Mahali said:
RAW - No.
Illusions aren't creatures, can't harm, don't threaten, and therefor can't flank.
Note: If you allow illusions to flank everyone around the illusion who might be threatened gets a saving throw every round as they are interacting with it.
RAW yes, illusions affect your state of mind, and flanking is about state of mind.
Note: Anytime anyone interacts with an illusion, that person gets a save. And being "flanked" by one is definitly interacting.
And more, of course. Illusions are left almost entirely up the the GM. Something like this is definitely what an illusion is meant to be used for. There are some GM's who just don't like illusions, don't like you, or don't really have imaginations. Now, while the latter would likely fail his own save vs. illusion and be flanked, you have to realize that you can't actually cast the spell on him, and therefore he's immune. Sad but true. O_O
^_^
For example:
MerakSpielman said:
The rules are exceptionally clear on this subject. They just don't make logical sense.
First: An illusion does not threaten an area.
Second: An illusion is not a character or creature.
A lot of people will just use that reasoning, ignoring the fact that an illusio can be OF a character or creature, and if someone fails his interaction save, he acts completely as if the illusion is. (Of course, one could interpret this as the illusion not giving the bonus, but the "target" of the illusion giving the bonus.)
MerakSpielman said:
The problem is that whether or not a creature is flanked has absolutely nothing to do with the perceptions of the creature in question, by the rules.
Also, by an interesting coincidence, if two allies are both invisible, and both move to opposite sides of a creature, and both attackers are unaware of each other AND the creature is unaware of either of them, they still get their flanking bonus.
edit: You also still get your flanking bonus if the creature you're attacking is helpless or asleep.
It makes absolutely no sense.
It's the way it is.
There have been debates about the invisibility thing. It's not so clear a ruling either.
But basically, you have to ask your GM if he believes in illusions, and if he says no, you have to ask him what, exactly, is he doing with those dice. I mean, isn't the entire game a form of illusion?
But, in reality, you should try not to be quite so sarcastic to your actual GM. He controlls illusionary meteors with a will save DC of infinity. That's 10k d100 damage.