The Tuatha Dé Danann
Spoken of in myth and legend in the British Isles, particularly among the folk of Ireland and Scotland, for centuries are the Fae. There is even a religion dedicated to the arts and practices which have grown up out of myths regarding the 'wee folk'. Some have said they were not supernatural creatures at all, but the descendents of lost Atlantis, granted many gifts but ultimately human and frail accordingly.
The truth is somewhat different, amidst all the legendry and myths remains a common thread though: the faerie folk are enamored with humanity and can be cruel or kind, beneficent or malignant.
The Faerie are the dreams of an older world, its high fantasy and its darker nightmares, born before the sciences had reduced the mystery of the world into a series of rote mathematical functions. They are the imagination of youth, the sleek glossy haunts of adolescence, and the mingled sorrows and joys of adulthood. They call themselves the "people of the Goddess Danu" and claim they were born from the womb of the Earth Mother whom some call by the name Gaia.
The Goddess Speaks
It has been centuries, some say millennia, since the Goddess Danu has spoken to her people directly, but it has been done. From grandest King to lowest dreamweaver, the Fae have been commanded by their Maker to return to the mortal world they abandoned years ago. Obedient to their Goddess, the Fae dispatched spies and watchers in order to ascertain the state of affairs, and those spies have since returned to deliver their reports. The Goddess did not hand them mandates, or laws to govern their affairs upon their return, only abjuring them to tend to their duties as diligently as they ever had - to nurture dreams and preserve the Earth, which is a physical manifestation of their Goddess.
On October 31st of the year 2020, the Congress of the United States announces a treaty has been signed with emissaries of the Fae, granting them the dubious legal status of semi-citizens and subjecting them to the dual laws of the United States and their own kind.
The Faerie Host
"Come away, O human child!/To the waters and the wild/With a faery, hand in hand/For the world's more full of weeping than you can understand."
~William B. Yeats, The Stolen Child
"Faërie cannot be caught in a net of words; for it is one of its qualities to be indescribable, though not imperceptible."
~J.R.R. Tolkien, Tolkien on Fairy-stories