Vaati's Palace

Vaati's Palace, also known as the Palace of Winds, is the fourth and final stage of Four Swords. It also serves as the abode of Vaati. The stage can only be accessed by obtaining the three Great Keys from the Great Fairies of Forest, Flame and Ice.

Overview
Vaati's Palace is the final level to unite the four Links and reseal the Wind Sorcerer Vaati within his prison. It is stated in the game's prologue to have been the personal dwelling of the Wind Sorcerer Vaati many long years in the past, when he terrorized Hyrule's people and captured beautiful maidens that struck his fancy, whom he would then carry off to his palace among the clouds to keep for his own pleasure. At the game's beginning, Link and Zelda go to check on the seal of Vaati's prison, which is kept locked by a key, the Four Sword. They are soon after ambushed by the Wind Mage himself, who had escaped due to the weakening seal on his prison and had hidden nearby when he heard the pair approaching. He kidnaps Zelda and states his intent to make her his bride before knocking Link out and carrying Zelda off to his Palace in the sky above Hyrule. Left with no choice, Link is forced to draw the Four Sword from its resting place in order to reach the palace and confront Vaati, causing him to be split into four copies of himself.

Entrance to the Palace
To enter Vaati's Palace, the four Links must find the Great Keys throughout Hyrule that can open the way to the Palace and thus allow them to rescue Zelda from Vaati.

Themes and Navigation
Inside the vast Palace, the four Links are forced to battle numerous foes while also trying to keep from falling to their deaths from the Palace's heights, in order to reach its top and take on the Wind Mage himself. With the power of the Four Sword, they succeed in besting him once again atop the Palace, resealing him within the Four Sword's blade and freeing Princess Zelda from her captivity.

Trivia

 * Though in-game, it is called Vaati's Palace, Vaati himself calls it "[his] palace of winds" in the game's intro.