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The Flaga is a creature with origins in Renaissance-Era European mythology, legend and folklore. In particular, accounts of its existence arose within the occult works of physician, botanist, alchemist, astrologer, and general occultist Philippus Aureolus Theophrastus Bombastus von Hohenheim (also known as Paracelsus).
It is unknown from where they originate, though some speculate that they are merely Fairies, Pixies, Ghosts or Demons who channel their powers through reflective surfaces. On the other hand, some have surmised that Flagae are a distinct class of elemental spirit (attuned to reflective surfaces in some sense); thus, they could be native to the Elemental Realm of Water, the Elemental Realm of Earth (dwelling in domains of glass and/or reflective stone) or even the Elemental Realm of Light. They may even be native to the Fauna of Mirrors alongside the Mirror People.
For all anyone knows of their true nature, Flagae could be the spirits of deceased Mirror People, imbued after death with supernatural power, not unlike the Ghosts of other species.
Descriptions of the Flagae are highly difficult to ascertain, due to their connection to mirrors and other reflective surfaces. And so they are often conflated with Familiar Spirits and other supernatural creatures which are various and numerous in possible appearances.