Delta Attack (ability)

Delta Attack is a powerful recurring attack, which requires the presence of all three users.

Final Fantasy IV
The Magus Sisters are able to use Delta Attack, wherein Mindy casts an offence spell on Cindy, which will bounce off and hit the player's party, because Mindy will have cast Wall (Reflect) on Cindy beforehand.

Final Fantasy V
Phobos, Nereid and Triton, three of Exdeath's lackeys, will use Delta Attack when one of them is defeated, but revives itself before the player has a chance of killing one of the others. It inflicts low to mediocre damage to one character, but has a possibility of Petrifying that character.

Final Fantasy VI
The Three Dream Stooges, Larry, Curley and Moe are able to use Delta Hit, renamed Delta Attack in the Advance Version. It has a possibility of Petrifying the character it hits.

Final Fantasy X
Delta Attack, which is the Overdrive of the Magus Sisters, is argueably the strongest Aeon Overdrive in the game. It ignores defense, breaks the Max Damage Limit and in the International version, it deals 8 attacks rather than just 1.