This is my point about the overpowered argument. There's always a way to design a mob so whatever is considered overpowered just won't work. Of course this puts us in the same boat as "Any enfeebles that matter are useless on any mob that matters"
Yeah I didn't think about chainspell either. But honestly - and I know it's going to sound like a giant cop out - but I have to admit I wouldn't really care. My personal hope for 91-99 as is far away from the 2006 Fafhogg tankathons as possible. They were fun in their day, but I see these last levels like those hours I put into FFIII US in 1994, beyond where the clock stopped recording at 99:59. Everyone was level 99 and I mowed down everything with Merton and 4 flame shields. I wouldn't have wanted to do this at any point along the trek to 99 but boy was it fun for a little while at the end.
At some point I'm hoping SE can salvage something out of the XIV wreckage. If they do I'd like to spend my last days in XI not worrying about balance and abuses, and just spamming Meteor, Ultima, Reviviscence, and a ridiculously overpowered enfeeble. I'd still like a bit of strategy and uniqueness though.
Along those lines, give SCH Merton and a short lasting Firestorm II that absorbs fire damage and I'd cry.