Fey

Fey were creatures from the Feywild (see below), a parallel plane to the Prime. Many were typified as having supernatural abilities and a connection to nature or to some other force or place. The language of the fey was called Sylvan. Fae, or faeries, as many liked to be called, were creatures of any size, shape, texture, or smell, that exemplified and inhabited natural wonder. They went by many names, like "Green Folk", "Fair Folk", "People of Peace", sometimes "Wee folk".
They were ruled by noble eladrins and other archfey.
There were many unsubstantiated legends about fey on Toril, especially in the forested areas of the Dalelands, and the like. Faeries, in good and friendly lands, with warm lush forests and babbling brooks, were said to be short friendly folk, with a twinkle in their eye, pronouncing wealth and good luck on those deserving, who often happened to be the mortals who found them. In other places, blasted lands and choking swamps, fey were seen to be mad redcaps, devouring infants, corrupting youth, and bringing bad luck to any in whom they happened to take interest. The truly uninformed would see the elves, dwarves, gnomes, and even goblins as a form of fey.
As with any legend, there was a taste of truth within. Many fairies were tiny, and many of the legends about fey were quite true. Many fey, pixies, for example, could only be seen by those to whom they choose to reveal themselves, though powerful wizards could often make them out. Elves and fey were united by common belief, by their connection to natural purity, and for the fey, this was enough to create a connection of appearance. Gnomes enjoyed making light of supposedly serious things, and this united them with fey as well, though only in attitude. Fey and goblins might be connected more closely, by age-old blood lines, but this was conjecture.
As for whether fairies desired weal and woe, both were the case. Fey were creatures connected closely to nature, and just as rain from clouds saved farmers and troubled travelers, so did fey help some and injure others. Fey were a people of many different alignments and interests, like humans were, and just as most of humans, dwarves, and elves concern themselves little with the fair folk, so the fair folk, by and large, concern themselves very little with the mortal races.
The darkest and most powerful legend about fey went back eons, to the creator races. Some sages claimed that fey creatures known as the leShay were one of the four, possibly five, creator races. Others passed this off as pure nonsense. Going to the source, asking ancient fairies, proved only to be a headache, alas, as none seemed interested in providing a straight answer.
It was said that to protect oneself from fey one should carry iron, wear the color red, turn their clothing inside out, or be near running water. Iron was said to be detrimental to the skin of faeries, the color red and inside-out clothing a sort of camouflage because the Fair folk couldn't see it, and running water a source for disrupting magic spells or bad luck.
FEYWILD The Feywild, also known as the plane of Faerie, existed as an "echo" of the Prime Material Plane.  It was from here that the fey originated, giving the Feywild its name, and it was also a place of unusually potent magic.
As a parallel plane to the Prime, the Feywild's geography was similar, though not entirely identical, to the geography of the Prime. Similarly, just as the geography was reminiscent of Toril's, its inhabitants and many creatures existed as fey "echoes" of Prime creatures. 
Arcane magic ran more freely and powerfully in the Feywild than it did in the Prime and it was for this reason that so many of its inhabitants were magically gifted. The Feywild was also reputably beautiful compared with either the Shadowfell or the Prime.
Though much of the Feywild was the same as the Prime geologically, there were differences, and more importantly, the lands answered to different powers than those on Toril. Much of the elven or eladrin civilizations had their earliest roots here and abandoned remnants of their culture littered the landscape. Unlike the elves, however, who had all but abandoned the Feywild, some eladrin remained behind in the Feywild, most notably the "noble" eladrin. These eladrin still maintained strong kingdoms and citadels, in addition to the newly arrived citadels of Evermeet and Sildëyuir from Toril.
The Feydark was the echo of Toril's Underdark in the Feywild and, like most parts of the Feywild, it was more majestic and fantastic than its natural counterpart.[7] Inhabited by the fomorians, a fey echo of the titans,[9] the Feydark was a cavernous world of maze-like tunnels and portals linking to Toril and other planes.
HistoryEdit The Feywild was created by the Primordials, beings of power comparable with the gods. Finding some things of the Prime too "bright" or too "dark," the Primordials tore these parts from the Prime, creating the Feywild and the Plane of Shadow (which later became the Shadowfell), respectively.[10] The creatures that inhabited this world were the fey and came in many forms. For a time, the Feywild was located in close proximity with the Prime and the inhabitants of both planes interacted regularly.[11] It was during this time that the fey first immigrated to Abeir-Toril. There, they came into conflict with dragons and ushered the elves to follow them, hoping that the (at the time) primitive creatures would help them. Later, following a magical experiment gone terribly awry, a small group of eladrin also arrived on Toril. After a while, these eladrin mixed with the elves to the point that it was difficult to tell that they were two different species.
Later, the Feywild slipped further and further away from the Prime. Contact between the two planes ceased except through intermediaries or powerful arcanists and the plane was largely forgotten. By this time, however, large numbers of fey, eladrin and elves populated Toril. However, the relationship between the two worlds was reversed with the Spellplague.[7] The destruction wrought by Mystra's death yanked the Feywild back into proximity, opening up new crossroads to the plane. Evermeet vanished, slipping into the Feywild, and in reverse, new communities of fey creatures were transposed throughout parts of Toril.
Since the barrier between these two planes became much thinner, the eladrin discovered that their racial bonds with that realm allowed them to slip into and out of the Feywild.[citation needed]
Inhabitants In The Fey wild
While many of those living in Faerie were untamed, large numbers also congregated according to race or by political allegiance.
LeShay were to eladrin what eladrin were to humans. They were undoubtedly some of the most powerful creatures living on the plane.[citation needed] Noble eladrin were exceptionally powerful examples of their kind. While the eladrin on Toril became more like the elves, the eladrin in Faerie became more attuned to the elemental magic inherent in that plane.
Seelie fey were followers of Titania, the queen of good-aligned fey, and served her royal court.
Unseelie fey followed the Queen of Air and Darkness and worked to destroy the Seelie fey. Fomorians ruled much of the Feydark in a twisted parody of the surface eladrin. They commanded many servitor species—the most useful of which are the cyclopses. When a person died in the Feywild, the blood that came out could spawn redcaps, a type of bloodthirsty creature that ceased to be if it did not have fresh blood on its cap every three days.

• Boggles were a type of mischievous creature that was spawned when a person was overcome by loneliness or abandonment.
• Meenlocks were a deformed fey that spawned when someone was overwhelmed by fear in a place touched by or in Feywild.
• Hag were a malicious and varied race of fey that delight in tormenting mortals.
• Sprites were a small race of small fey with the ability to tell if a creature was good or evil by the sound and feel of the beating of the creatures heart.
• Satyrs were raucous fey that looked like a man from waist up and a goat from waist down.
• Goblinoids, ogres, giants, and blights could be found in the more sinister regions of the plane.