The Oblivion is a Keychain for Sora’s Keyblade which appears in Kingdom Hearts, Kingdom Hearts: Chain of Memories, Kingdom Hearts II, and Kingdom Hearts 358/2 Days. In Kingdom Hearts 358/2 Days, it can be upgraded to the Oblivion+. It also appears as half of Roxas‘s dual set of Keyblades alongside the Oathkeeper, and was transformed from the second Kingdom Key Roxas obtained after absorbing Xion. Fundamentally, the Oblivion is symbolic of Sora’s memories of Riku.
Oblivion is similar in shape to the Kingdom Key, though is deep black and has 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. When the Oblivion is summoned in Kingdom Hearts II, black smoke and violet sparks surround it.
The Keyblade’s name means a “state of forgetting or having forgotten”, and its Japanese name has the same basic meaning. The Oblivion is often associated with the memories that are passing away, such as when Sora reaches the last floors of Castle Oblivion, or when Roxas begins forgetting Xion following her destruction.