Thanee said:
Well, let's say I have a hard time to figure how something could bounce off something that isn't there (and isn't perceivable as well).
If the shadow spell would change the mental perception of the opponent, yeah, then I could see it work like that. But otherwise, it just creates an invisible armor, which doesn't stop attacks. That's hardly something that would change the way the opponent is attacking.
Illusions produce sensory feedback.
Stand near a wall.
Close your eyes.
Punch at the wall, but be careful about it.
Now - which of the following happens:
a) You break your hand and arm because you didn't feel the wall
b) You reflexively stop the motion of your hand when it hurts.
Voila - how mage armour works when you don't disbelieve it.
Sorry, but to me, the stuff stated in the spell description simply does not cover those spells. It's only applicable to summon monster type spells.
If you really, really believe that to be true, then I cannot help you. You have wandered far from the realms of the actual rules.
The rules say:
A shadow creature has one-fifth the hit points of a normal creature of its kind (regardless of whether it’s recognized as shadowy). It deals normal damage and has all normal abilities and weaknesses. Against a creature that recognizes it as a shadow creature, however, the shadow creature’s damage is one-fifth (20%) normal, and all special abilities that do not deal lethal damage are only 20% likely to work. (Roll for each use and each affected character separately.) Furthermore, the shadow creature’s AC bonuses are one-fifth as large.
Note specifically what this applies to - a shadow creature. Not a creature summoned by a shadow 'summon monster' spell, not an animal, not a humanoid.
ANY SHADOW CREATURE.
Mount summons a horse.
Hell, even phantom steed states that it summons a
"horselike creature"
The rules are clear.
The big problem is, that the shadow brand of illusions is not really explained. It only states what the shadowy portion does (and what it does, if someone is fooled by the illusion). But it doesn't state at all, what kind of illusion it actually is and how the illusionary portion really works (like figment or like pattern or like phantasm?).
The rules are clear. They are partially real. Unless disbelieved, they function how the individual spell states. The individual spells cover what they do quite well, perhaps with exceptions like mage armour (ie - is it a +1 ac if disbelieved or a +4 20% of the time?)
The problems you see are simply not there. I disbelieve them.