Patlin said:
Does that only apply to spells, KB, or do you feel the same about spell like abilities? No one expects to be able to duplicate those anyway.
spells, definitly make me nervous, as there's no really good reason why the character couldn't research or learn the same spell. A spell like ability that introduces some totally new form of attack or defense would also get a long look from me - theres a certain amount of balance built into things, and if the spell like ability is out there, there should be a decent chance of a spell, class ability or other tool to be out there to counter or defend against it.
My way of looking at it is this. If rules for poisons didn't exist, and you invented them for a special ability of a creature the party faced, they would not have any of the poison related spells, antitoxins, the hope of higher level class abilities to help out, etc. A poison special ability introduced under those circumstances would be very powerful and somewhat unfair. I look at 'new' abilities thrown at the PCs in the same way - is this actually new in the world, and if not, why isn't it compensated for in the overall balance of the rules? If it is new in the world, why and where should it go from here? I would be wary of using the bad sci fi trick of introducing something new and powerful that conviniently cannot ever be harnessed by the PCs.
One thing I'm doing with Faerie Woods is using a magic location. Some of what happens there is a result of the location, and not of any inhabitant thereof. Fair game, or not?
I'm not familiar with the effects and of course, its not my place to say (and obviously the judges have been fine with it) but I would wonder, if that location has been there for some time, are there spells, items, uses of skills, feats, prcs, etc that have emerged to deal with its effects? Low level characters going there for the first time might not have those benefits, but if a higher level group has to deal with a different issue there, would they have any greater options?
Just things to think about. As orsal pointed out, this is supposed to be a cohesive, 'living' setting, and I think part of that is a reasonable understanding of what is in the world from one day to the next.