Ether is used to cast elemental spells through Gems, read Scrolls, and heal. A certain quantity of maximum ether is given by some Job classes, and usually increases by one every time the character levels up. It can also be increased by certain consumable items such as the Manafont, or artifacts such as the Sedge Hat.
Usually one point of ether is deducted on the successful casting of a spell or heal, or an attempt to read a scroll, regardless of the success of the attempt. Once ether has been consumed, it can be restored by consumable items such as Tonics, a roll of Meditate, or by resting in a bedroll. Ether is also fully restored when a character returns to the Hall between quests.