I just tried again because people keep saying that. The final boss fight is okay as it is (IMHO), with the right strategy you can beat her in just about three minutes with only a few large potions and some dispel dusts for curing status ailments. Look some posts further down where I explained my strategy to someone else. You can even silence her with Eileen's final gale spell (Grohl's Fear or something like that) to prevent her from using any special attacks. In fact the fight is quite easy if you know what you're doing. Also don't forget to use your coin cards to permanently increase luck or temporarily boost it with a spell or equipment, as a high luck stat will make it much more unlikely to get stunned by the rocks.