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2 Grilik:
What???? How can tactics depend on the difficulty level??? That's a stretch...
And about the ifrits, could you learn Armageddon in the first week (expert wisdom, guild level 4...)? - you should have based your argument on that. But even in this example, what prevents you from doing it a little later?
Sufficient wisdom and advanced wisdom are enough, unless you're dealing with the ultimate Armageddon.