As I've been trying to defeat Cuchulainn as early as possible it occured to me that he caused a status ailment I couldn't block: Sap. This was despite the fact that I tried once to equip Quasimodo Boots, which are supposed to block the effects of Sap.
My question is: Is it fair to have a boss be able to ignore status effect blocking equipment/spells?
My contention is if they want a boss that has effects you can't block, make the party fight them before the means to block them is available. Of course that would be hard to do with an optional boss, unless it dropped said equipment.