I think the mother had some kind of deal with a demon??...so they have devils power and technically subordinates of demon.
I think...
Obviously not.. i mean could you put your trust on someone you hired?
not sure if its true but i saw a comment earlier about only a few of the wings being real and Ahin is one of them. Remember how he heard leticias voice? but the others i think get their power from where the sainteness gets her magic.
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Spoiler
Josephine was a temporary saint and her daughter is the real saint in order to maintain her power as a saint Josephine makes contract with evil thus tricking the real wings into hating their true master. Right now they're scattered so FL will meet her wings once she leaves this bitch
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Ahuin is real he will come around/was tricked by evil. Tenua is a bitch and shall forever be he is technically a wing but a tainted one. The wings that have been there the longest probably started when she was the temp Saint and were tainted when the fake gave made a deal with the devil
I think Noel is the only true wing among the nine that the rest of them are fake, including Ahin. I bet Josephine hired and gathered a bunch of people to pretend to be a wing of the saintess and that Josephine only came across Noel out of coincidence, probably due to rumors reaching to her ears when she was looking for the Saintess’ nine wings