End of the World

End of the World is a World from Kingdom Hearts. It is the last new location to open in the game, upon locking Hollow Bastion.

Arguably the most sinister and ominous area in the series, End of the World is a by-product of the Heartless' destructive nature. Upon taking a world's heart, a tiny fragment of what is left of that world is sent drifting through the void of space until it eventually meets and merges with End of the World. It is, in essence, a Heartless of the destroyed worlds, as well as the location of Kingdom Hearts for worlds' hearts. In nature, it can be seen as the opposite of The World That Never Was, which is a similar artificial "Nobody" world without its own heart.

The theme music for End of the World is "End of the World" and the battle theme is "Fragments of Sorrow". Both are reminiscent of "Dive Into the Heart (Destati)", the music used in the Awakening.

Setting
End of the World opens on the Gate to the Dark, a sea of darkness in the process of collapsing. Along the snowy fragments of landscape are a few battles against Behemoths (turned into Arch Behemoths in Kingdom Hearts: Final Mix) and other high-level Heartless. Following the empty void is a colorful, quiet canyon that is called the Giant Crevasse that spans several levels connected by green web-like formations. At the bottom of the canyon is a passage to the fragmented World Terminus, which in turns leads to the Evil Grounds and a boss battle with Chernabog.

After defeating Chernabog, the top of Bald Mountain opens, allowing Sora and his party to descend through the Volcanic Crater. This leads to the bottom of the mountain, where a hard and well-fought journey through the Linked Worlds room leads to the Final Rest, where the final save point of the game is, as well as The Door, first seen in the Awakening, that leads to the final confrontations of the game. It should be noted that Atlantica, Olympus Coliseum or even Monstro doesn't have to be completed in order to access this world.

Story of Kingdom Hearts
After locking all of the worlds' Keyholes, Sora, Donald, and Goofy travel to the End of the World for their final confrontation with Ansem, a chance at rescuing Riku, and perhaps even a chance to find King Mickey.

Trivia

 * If you look at the wall in the second part of the path to the Mixed Worlds section, you can see what looks like part of the forest in Enchanted Dominon, which is Aurora's world.