The ONLY thing it should erase is the buffs, no progress at all, the progress erasing is what makes me want to forget doing it & trying for the stupid Fast Cast neck, 5% Fast Cast on a neck is nice, but not worth 1 fight every 25 days for a CHANCE to get it, I might lose the fight, or it might not drop, or someone might out lot me, in any of these 3 cases, I have to wait basically another month to attempt, no. If anything, make us need KIs for the final boss of it still, but keep progress upto the bosses once you get to them, so it only takes 6 days for you to do the final boss again.