Nifft said:I'd honestly prefer something like ER 5/fire (more like DR, where you need the specific energy type to deal full damage).
Thus a weak devil might have ER 5/acid or electricity; a strong devil might have ER 15/acid.
This is mostly how I'd like to see Energy Resistance dealt with - as a form of Damage Resistance. I think that's a great way to model it - keeping the mechanic consistent with DR makes one less thing to worry about in the midst of combat. I'd also like to get rid of "immunity" altogether if I could, though I'm still not certain that I like the idea of a fire elemental taking damage from a fire spell of ANY caster. I've toyed with doing this in my games for a few years, but I've never had the time to take the plunge to see how much it might impact the Challenge Rating of particular monsters, or if I might need to bump up some Hit Dice to make up for the changes.