One MP Cost is a recurring ability in the series. Though not named until Final Fantasy X, it has been around since Final Fantasy VI. The ability enables the user to use techniques and spells at the mere cost of 1 MP, and is usually obtained late in the game due to its potency.
Appearances
Final Fantasy VI
The ability is never named in-game, but it is the ability of the Celestriad relic (called Economizer in the original version).
A simple way to acquire a Celestriad that requires a little patience is to bet a Murakumo at Dragon's Neck Coliseum and fight the battle with Gogo giving him three Steal commands, a Safety Bit and a Brigand's Glove. With Gogo stealing from the Galypdes there is a 1/8 chance of stealing a Celestriad. The Murakumo yields a Holy Lance that can be bet to get the Murakumo back, for repeated attempts.
Celestriad can also be acquired as an item drop from the Brachiosaur.
Final Fantasy X
One MP Cost is an ability that can be found very rarely on dropped weapons, and can also be customized by using 20 Three Stars. It also appears on Yuna's and Lulu's fully powered Celestial Weapons, the Nirvana and the Onion Knight, respectively.
Final Fantasy X-2
One MP Cost is only available on the Font of Power Garment Grid after going through all the gates. Font of Power can be acquired in chapter 5 by completing the Fiend Colony dungeon on Mi'ihen Highroad; access the to colony is granted by dispatching a Lv5 chocobo to Mi'ihen.
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