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Undo is an Overclock ability that appears in Kingdom Hearts Re:coded. The ability nullifies all negative status effects. This ability eliminates the need for all rings that nullify a certain status effect. Although it is only a level 2 or 1 Ovcerclock, it is considered one of the most powerful abilities in the entire game by most fans.
Undo is a level 1 Overclock ability for the Oathkeeper Keychain.
Undo is a level 2 Overclock ability for the Three Wishes Keychain.
Undo is a level 2 Overclock ability for the Ultima Weapon Keychain.
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