The entryway into this place of great power is the Door to Darkness, the door that separates the realm of light and the realm of darkness. And because of this, Heartless seek immense darkness, enough to completely consume the Realm of Light. Heartless, as they seek and consume hearts, desire to return to the greatest heart, the heart of all worlds, Kingdom Hearts, that resides deep within the Realm of Darkness. 3.8 Kingdom Hearts 3D: Dream Drop Distance.3.2 Between Kingdom Hearts Birth by Sleep and Kingdom Hearts.
