Ether

An Ether (エーテル) is an item that restores 3 MP or magic points in Kingdom Hearts. However, in Kingdom Hearts II it fully restores MP (if there is some left in the bar) or it can be used to reduce the MP Charge Gauge. In Kingdom Hearts Chain of Memories and Re:Chain of Memories, an Ether card quickly reloads all magic cards.

In Kingdom Hearts 358/2 Days, it's in form of an item panel which restores one cast of each magic you've installed.