The Gathering is the name of the secret ending of Kingdom Hearts II.
The video starts with the view of a desert. A semi-transparent Ansem's report scrolls down the screen where one of them explains a detailed article on the Keyblade. There are a few shots of metal objects lying in the sand. The screen shows a man in armour (Terra) standing amidst the desert waste. He looks to one side and sees another armoured figure (Aqua) approaching. Terra turns his head again and sees the third figure (Ven) also approaching. As Aqua and Ven come closer, Terra walks towards three keyblades standing alone in the wasteland. The three keyblades are Kingdom Key, Way to Dawn and Mickey's Kingdom Key. Terra takes the Kingdom Key, Ven takes Way to Dawn and Aqua takes Mickey's Kingdom Key.
The screen zooms out to show Terra, Ven and Aqua standing in the centre of a field of Keyblades. They stand still for a few moments before something catches their attention and they all look up. A figure, too blurry to make out in the heat, is walking towards the three Keyblade Masters and words appear, briefly, on the screen in this order: "Master of Keyblade", "The lost two, "Memory of Xenahort", "Chasers", "Keyblade War", "It all began with..." and the screen goes blank showing the last caption entitled: "Birth by sleep".
Speculative Meanings
Sunset Horizons video