Corridors of Darkness
Corridors of Darkness are umpredictable pathways that interlink the worlds of the Kingdom Hearts universe. The Heartless use these extensively to reach other worlds, as do members of Organization XIII, its subordinate Nobodies, and many other characters. These pathways are formed out of Darkness, so it is unsafe for a normal person to travel them, because the constant use of these corridors would corrupt one's heart. However, the Heartless and the Nobodies don't have worry about this; since the Heartless already are corrupted hearts, and the Nobodies don't have hearts to corrupt.
Other characters who have used these corridors include Riku,Naminé, and DiZ. Of these, only Riku, Naminé and DiZ have been responsible for summoning the portals, and it has been suggested that one must have a strong heart to resist the overwhelming darkness which threatens the user of dark powers. It seems those who use the Corridors regularly gain a Black Cloak as a symbol of their ability to resist the corruption.
