In truth it would be interesting to learn more of the nature of fairies. Its safe to say they are a form of Arcane entity and Lily is the only one we have ever met but I wonder if they were originally shaped by magic ala Carbunkles or if they naturally occur. Maybe we will learn more from either the lore book or from future Job quests.

It is kind of interesting that Lily's aspects seem to correlate with the Sects ASTs use, though Selene doesn't offer any additional Mitigation.