I have. 99 RDM/NIN vs Tunga with 500 enhancing magic for 150 Barstone + Barpetrify. He chainspelled Break / Breakga / Slowga / Stone IV onto me and I resisted every single spell. Every break was resisted, every slowga was resisted and Stone / Stonega did floored damage (crit resist).
Every character has a hidden "Magic Resist" skill that is capped whenever you level up, its "C" rank. It's used as the base for your magic evasion. Base Magic Resist + Elemental Resist is what determines a monsters resistance, not sure how the enfeeble resistances are calculated after that. We know they do a basic magic acc vs element check, but not sure if the enfeeble resistance is added onto it or not.
Also remember, "Duration" is a component of magic resistance. Magic res isn't like melee, its not a hit/miss calculation but instead is a series of sequential checks with each failure reducing the potency or duration by 1/2.
Ex:
Spell with 60s duration,
Check 1: Hit = 60s Duration (100% damage), miss = check again
Check 2: Hit = 30s Duration (50% damage), miss = check again
Check 3: Hit = 15s Duration (25% damage), Miss = check again
Check 4: Hit = 7.5s Duration (16% damage), Miss = Critical Failure (Resist Message, or floored damage)
Some spells are two checks, some three and theoretically some could be four.
So if barresist spells are lowering duration, then their really just forcing the monster to miss it's first few checks. This system also ensures that even at 50% magic accuracy, your rarely going to get a "resist!" message.


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