Lorule Castle

is a location in, and the final dungeon of the game. It is Lorule's incarnation of Hyrule Castle and thus is the home of the Royal Family of Lorule. The main item of the dungeon is the Red Mail. The final room of the castle, the Throne Room is demarcated by the game as a separate dungeon. The castle's boss is Yuga Ganon.

Entrance to the Castle
After Yuga has abducted both Princess Zelda and Impa from Hyrule Castle, he spirits them away to Lorule Castle through a crack in Princess Zelda's private office. Link gives chase, using Ravio's Bracelet to follow the fiend, and arrives in the private office of Princess Hilda inside Lorule Castle. Following Yuga's merging with Ganon into Yuga Ganon, Hilda casts a barrier around Lorule Castle, blocking the entrance supposedly to keep Yuga and his minions from escaping. After Link has rescued all of the Seven Sages and obtained the Triforce of Courage, Hilda lifts the barrier blocking the entrance, allowing the hero access to the castle's interior through the front door.

Themes and Navigation
By the time Link has gained the Triforce of Courage, Lorule Castle has been overrun by enemies who will attack Link on sight if he gets close enough. Lava fills much of the dungeon, making for a very perilous journey through the structure. Link must make use of Ravio's Bracelet in several instances to reach seemingly unreachable places. He must also manipulate light and darkness to see certain things that would otherwise be hidden to the eye. In some areas, Link must return orbs resembling eyeballs to their statues in order to open doors leading to the four sections of the castle. He must also make use of several of the items obtained from Ravio, such as the Hookshot, Bombs, Fire Rod, and Ice Rod in order to fully navigate the dungeon.

Akin to, within each of the four major sections of the castle, Link must fight a boss or mini-boss he has faced previously throughout his adventure. These four enemies respectively are: Arrghus, a Ball and Chain Trooper, a Gigabari, and a Moldorm. With the defeat of each of these enemies, an image of them lights up on the main door leading to the inner sanctums of the castle. Once all four of these enemies is defeated, the door leading to Princess Hilda's private office and the Throne Room of the castle opens.

Items
While there are many small keys in this dungeon, there is no Big Key as the way to the Throne Room is unlocked through defeating the four bosses mentioned above.

The main item of the dungeon, the Red Mail, is found on a ledge at the southern edge of the fourth floor of the main chamber, where Link must put out the torches in order to see two small pathways that can be walked to reach the ledge.

Trivia

 * Parts of Lorule Castle's theme contain reversed portions of Hyrule Castle's theme music. If most of the dungeon has been completed, Ganon's theme can also be heard.