(Please note that quotes are rearranged to better fit the flow of my post.)
Scion said:
It doesnt matter if the character in question can see through the shadows as though they werent there for any reason (be it darkvision, true seeing, or anything else). All that matters is that they are there and the shadowdancer is close enough.
You obviously feel strongly about it not working, but there is nothing in any of the things in question to make it unuseable. Hide in plain sight simply changes when the character can use the hide skill, that is all. It doesnt matter if the person can see those shadows or not.
As I have mentioned, being able to see through shadows is irrelevant to whether Hide in Plain Sight works. I only brought up magical
darkness as an analogy. Shall we agree not discuss this point further, as it is only confusing the issue?
Hide in plain sight modifies when someone can use hide. True sight does nothing about that. Hide trumps true sight. Therefore, true sight does nothing here.
It doesnt matter that the hide in plain sight ability is supernatural, that is irrelavant. Why should it matter? A magical item that gives a boost to hide checks is also magical, and yet why would true sight cancel these out?
This is the crux of the matter. The Shadowdancer's Hide in Plain Sight ability allows him to make a Hide check when he is otherwise not able to, but it is magical in nature. The question is how it interacts with
true seeing.
The description of
true seeing gives a laundry list of effects that it sees through: normal and magical darkness, secret doors hidden by magic, the locations of creatures and objects under
blur or
displacement effects, invisible creatures, illusions, the true form of polymorphed, changed or transmuted things. It appears to me that apart from normal darkness, the unifying characteristic of these effects is that they are magical in nature.
The spell description also gives a list of things it does not work against: it does not see through solid objects, does not negate concealment (though presumably, being able to see through darkness negates concealment from darkness), does not see through mundane disguises, spot creatures that are simply hiding, or secret doors hidden by mundane means. The unifying characteristic of these effects appears to be that they are non-magical in nature. As a case in point,
true seeing detects secret doors hidden by magic, but not those hidden by mundane means.
While it is not explicitly stated that
true seeing sees through all magical means that conceal, disguise or hide creatures and objects, it is certainly implied by the way the spell is written. As such, since the Shadowdancer's Hide in Plain Sight ability is magical in nature, I would rule that
true seeing works against it.
As to why
true seeing does not work against magical items that give a boost to Hide checks, it is because these items are not directly hiding the character, but are enhancing his own ability to hide. Flavor text notwithstanding,
shadow armor and
cloaks of elvenkind grant competence bonuses to Hide checks, which means that the character actually gets better at hiding. Thus, they work normally against a character with
true seeing, provided the hider is able to make a Hide check in the first place.
I have read both of your posts. Please prove what you are saying. Especially the last part, I see absolutely no reason at all for true seeing to make hide in plain sight unable to be used. Nothing in true seeing says anything like that, nothing in hide in plain sight says anything like that, there is no correlation there.
I can't give an explicit statement that
true seeing works against a Shadowdancer's Hide in Plain Sight. The above is just how I would rule it based on my reading of the rules.