As we were wandering around looking for the NM for the Rdm AF1 quest, we accidentaly aggroed this guy. It wasn't until about halfway through we realized that they were one and the same -_-
Anyways, party was 59Blm, 55Blm, 52Whm(me) and 42Rdm.
He doesn't hit too hard, but he casts a lot of level II spells and -ga spells. None of us could silence him, even with Elemental Seal. So it must take a very high enfeebling skill to do so.
He's got lots of HP so be ready for a long fight. I'd say it's doable by a well balanced party of 40-41 at the minimum.