Keyblade

The Keyblades are weapons that are manifested light or darkness. These Key shaped weapons are wielded by those chosen to do so, either by the weapon or by transferal ceremony. These can be used to unlock any lock. These weapons are the only tools that can be used to release hearts that have been consumed by Heartless, and they can also be used to release hearts from people in some cases. The type of Keychain attached to them determines their shapes and abilities. These tools have appeared in every game throughout the series and the weapons are mostly unique for each person. Exceptions lie with Roxas and Xion, who both wield the Kingdom Key as their standard Keyblades due to their connection with Sora.