Aerouge is a fiend in Final Fantasy X, encountered in the Thunder Plains. It will attack with a Thundara spell every turn until defeated. It can be silenced to avoid its spells, but unless underleveled, Wakka should be able to kill it with one attack.
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The Aerouge appears in numerous Final Fantasy X dungeons. It can use both a physical attack and Thundara, dealing lightning-elemental damage to one party member.