fairy was Lily. Lily had 2 aspects, Eos and Selene. And due to the curse, he can no longer attune to the crystal hence he entrusted his job crystal to us.
end of TLDR.
Scholars are not fairy healers. They are not slaves to the fairies. These fairies are tools used by the scholars since they were military strategists so they may have employed the divide and conquer strategy of having a delegated entity to do all the healing for them so they can focus on the strategic aspects of their spell casting.