With most illusions you don't get a disbelieve save unless you interact with it. I always assumed every time someone interacted with an illusion you got a disbelieve will save. But I read on a recent thread that this was a matter for debate. In any case, I'd still agree that with normal illusions (entirely make-believe) every time someone attacks/interacts they should probably get a will save to disbelieve.
However, what about shadow conjuration or shadow evocation spells that demand constant interaction? Do you get a will save every round? I play an illusionist in my current game and I was initially fine with this (it was me who informed our GM how it worked), but upon experiencing it... I find myself wondering is this is truly the intention of quasi-real shadow stuff spells. It seems a little harsh. It makes some spells nearly useless.
For example, you cast Shadow Resilient Sphere on someone. It's already costing you a 5th level spell to get a 4th level spell, throw spell resistance on top of that (though in this case that's already there), and a will save to disbelieve when it's cast on you. But you get great utility out of shadow spells so that fine. But the spell lasts minutes per level and surely you can say you're constantly interacting with it. Do you really get a save every round? That makes the shadow version of this spell and any non-instantaneous duration spell a lot less useful (to put it politely).
Do people think these shadow spells were intended to give only one disbelieve roll and then no further until the duration runs out or someone else tells them it's not fully real to give them one more at a +4?
For normal illusions I don't mind the one save per interaction. But in the case of these quasi-real spells where you already make so many concessions to get that flexibility, will saves every round during the spells duration seems too much and I think I might start nit picking at the exact wording of the RaW to make a case for this with my GM.
Feelings, Thoughts?