.:Oblivion Keyblade:.

The Oblivion (Sugisarishi Omoide) [過ぎ去りし思い出]

The Oblivion is similar in shape to the Kingdom Key, but black and a longer reach.
The hilt guard is comprised of two bat-like wings extending downward.
The teeth are in the shape of the Kanji for "darkness" [闇].
The Keychain's token is a black version of Sora's crown necklace.
A chain-like design runs up the length of the blade.
The diamond in its hilt also resembles the diamond in the original logo of Hollow Bastion.
The Keyblade's name means a "state of forgetting or having forgotten" which is often associated with the memories that are passing away.