
Mega-Ether in Final Fantasy X-2.
Mega-Ether (メガエーテル, Mega Ēteru?) is a recurring item in the series. It generally restores 50% Max MP to the party.
Appearances
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Final Fantasy X-2
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While not appearing as an item, the Mega-Ether is one of the results of the Lady Luck's Item Reels command by lining up two Cherries and any other icon. It restores 50% Max MP to the party.
Final Fantasy XIV
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Final Fantasy Type-0
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Mega-Ether is an item that restores 50% Max MP to the party.

World of Final Fantasy
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Non-Final Fantasy appearances
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Kingdom Hearts
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Mega-Ether is an restorative item. In Kingdom Hearts, it restores three MP gauges to each party member when used. In Kingdom Hearts II, it fully restores the entire party's MP. In Kingdom Hearts 358/2 Days, it restores one cast to each of the player's magics in the same map.

Etymology
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Mega is a unit prefix in the metric system denoting a factor of one million (106 or 1,000,000). It has the symbol M.
Diethyl ether was once used in pharmaceuticals. A mixture of alcohol and ether was known as "Spirit of ether" or Hoffman's Drops. In the United States, it was removed from Pharmacopeia prior to June 1917.