MP, which can stand for Magic Points, Magick Points, Mana Points, or Mist Points, are required to cast spells. If the MP cost of a spell is greater than your remaining MP, you cannot cast that spell. MP slowly regenerates over time in and out of combat. MP can be regenerated by using items such as Ethers. The MP cap for all levels is 10,000.
Various items, such as Ether and resting with a Tent or at an Inn, will restore MP.
Ether restores a small amount of MP to one character.
As the example shown below, the Ether restores 800 MP. Processed via the alchemical extraction of aetheric essence occurring in elemental crystals, the contents of this vial instantly restore a small amount of MP.
You can purchase Potion from shop. The following is an example. Choose "Purchase items", then select number and buy. The price of Ether is 60 Gil.