The Feywild and Fey

The Feywild, also called the Plane of Faerie, is a land of soft lights and wonder, a place of music and death. It is a realm of everlasting twilight, with glittering faerie lights bobbing in the gentle breeze and fat fireflies buzzing through groves and fields. The sky is alight with the faded colors of an ever-setting sun, which never truly sets (or rises for that matter it remains stationary, dusky and low in the sky. Away from the settled areas ruled by the seelie fey that compose the Summer Court, the land is a tangle of sharp-toothed brambles and syrupy fens — perfect territory for the unseelie fey to hunt their prey.
The Feywild exists in parallel to the Material Plane, an alternate dimension that occupies the same cosmological space. The landscape of the Feywild mirrors the natural world but turns its features into spectacular forms. Where a volcano stands on the Material Plane, a mountain topped with skyscraper-sized crystals that glow with internal fire towers in the Feywild. A wide and muddy river on the Material Plane might be echoed as a clear and winding brook of great beauty. A marsh could be reflected as a vast black bog of sinister character. And moving to the Feywild from old ruins on the Material Plane might put a traveler at the door of an archfey’s castle.
The Feywild is inhabited by sylvan creatures, such as elves, dryads, satyrs, pixies, and sprites, as well as centaurs and magical creatures such as blink dogs, faerie dragons, treants, and unicorns. The darker regions of the plane are home to such malevolent creatures as hags, blights, goblins, ogres, and giants.
However, fey that exist in the prime material get altered by the land and it's inhabitants. All fey will (over time) take on physical chararistics that are inline with the region they live in. Additionally, Fey in Quinterra fall into two different categories. Submissive and Subversive. All Fey with listed alignments of Good are Submissive and all Fey with alignments listed as evil are Subversive. The alignment of submissive fey reflects that of the most powerful force in the area, IOW they will match. While the alignment of subversive fey mirror that of the most powerful force in the area, IOW they will be the opposite.
In the absence of an over reaching powerful force the fey become wild and unpredictable regardless if they are naturally submissive or subversive.

Fey Crossings

Fey crossings are places of mystery and beauty on the Material Plane that have a near-perfect mirror in the Feywild, creating a portal where the two planes touch. A traveler passes through a fey crossing by entering a clearing, wading into a pool, stepping into a circle of mushrooms, or crawling under the trunk of a tree. To the traveler, it seems like he or she has simply walked into the Feywild with a step. To an observer, the traveler is there one moment and gone the next.
Like other portals between planes, most fey crossings open infrequently. A crossing might open only during a full moon, on the dawn of a particular day, or for someone carrying a certain type of item. A fey crossing can be closed permanently if the land on either side is dramatically altered — for example, if a castle is built over the clearing on the Material Plane.

Feywild Magic

Tales speak of children kidnapped by fey creatures and spirited away to the Feywild, only to return to their parents years later without having aged a day, and with no memories of their captors or the realm they came from. Likewise, adventurers who return from an excursion to the Feywild are often alarmed to discover upon their return that time flows differently on the Plane of Faerie, and that the memories of their visit are hazy. These rules reflect the strange magic that suffuses the plane.

Memory Loss

A creature that leaves the Feywild must make a DC 10 Wisdom saving throw. Fey creatures automatically succeed on the saving throw, as do any creatures, like elves, that have the Fey Ancestry trait. A creature that fails the saving throw remembers nothing from its time spent in the Feywild. On a successful save, the creature’s memories remain intact but are a little hazy. Any spell that can end a curse can restore the creature’s lost memories.

Time Warp

While time seems to pass normally in the Feywild, characters might spend a day there and realize, upon leaving the plane, that less or more time has elapsed everywhere else in the multiverse.
Whenever a creature or group of creatures leaves the Feywild after spending at least 1 day on that plane, they will gain or lose time at random, unless accompanied by a powerful fey (CR 10 or higher in most cases). In that case the fey accompanying them can influence the effect. Alternatively, a wish spell can be used to remove the effect entirely on up to ten creatures.

The Archfey

Archfey are fey beings who have gained nearly god-like powers and established a position of preeminence among fey-kind. Each archfey has a unique appearance and set of abilities, most control a portion of the Feywild and have self-proclaimed titles. In some cases the archfey has been around so long that they are only known by their title, their name having become lost to the memory of mortals.
Some of them are powerful fey of many races, others are the awakened spirits of natural places such as forests or rivers, others the sentient incarnations of different types of animals, and others were noble eladrin so old and powerful they transcended the bounds of mortality.
Some archfey are regarded as deities and grant divine abilities to their worshipers. Archfey can be contacted by a willing warlock to form a fey pact.

THE SEELIE AND UNSEELIE COURTS
Two queens hold court in the Feywild, and most fey owe allegiance to one or the other. Queen Titania and her Summer Court lead the seelie fey, and The Queen of Air and Darkness, ruler of the Gloaming Court, leads the unseelie fey.
Seelie and unseelie do not directly correlate with good and evil, though many mortals make that equation. Many seelie fey are good, and many unseelie are evil, but their opposition to each other stems from their queens’ jealous rivalry, not abstract moral concerns. Ugly denizens of the Feywild, such as fomorians and hags, are almost never members of either court, and fey of independent spirit reject the courts entirely. The courts have warred at times, but they also compete in more-or-less friendly contests and even ally with one another in small and secret ways.