WARNING: If you don't want to know what happened in this episode, don't read this photo recap!
The team is still trying to bring magic back to the world, and they've collected the seven keys to do so. They know that they have to find a "Castle at the End of the World" and they need to get there quickly, because the people who work in the library want to control magic by syphoning it off.
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Julia, meanwhile, has been reached by a messenger god named Iris, who arrives to tell her that she's a full-on goddess now. Turns out, Our Lady Underground gave Julia that magic seed, and now she is "Our Lady of the Trees." She gives Quentin enough magic for one spell, says her goodbyes, and off she goes to fulfill her destiny.
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The team realizes that someone must have built the Castle at the End of the World and figure out that it was Calypso: an architect who built the castle as a prison to trap a great power. There is a knight there to protect it, but it's powerful. So powerful that Prometheus gave up his power to protect it.
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The warning, though, is very clear. They'll get in and figure out what they need - but what's locked inside that castle can never ever be allowed to escape. (We've heard this before, in an alternate timeline, right?)
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Julia learns a lot about how to be a goddess, but still keeps feeling her friends' pain as she goes about it. Even though Iris tells her to move on from this, Juila can't seem to let it go.
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Using the magic Julia gave him, Quentin goes to the Castle and asks about the fountain of magic. He meets Ora, who agrees to open the castle door for them. But there's a catch.
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Quentin tells the gang that he's going to stay behind in the castle and take over Ora's position. Margo and Eliot suggest that they take the god-killing bullet with them, but Quentin is adamant. He's going to sacrifice himself for the team, so they can all save magic together and protect whatever's in that castle from escaping.
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Meanwhile, back in Fillory, the Fairy Queen tells Fen that someone is hunting her people. Fen sets a trap and discovers it's, yes, Irene McAllister. Now it's the Queen's turn to offer herself for a sacrifice. In exchange for fairies always being safe from harm, the Queen offers herself up to the McAllisters to make into magic cocaine. Who accept the deal.
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And so, the Fairy Queen tells Irene McAllister that she'll regret this deal, and lays down her life in a brutal murder. Once and for all. The Fairy Queen is dead. Long live the Fairy Queen.
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Meanwhile, Alice goes to Dean Fogg. She needs a potion that will make her forget all magic and assume a different life forever. From there, she finally tells Quentin she loves him and that she'll miss him, even though she won't remember him. Oh! Also! It turns out, Dean Fogg is in cahoots with the Head Librarian.
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The gang reaches Castle Blackspire and it turns out that everyone has different plans. Alice sneaks off, and Eliot and Margo exchange glances as Quentin meets with the monster. That monster turns out to be a youngish boy who is all-powerful and simply WANTS. Even the Gods can't stop him. But...
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Eliot has brought that god-kiling bullet and shot the kid. Eliot didn't want Quentin locked in a prison for the rest of his life. Which is a dreadful mistake, as it turns out. And then…Alice also decides to take matters into her own hands.
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Alice conjures a spell to destroy all the keys because she believes humans can't handle magic. She succeeds in melting them and trying to escape. But Margo's not about to let her.
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Trying to escape, Alice runs into the monster, who has possessed the body of Ora the Knight. They seem to be losing control of the evil they aren't supposed to release.
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As Eliot and Margo bring Alice back to the throne room to fix the key problem, Julia appears. She uses her god-magic to recreate the keys. Because of Quentin's willingness to sacrifice himself for the team, she is sacrificing her god-powers to recreate the keys. Just like Prometheus did.
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Not so fast. Irene McAllister, that representative of the Library, and Dean Fogg turn up and place the syphon on top of the fountain. Effectively putting the Library in charge of all magic again. The quest actually failed.
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Dean Fogg gets to re-open Brakebills, but magic is spotty, so he now has to request magic current from the Head Librarian, who, by the way, has Alice trapped there for breaking her deal with the Library. It seems everyone else though, is off doing things...
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And they don't have magic and they don't know who they are. They're all other people with no memory of their past magical selves.
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And Alice warns Dean Fogg that the monster from that castle could escape by jumping bodies.
