Keyblade

are mysterious weapons like sword, had the ability to open and close any worldly dimension passage through a special keyhole that appear when only the blade is reacted by glowing. The Keyblade is also a main part of the battle between Darkness and Light.

The Keyblade has a special power that only lets a chosen wielder hold it. This is proven when Sora gives his Keyblade to Jack Sparrow, only to have it come back to his hand. In the final battle with Xemnas, Sora was able to hold Riku's Keyblade, and the same goes for Riku with Sora's Keyblade.

While there are many qualities a Keyblade wielder must have in order to harness the Keyblade's power, the main requirement is for one to have an exceptionally strong heart.

It is implied that it is possible for a Keyblade Master to choose a person as their successor if they have the main qualities that allow them to hold a Keyblade, as Terra chose Riku to be his successor. Kairi inherited the same ability when she accidentally touched Aqua's Keyblade.

The origins of the Keyblades is, thus far, unclear. Each references the special qualities of the wielders and some give vague explanations of the Keyblades' power, but none have shown where the Keyblades originated, how they are created, or what their original purpose might have been. One legend states that the Keyblade master saved the world, while another said he wrought chaos and destruction upon it.

While these legends may appear to contradict themselves, it can be assumed that the Keyblade master chooses how to use the Keyblade, whether for good or evil. The Keyblade is known throughout the worlds as a unique and powerful weapon. In Atlantica, King Triton and Ursula both knew of the Keyblade and its powers. King Triton did not want Sora to seal the Keyhole because he thought that the Keyblade would send his world into chaos, while Ursula knew that it gave the ability for the one who wields it to travel around the worlds.

It should be noted that none of these seemingly abandoned Keyblades, nor those of protagonists Aqua, Terra, or Ventus, have Keychains, although the significance of this detail is currently unknown as the history of the Keyblades is unknown and the trio have been shown later to have Keychains attached to their Keyblades in. Master Xehanort also stated that the thousands of Keyblades left are the ruins of the Keyblade War.