Gummi Blocks are pieces of these broken barriers. However, the arrival of the Heartless caused the barriers between the worlds to crumble and disappear, and some worlds were consumed by the eldritch horde. Prior to the release of the Heartless, the worlds were surrounded by barriers to prevent outside interference, making it impossible for different worlds to have contact. During the reboot, Heartless run rampant and have to be slain by Keyblade wielder to prepare the world for the inhabitants' return.

Kingdom Hearts (game) Kingdom Hearts Birth by Sleep Kingdom Hearts 3D: Dream Drop DistanceĮach world that was recreated following the Keyblade War has its own time flow, but as a result, their rebooting is left at random paces. The remaining Keyblade wielders resolved to protect the World from further destruction, becoming guardians of the world order. The remnants of the battlefield on which the Keyblade War took place became the Keyblade Graveyard, a scarred wasteland filled with the Keyblades of fallen warriors. However, the world was restored by the light within the hearts of children, as many individual worlds separated from each other. In the end, darkness covered the World, the χ-blade was shattered into twenty pieces, seven of light and thirteen of darkness, and the 'true' Kingdom Hearts disappeared into the darkness. This event became known as the Keyblade War.

In order to take control of Kingdom Hearts, many people forged Keyblades in the image of the χ-blade, and they clashed together in a far-reaching conflict that embroiled the entire World. Over time, people came to desire the power of Kingdom Hearts, introducing darkness into the World. In the 'age of fairy tales', the world was whole and full of light, which was believed to come from Kingdom Hearts, which was protected by its counterpart, the χ-blade. Legend has it that long ago, there was one single world that was constantly bathed in the warmth of the light of Kingdom Hearts.

World of darkness timeline