by Kale » Tue Nov 09, 2010 12:20 am
Make sure to cure any negative status effects on Marion, particularly fatigue. A status effect that lowers her AT stat may be the issue here.
I've been led to believe by other posts on this subject that the door may not be entirely dependent on Marion's AT stat. I don't have a save file to really experiment on this, but try to raise the AT stat of every member in your party and see if that helps. Equip their highest AT weapons, and boost it with "Weapon Boost" (+25%AT, 'Silver powder' item) and "Legend Slayer" (+20%AT, Random's 'Hero' skill)
See if any of that works for you.