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Julian May's Saga of the Exiles tells the story of human malcontents who leave the Galactic Milieu, a Federation of six allied psychic races including Humanity, and travel via a Portal to the Past to the Pliocene Era of Earth's history 6,000,000 years ago. The past is not quite what anyone expected.The time-travelers arrive to discover the Pliocene is already inhabited by a dimorphic race of aliens ('exotics'). The exotics, who have fled their home galaxy because of religious persecution, are marooned on Pliocene Earth as well. The exotics have difficulty reproducing on Earth, and so have enslaved many of the humans in an effort to overcome this problem, interbreeding with the more robust humans and influencing the legends of Celtic Mythology and The Fair Folk.The books making up the tetralogy are;
The Many-Colored Land
The Golden Torc
The Nonborn King
There was a non-fiction book entitled A Pliocene Companion that featured a guide to names, places, objects and so on and some essays by the writer elucidating certain aspects of the series. Any entry below citing Word of God is likely to have this as its origin.
I fight with the weapons I have. It's the only sensible way.
The Fair Folk: The Tanu and Firvulag, who match well to the Seelie and Unseelie Courts respectively, the Tanu representing the tall and beautiful archetype, while the Firvulag the darker, more goblin-like side. Most of the named exotics correspond directly to members of the Tuatha de Danaan and the Fir Bolg or Fomor — Nodonn/Nuada, Lugonn/Lugh, Pallol/Balor, et cetera.
Fantasy Gun Control: the types of weaponry permitted through into Exile are strictly controlled, and the Tanu confiscate it all anyway. The Tanu and Firvulag don't use firearms, except for some of their ritual weapons.
Mars Needs Women: Tanu of both sexes love sex with humans, but they also use human women as surrogate mothers (their females can't carry a fetus to term on Earth) to the point of wearing them out with constant pregnancies.
Older Than They Look: Many of the the Ocala rebels have undergone rejuvenation, so they look thirty or forty but are really a few decades older. Owen Blanchard, the oldest of the Rebels, is about a hundred and forty and looks to be a normal old man. Marc is also self-rejuvenating; he looks fairly young but is actually about seventy at the time of the series.
Psychic Powers: The Tanu are organized into five psychic guilds: each guild has a guild leader and its own heraldic colours, which allow others to instantly recognize the person's primary metapsychic power. Coercive (Blue), Creative (Green), Psychokinetic (Rose-gold), Farsensing (Purple) and Redactive (Red).
Rag Tag Bunch Of Misfits: Pretty much every human who passes through the time gate, since almost without exception, they're people who don't, can't or won't fit into the society of the Galactic Milieu.
Really 700 Years Old: The Tanu and the Firvulag, many of whom came to Earth on Brede's Ship, making them at least about a thousand. And then there's Brede herself.
San Dimas Time: The time-gate always drops people six million years before the current modern date, so effectively the same amount of time has passed on both sides since travel began.
Shapeshifting: Many characters are able to shapeshift through use of the Creative Metafunction. Aiken Drum turns into a series of different animals reflecting his personal growth and increased metapsychic strength. Marc turns his son Hagen into a fish for a while as a punishment and in the later books Felice can turn into a raven. Also see Voluntary Shapeshifting below.
Stable Time Loop: Marc Remillard and Elizabeth Orme travel to the Duat galaxy to help them with their psychic development. Afterwards Marc returns alone to the Milky Way and attempts to raise the native species to operant metafunction. His first success is with the Lylmik, who are the ones who create the Galactic Milieu, against which the Metapsychic Rebellion take place, causing Marc to go back to the Pliocene where he meets Elizabeth in the first place...