The ritual to summon Alexander was... complex. It required two summoners, a specific prayer, and an extraordinarily specific jewel. Alexander was only to be summoned as a last resort, to be used against a foe that was insurmountable, for there were no Eidolons which could equal him. Bahamut could lay ruin to an entire city in minutes, if a summoner could sustain him long enough.
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Bahamut could lay ruin to an entire city in minutes, if a summoner could sustain him long enough.
Alexander could do it in mere seconds.