I will have to order this as no one in or around Dallas is carrying it...
But I think the CR of the Demons/Devils sounds about right. I would hold off final judgement until I see their actual abilites, but that puts them out of the range of your standard party to directly assault them, but the party would have the ability to challenge their minions and to thwart their plans.
Everyone likes different levels to play at, (my personal favorite is 10-15th level) but even with high level non-epic this is going to be a challenge rating that is beyond a party (the 20's may be an exception). But if you are in epic levels, you should be slaying demon princes, I mean what else is there to do?
But I think the CR of the Demons/Devils sounds about right. I would hold off final judgement until I see their actual abilites, but that puts them out of the range of your standard party to directly assault them, but the party would have the ability to challenge their minions and to thwart their plans.
Everyone likes different levels to play at, (my personal favorite is 10-15th level) but even with high level non-epic this is going to be a challenge rating that is beyond a party (the 20's may be an exception). But if you are in epic levels, you should be slaying demon princes, I mean what else is there to do?