Originally this 11th level spell (I think in PRPG it was a spell of legend?) was on page 185 and it specified this:
- Savings Throw: Only an 18 to 20 saves
I had at the time figured this to be equivalent to "18 or higher" and assumed bonuses to save vs magic would help per usual. IE if I have +3 to save vs magic and roll a 15 then I resist the Anti-Magic Cloud.
Page 138 of Book of Magic however...
- Only a Natural (unmodified) 18, 19 or 20 saves against the cloud
This is a massive conceptual shift of how magic battles might operate on Rifts or in the Megaverse in general... it pretty much comes down to "who fires off the cloud first" if save bonuses do not apply.
It seems like you can't even have cloud v cloud duels since they "can not be dispelled magically", being a rare (sole?) exception to it's effect of "negates all magic" and "casters can not use magic"...
Rune weapons being the one exception to magic weapons being negated probably explains why gods would horde such things...
This makes me wonder about non-magical countermeasures though...
Nega-Psychics and Psi-Nullifiers for example seem like they could be massive tiebreakers since they probably COULD dispel anti-magic clouds since they don't fall under a "dispelled magically" countermeasure.
Other means might be using psi or super powers to mind-control the mage who created it and get them to cancel it... though I don't know if that's possible if they're also a Diabolist and permanence-ward it.
Seems like any gods/demon lords who know this spell and happen to be Diabolists should be expected to have anti-magic clouds active in all their lairs as a countermeasure. If they have reason to need someone other than themselves use magic they could move to an area which allows it.
One thing I'm not totally clear on about this spell though: the "range" is described as a "radius" which I assume means from the caster... but does that radius follow them around (cloud moves) or would the center of the circle be fixed in the position the mage cast it and the mage can then venture outside of the circle?