The Night Magic Was Not Woven

Every seven years, all Fey gather at the The Hall of Dust and put aside their differences to celebrate The Night the Magic is Woven. That night the two Fey Courts - Summer and Winter - each bring a tribute, people who are amazing artists or crafters, or someone who’s specially beautiful, strong, peculiar or exceptional somehow. They are usually from other planes, people the Fey have either kidnapped or welcomed into their Courts, someone who wandered into the Feywild and was captured for this or some other purpose. Sometimes, if they're looking for a particular favor, a Courtless Archfey will also present a tribute. Anyone can bring one, but usually this is reserved to the Archfeys and the Queens themselves.
The tributes are to be gifted to the Thread, a representation of Magic, Time, and Fate. The Thread is the being, concept, idea - or perhaps all of those - that keeps reality together, according to the history and beliefs of the Feywild. They have their own small universe, a Plane separated from all others but that can still influence them, since magic and time are everywhere. They’ve been living isolated in this place for as long as it is known. Try as many have, no one has found a way there. The Thread only ever shows up during the Night, for a few moments when the Clock strikes true midnight, merely to collect their tributes, to bless the Wild, and let the clock continue to turn, taking the world along with it.
Seeing as the Thread is responsible for such a paramount part of all their lives, the Fey Folk believe they must appease them. This tradition has been going on ever since time immemorial. If it doesn't happen, bad luck will befall the land, and all that is bad will come to be. Magic, Time, and Fate will unravel, will become chaotic, and who knows what would happen then. Even the Fey would rather not risk compromising such an important tradition, no matter how mischievous they are, how cruel they can be. In this everyone seems to be in accordance.
No one remembers what the Thread looks like. They all see them during the Night as the tributes are gifted to them, but after that it's as if their memories become blurred, and there's nothing concrete there beyond an idea, a feeling, a belief. But they all wait with bated breaths - even the Queens, the highest power in the Feywild for all nights, except this one.
So they wait.
And they wait.
...And wait.
...
...

The Night Magic Was Not Woven

On the most recent Night, after the tributes had performed to showcase their abilities, after the Clock, the main feature of the The Hall of Dust, which remains there while the rest of the house has fallen to ruins, had struck true midnight... the Thread did not appear. Everything had gone according to plan, all the rules and beats important to this tradition accomplished to perfection and yet... nothing happened. People waited, and waited, began worrying, worried even more, and no one showed up.
Then a scream pierced the night.
A favorite sidhe of the Queen of Air and Darkness was murdered on the stairs of the Hall of Dust, stabbed in the back. The only clue as to whom might have done it was a dragonfly necklace clasped in his hand. It was made of the most beautiful gems, and people quickly figured out what it was: a token from Queen Titania, one she only gives to her inner circle.
The doors of the Hall of Dust were immediately closed - no one could go in or out. The matter was investigated, for violence is completely forbidden during the Night. If this had happened before the Thread showed up, it could be the reason all went wrong. The Courts always promise to maintain the peace during this event, no matter what, but if a member of the Summer Court had murdered someone from the Winter Court... it could mean war. Worse than that, if the Thread didn't show up, it could mean... well, the beginning of the end of everything.
The truth - or as close to it as one could get - was eventually uncovered. A member of the Summer Court, Queen Titania's favorite bard, had indeed murdered this close friend of the Queen of Air and Darkness, but they claimed they had been forced to do so. They had had no control over their mind as their body acted against their will. As much as that sounded as a poor excuse, truth spells corroborated their words. But if they had been made to do this heinous act, to disrupt the Night in such a grim way, then who was the real culprit?
The Archfey were all gathered in the great ballroom of the Hall, along with the ones responsible for this investigation. Upon doing so, they realized one major player was missing: Nicnevin, the self-named Queen of Witches. She had managed to disappear before the doors were closed. Even her witches were nowhere to be seen, although they had all been there at the start of the event. This could only mean she was either guilty or she'd been involved in letting this happen.

The Search for the Wicked Witch

She was pursued. The group investigating this matter traveled to her home but was only met with violence, her witches protecting whatever secrets hid within. They managed to defeat them, and inside they found notes upon notes on research Nicnevin seemed to have been conducting. How to change someone's Fate. How to control someone's story. Perhaps she wanted to change her own story or role in the Feywild, perhaps this was about someone else. These were cryptic notes going back for weeks, and although they did not prove she was guilty, they didn't prove her innocence either.
There were hints someone had been hiding in a secret part of her mansion. While searching for whom this guest might be, the group found a witch trapped in one of the manor's rooms, the only survivor of the previous battle. She claimed the witches all knew about Nicnevin's plans to disrupt the Night, to create a distraction, and she had wanted nothing to do with it. She had been ostracized for it, kept at Nicnevin's house while the others had traveled with her to help her with her plan. She was taken with the group in case she had more information about what happened.
The Thread still hadn't showed up. The Clock froze, and night stood still all around the Hall of Dust. Even in the rest of the Feywild the sun never rose, all the land set in perpetual dusk, or twilight. A sign that things were starting to break.

Owl by Yoshioka

When the group analyzed the witch's notes, they saw mentions of the Night Collector, an Archfey who had once been a tribute herself, but who had been allowed to come back and collect people for the Thread. If anyone knew what might be happening, it was her. They found her home in the middle of a forest, a clearing surrounded by birds - either flying free, or in cages made of the most varied of materials - and although she did have some answers, she didn't know how to fix anything.
In fact, she thought it was too late to fix any of it.
The Night Collector told them how she had been visited by someone claiming to be part of the Thread. Not the Thread as a whole, but a piece of them, a fracture. This had happened days before the Night. Having been a tribute herself, she had a special connection to the Thread, so she knew something was wrong. She had tried collecting as many people as possible, turning them into bird as she waited for the Thread's return, so perhaps she could appease them, please them in case she had nothing something wrong. But when they finally visited her - or at least part of them - it was nothing like she'd been expecting. They told her how the Thread had broken, how the connection to their plane had become unmoored, lost. They needed her help, but everything felt... wrong. And when the Night Collector hesitated in helping this person who claimed to be the Thread, they Cursed her. They took part of her power away. It was only then, when confronted with such powerful abilities, the she knew they had been telling the truth. But by then it was too late.
Since then the group has been pursuing the Queen of Witches and their friend, the one who claims to be a part of the Thread. And ever since that Night, the threads of magic have been unspooling, unravelling, and the world itself has been coming apart.

The Consequences

Both Courts remain at a temporary peace while this disaster hasn't been fixed. The Queens and their Archfeys are staying at the Hall of Dust, using whatever resources they have available to them to find Nicnevin, to find the Thread, or at least a way into the Thread's plane.
This might be the only good thing that came out of this conflict. Time was never an exact thing in the Feywild - it shifts, it changes, but at least a day comes and go, gives place to night, and the cycle continues. The way two places might be in completely different times of day even despite being next to each other might not make a lot of sense, but for the Fey it did. But now... Time seems to be frozen. Around the Hall of Dust night is complete. There are places where it's dusk, twilight, or the sun has just set, but there is no place in all of the Feywild, right now, where it's day, where the sun is out and shining bright.
The Stories themselves also seem to be broken, to be lost. Stories are alive in the Feywild, fairytales from other worlds and other cultures are real people there, always caught on a loop, reliving their stories over and over, only one goal on their minds. They have a Story to tell, it is how it is. But now they'll appear someplace they shouldn't be. They won't know what it is they should be doing, or they'll simply disappear, or get mixed up within other Stories' plot. Some have even started appearing in the Material Plane, which has lead people to believe that whatever is happening, it's going to spread way beyond the Feywild, until it has engulfed everything within its cursed embrace.
Even Magic isn't working as it should be. Sometimes spells fail in ways they shouldn't, people who have a certain control over magic will lose it, and a weird, chaotic effect will happen instead.
Nothing is as it should be. And it's only becoming worse. The Feywild walks a fine line between balance and chaos, and now chaos is becoming stronger and stronger, pulling everything into its influence. If no one manages to find the Thread, to fix the broken pieces of this world-spanning puzzle, the world itself might come undone.

The Moirai by Neith

Major Players

Queen Titania: She is generally a good person, whatever that means for the Fey, but she still has quite a chaotic nature. She is prone to fits of jealousy and anger in equal measure as unbridled curiosity, joy, or serenity. A lover of the arts and all that is beautiful, she surrounds herself with performers of all sorts - just as long as they align with her ideals of beauty and talent. She's married to King Oberon.
Queen of Air and Darkness: She’s the sister of Queen Titania, and her polar opposite. Although she’s also a great appreciator of beauty, her kind is colder, stranger, more macabre. The Queen herself is almost the personification of Winter - cold, distant, unforgiving. Few are those lucky enough to witness another side of her, which exists, but is rarely seen.
Nicnevin: Has titled herself the Queen of Witches. There are only two Queens in the Feywild, but many have tried to use the title as well, Nicnevin being the one who has lasted the most among them. As long as she didn't bother anyone, the Queens let her have her coven, lead them, call herself whatever she wanted. It seems that while it looked like she was keeping to herself and her magic potions, she was also brewing something else in secret.
The Night Collector: She gathers and trades in stories and memories, and her motives are particularly opaque even for one of the Fair Folk. She offers mortals something like a story, a small gift, in exchange for something that is a lot more precious to her, such as a unique memory, a voice, a treasure. She transforms those who cross her into birds, which she keeps in cages of gold, silver, bone, or other varied materials.
She was one of the first tributes to the Thread, and was always to come back to the Feywild. These memories and people she collects are all in an effort to select the best people for the Thread, who has never actually returned to collect them. Lately a lot of disappearances had been occurring in the Material Plane, and she was responsible for most of them.