The keyblade Oblivion is seen in many of the Kingdom Hearts games. In Kingdom Hearts 358/2 Days, Oblivion along with Oathkeeper are dual wielded by Roxas. It transformed from the second Kingdom Key after absorbing Xion, a member of Organization XIII. Oblivion symbolizes the memories Sora has of Riku.
Oblivion's design is similar to that of the Kingdom key, but has a longer reach. The teeth at the end of the blade are in the shape of the Kanji for "darkness" and the hilt guard are two bat-like wings stretch downward.