MP Attack (MP消費攻撃, MP Shōhi Kōgeki?, lit. "MP Consumption Attack"), or Charged Attacks, is a recurring ability that is found mostly on pieces of equipment throughout the series. It involves using MP to increase the user's physical damage output when attacking physically.
Found exclusively on the Rune Edge, Rune Chime, and Rune Axe weapons. The Rune Edge can be found in Istory Falls, or stolen from Stingrays. Rune Axe is one of the 12 sealed weapons. The Rune Chime must be won from Baldanders in the Ruins section of the Interdimensional Rift.
Certain weapons, namely the Rune Edge, Organyx, Ragnarok, Lightbringer, and the Punisher consume a random amount of MP from the wielder to inflict a critical hit 100% of the time. Organyx can only be equipped by Terra, Edgar, and Celes, and can only be morphed or won from the Coliseum. Punisher can only be equipped by Strago, Relm, and Gogo. It can either be won from the Coliseum by betting a Gravity Rod, or found in the Ancient Castle. The Punisher is also Banon's weapon, but it can't be unequipped and he cannot perform critical hits with it due to not having MP.
MP Attack is an ability that can be learned by Zidane, Steiner, Freya, and Amarant. With MP Attack equipped, each attack will use 15 MP to deal 1.5 times the normal damage. It is learned from Red Hat, Cross Helm, Battle Boots, and Power Belt. Mastering this ability requires 45 AP for Zidane, 50 AP for Steiner, 20 AP for Freya, and 60 AP for Amarant. Five Magic Stones are required to equip the ability.
Charged Attacks is a passive ability learned from the Supernal Ray weapon. It is only learnable by the moogle-specific Flintlock class and increases the attack power of regular attacks by 10% at the cost of 10 MP.