Really newbish battlefield spell question

[Taqwus]

Also might be noted that stacking resistances isn't nearly as powerful as, say, in Dom 2 (in particular, resistances from wide-area spells don't stack with each other, IIRC), making units with intrinsic partial resistances (ex. EA TC W5E, C'tis units with 50% PR, the High Caelian units with 50% SR, etc) that much more valuable. 100% total immunity after boosting is far, far better than 50% resistance after boosting...