What guidance is there as to how these work together? If there is no clear cut, is this something worth trying to get a FAQ on?
As I'm reading over them, RAW seems to indicate Immunity to Illusion would just make you immune to Shadow Evocation/Conjuration effects, they're Illusion spells, reading the rules for Immunity, too bad so sad.
However by decription, the RAI would seem to be Immunity to Illusion, when applied to Shadow spells which are 'quasi-real' and thus not full illusions like other illusion spells, should work like an auto-save on the Will check, so the illusion part of the spell fails, but the quasi-real gets through (as it didn't require belief and wasn't by description an illusion, but was actually present)
I know Shadow spells can be a can of worms on the forums here, I was just curious if there was any guidance from on high on this issue [either Devs or PFS rulings], and wanted to get some general feedback on it (from people with the books handy or with better access to the online rules than I have at the moment). Any guidance on this anyone wants to give would be appreciated.
I don't know if there's been a ruling, but I'd probably run it as an auto-save and thus only affected by whichever percentage of the spell is real.
What has "Immunity to illusions"?
Duergar are immune to phantasms, but not all ilusions.
Taiga Giant in RotRL module has immunity to all illusions though.http://www.d20pfsrd.com/extras/collaborators/fan-bestiary/taiga-giant
Defensive Abilities Rock Catching; Immune enchantment and illusion spells (see Spirit Summoning)
Once per day, a taiga giant can perform a 10 minute ritual to summon ancestral spirits to aid it in battle. These invisible spirits grant the giant a +2 deflection bonus to Armor Class, immunity to enchantment and illusion spells, and one of the following spell effects: bless, endure elements, protection from evil, protection from good, or see invisibility. These spell effects last for an entire day (regardless of their normal duration)
Only way to remove: Successfully turning or rebuking these spirits banishes them for the remainder of the day,
If "Immunity to Illusions" means "Spell Immunity to spells from the Illusion school" (which, in the case pf the Taiga Giant, it appears it does), then it means the creature has unbeatable SR against all spells in the Illusion school, including those with the [Shadow] descriptor.
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I would treat it as always making its save against the illusion. Shadow spells are partially real the real part could do damage. But all the save or fail spells just fail. Things like invisibility don’t affect the creature that is immune unless they are cast directly on it. In which case they would auto fail too.