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let's say a wizard want to launch an "acid arrow" to someone inside a room.
our wizard is not aware that there is a closed ad invisible door between them.
a/ spell requires Line of effect to be cast.
b/ there is no line of effect here
what happens to the spell ?
1/ not cast ? (not removed from caster's spool/memory)
2/ cast and lost (fizzling in mid air)
3/ cast and hitting door, causing it damages
in case of 3/ what would happen if magic missile was cast (it can target creature only)
Acid Arrow does not have a "Target: " listed in the spell. You cast it without any target, since what it's doing is bringing something (the dollop of acid) into being. Once the acid exists, the magic speeds it to wherever your hand is pointing. However, you can't hit your intended target in this case because of the intervening invisible door (a whole 'nother subject). There aren't any rules for acid arrow that say you have to account for where misses go, but the GM can if (s)he wishes.
I would rule that the door is hit.
Magic Missile is different. It does have a "Target: " listed, "up to five creatures, no two of which can be more than 15 ft. apart". You can see the target, but you have no line of effect (unless the door has a hole of at least 1 square foot, see page 215).
I would rule that the spell fails per page 208, but I'd also give the caster a save vs the invisibility illusion (for interacting with it).
If there is a closed door between the caster and the intended target then a spell like Acid Arrow that has an effect of producing an arrow or a ray spell would just hit the door. If it was a targeted spell like a Charm Person or a Magic Missile then I would assume it would not even be able to be cast as there is no target.
If I understand this, the door is invisible and there is some type of illusion showing what is going on in the room behind it and even creating the image of the bad guy in the room for you to try and target. Is that correct?
Or have you or the DM ruled that if the door is invisible, then everything behind it becomes visible and so you are trying to target the bad guy that way?
Either way you judge it, there is no line of effect and so the spell cannot affect the bad guy. I think it depends on the type of spell. If it were the Acid Arrow that you mention, then I would rule the was spell cast and gone from memory. Of course, I would give the door acid damage and you would probably have some idea that something is wrong with the scene in front of you.
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the rule was: invisible door + lit room with humanoid standing inside = visible humanoid from outside the room. (no additional illusions)
so we'll go for if spells requires to hit roll: then spell is cast,door takes the damage and caster is obvious of something blocking.
if spell is "target : ..." then spell is cast, lost without effect.
I won't roll for ST vs illusion, as invisibility does not grant such ST.
I'd go for a spellcraft (Knowledge-Arcana) to estimate the reasons why the spell failed.
thanks guys !