World of Chaos

The World of Chaos is the name of the true final boss in Kingdom Hearts.

The World of Chaos is a giant, biological Heartless battleship that Ansem bonded himself to as his final form. Capturing Donald and Goofy, Sora was forced to fight Ansem on his own until he retracted into his Guardian. But after getting his friends out and destroying the Core, Ansem reawakened to fight the three off before they did enough damage to destroy the World of Chaos and forced Ansem to separate himself from it, leaving him mortally weakened as a result. During the battle with it Ansem wielded a large double-bladed Soul Eater pole arm. He could also shoot lasers from virtually anywhere in the room, as well as the ability to throw Bit Snipers (Final Mix) or call on Bit Snipers at any time (Kingdom Hearts). His ultimate attack consists of blowing Sora away and connects by firing countless destructive lasers tracking Sora.

Face
Main Article: Face

The face is at front of the World of Chaos. It is fought after you are reunited with Goofy. Once you defeat the Face, you must enter its mouth to fight another Room Core and be reunited with Donald. The fight with the Face is not hard at all, just keep attacking it.

Main Core
The Main Core is the "heart" of the World of Chaos It is reached when you have been reunited with Donald and Goofy after the fight with Xehanort's Heartless the first time around. There isn't really much of a strategy to this fight, all you really need to do is whack at the heart and block the lasers coming from the tentacles shooting lasers or destroy the defenses. It looks like some sort of a face of a cat(or something like that) and it somewhat sort of shaped like a "blob" and it moves when you hit it.

Room Core
There are three room cores. One is by yourself and the other two are with your allies. These are only able to be attacked by destroying all the Heartless in the room. No matter how high your strenghth is, you can destroy it using one combo, on of three hits.

Battle Quotes
"Turn to Darkness!" "Welcome the Darkness in your Heart." "All shall be extinguished." "Still confused? Then perhaps this will enlighten you." "Come forth!" "Weak ones, witness real power!" "Come...Darkness!" "Is this the answer? It cannot be!"

Trivia

 * World of Chaos may be the Heartless of the Dragoon Ship (Inexistent World), the final boss of Kingdom Hearts II.