New plan when i get home tonight. If i chain Surianders in the Barheim Passage, i can aquire an Indigo Pendant. It allows status ailments to hit with 100% success by ignoring vitality. I can use this to maintain Reverse status thyroughout the battle. By doing that, although Sap, Poisen and Invert are still dangerous, the Foobars will become my healing machines. I can simply ignore them and focus on Cuchulainn.

Invert will still be a problem, but i'll gain levels as a result of chaining Surianders because they're a high level and the drop rate for the Indigo Pendant is only 1%