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Vicious Love said:
I'd imagine penetration makes a difference, simply because it seems to do so in each and every other spell involving an MR roll, be it direct, area effect, total area, or overland...

Hmm. Wonder if globals such as Lure of the Deep are affected.

I suppose so : once I was affected by an Atlantis-IA LotD and I lost troops and leaders, but the prophet that was there was unaffected - it lasted some turns then I dispelled it.