Oblivion

The Oblivion is a Keyblade in Kingdom Hearts, gained by opening a chest located in the room where Riku was fought while possessed by Xehanort's Heartless. The player doesn't get a chance to open it until after the fight. One of the strongest mêlée-oriented Keyblade in the game. Oblivion reappears in Kingdom Hearts II, as both a key chain for Sora after his reunion with Riku, and as one half of Roxas' dual set of Keyblades, the other being Oathkeeper. It can be seen as a Keyblade of darkness, to balance out the light of Oathkeeper. Also, the name is reminiscent of Castle Oblivion, and the design of the shaft looks like an Organization XIII robe.

Appearance
In shape, the Oblivion is similar in shape to the Kingdom Key, Oblivion is deep black and has a longer reach. The hilt guard are two bat-like wings extending down. The keychain motif is a black version of Sora's crown necklace.

Tips
In using this keyblade, you can easily level up your Drive Gauge. It can also increase its effect in depleting your MP due to MP Charge