Okay, so apparently this spell doesn't do any major damage until you have the person who has it max out all of their spell stats to 16. Have any of you done this in order to have something effective against the final boss? I wouldn't mind making Ultima 16... but then I realized I need to max out all the rest of her (Maria's) spells. Do I even need Ultima?

If there was another thread about this you can just link me and lock this one but I couldn't find one.