Firaga III is my favorite, but in general I think aga nukes are a waste in XI. I don't know what SE was thinking. We don't EXP on hoards like in past FF's - when a blm's specialty was hitting all 2-9 mobs at once. Farming with aga spells (and maybe AOE in general) was nerfed by SE long ago. What's left? A quite MP inefficient nuke for MB only when the coast is clear? Tier IV single targets and AM II all the way. I don't use agas anymore.