What is the real reason why the Heartless are afraid of the Keyblade, what secrets does the weapon truly possess? The keyblade might have a connection with these demons, the denizens of the dark world. Far Worse than any enemy that the keyblade wielders encountered and much worse than the unversed. They are merciless, aggressive, and brutal along with their king. And what's worse, they're completely immune to the keyblade. Why? No one knows.