Diamond Dust

The Diamond Dust (ダイヤモンドダスト) is a keychain which Sora obtains after defeating the Ice Titan in the Gold Match. This Keyblade is a Kingdom Hearts: Final Mix exclusive along with the One Winged Angel Keyblade. It is also a weapon in Kingdom Hearts: Chain of Memories. You receive it by opening a treasure chest in a Calm Bounty room in Castle Oblivion after defeating Marluxia. The Keyblade appears to be made of ice, and the teeth and Keychain are snowflakes. It bears some resemblance to the Oathkeeper Keyblade.

It shares the same name as the attack of the summon Shiva from the Final Fantasy series and an attack that Vexen uses in Kingdom Hearts: Chain of Memories that also serves as his Limit Break in Kingdom Hearts: 358/2 Days.