Castle That Never Was

The Castle That Never Was is an exclusive world to Kingdom Hearts 2. This was the headquarters of Organization 13. However, the only nobodies from the Organization remaining are Roxas, Xemnas (as seen in Kingdom Hearts 3), and possibly Axel (he is considered Reno's - a character from the Final Fantasy 7 series - Nobody, and is a friend and memory of Sora, Roxas, Kairi, and Namine, which could possibly resurrect him later on). Playable characters in the area are Sora and Riku (actually played in the Kingdom Hearts world connected to the Castle). Of the several boss nobodies in the game, the only ones combatible in the Castle are as follows:

-Saix

-Xemnas

-Luxord

-Xigbar

In the Castle, there is a graveyard for nobodies that featured portals to their domains, weapon discriptions, and given titles (aka, Axel, the Flurry of Dancing Flames). It appears as though Zexion's trademark is scratched out, as his fighting technique did not appear in KH: Chain of Memories. This would be a suggestive thing to do since his power is to replicate/multiply himself and copy his enemy's weapon, which was done with Riku in Re: Chain of Memories. (This information was found at the official KHUltimaia fansite.)