Merlin stands before the sword in the stone as the crowd gathers. He has known who would draw it since the day the boy was born. What he has not known is the figure watching from the forest — a hooded stranger who has not aged in twenty years. When their eyes meet, the stranger nods. Merlin's blood runs cold. He has seen that face before. In a vision. And in that vision, the stranger was the one who pulled the sword.

The crowd parts. Arthur steps forward. Merlin opens his mouth to speak — and the stranger raises a hand. The world holds its breath. Then the stranger turns and walks away. Merlin knows he must follow. What he learns in the forest will change the fate of the kingdom.

Merlin has cast a spell to show the young king a vision of the future. Something breaks. The vision does not stop. Arthur sees Camelot fall, the Round Table shattered, and a grave with no name. When Merlin finally pulls him back, Arthur is shaking. He asks: was that true? Merlin does not answer. He is staring at his own hands. In the vision, he saw himself — but older, wearier, and trapped in a place without time. He has never told anyone about that part of the prophecy.

A knock at the door. It is Nimue. She has come to return something she borrowed years ago: a book. The book that contains the spell Merlin just used. She says: you left out a page. I thought you should have it back. The page she hands him is the one that explains how to undo what he has done — and the cost is written in a language he thought no one living could read.

Merlin has been summoned to a gathering of the ancient powers — beings who remember the world before kings and swords. They have one question: is Arthur worth saving? Merlin speaks for the boy he has raised. The council listens. Then one of them, a figure of smoke and stars, speaks: we have already decided. We are not here to judge the king. We are here to judge you. You have broken a law. You have loved a mortal. The penalty is the loss of your freedom.

Merlin laughs. He says: I have loved many mortals. The figure replies: not like this. And they show him a reflection — not in a pool, but in time. In the reflection, Merlin sees himself in a crystal cave, and he sees who put him there. The face is one he trusts with his life. He steps back. The council rises. The trial is over. The sentence begins at dawn.

Arthur is no longer a boy. He is a king, and he has come to Merlin's tower with a question: how do I know when to stop fighting? Merlin has waited years for this question. He tells the king a story — about a wizard who thought he could shape the world, and the moment he realized the world would shape him instead. Arthur asks: what happened to that wizard? Merlin looks out the window. He says: he is still learning. And one day, someone will lock him away so that he can never interfere again. Arthur frowns. Merlin smiles. He says: do not try to save me when it happens. It is the only way the story ends correctly.

A bird taps at the window. Merlin opens it. The bird drops a single feather and flies away. Merlin's smile fades. He turns to Arthur and says: the lesson is over. Leave now. Do not look back. Arthur obeys. When he is gone, Merlin looks at the feather. It is not from any bird he knows. It is from a creature that should not exist yet — and the message written on it in invisible ink is from the future. It says: she is coming. And it is signed with a name that will one day be famous: Morgana.

Merlin walks into the forest to meet an old enemy. They have struck a deal: one spell in exchange for peace. The enemy is the Lady of the Lake. She wants a spell that will let her sleep until the world has forgotten her name. Merlin agrees. He casts it. As she falls into her long slumber, she whispers: you will forget too. Not your name — your choices. One by one, you will forget why you made them. When you forget the last one, you will join me here. He asks: when is that? She smiles. The day the king draws the sword. He has already drawn the sword. She says: no. The second time. And then she is gone.

Merlin returns to court. Arthur is in the throne room, holding a blade he has never seen before — a blade that has just been given to him by a hand that rose from the lake. Merlin looks at the sword. He looks at the king. He tries to remember why he came back. The reason is slipping away. He holds on to one thought: protect the king. He does not remember that the thought is the last one he will keep.