remove undead illusion
 

as a gnome PC uses an undead monster be his illuision. can someone play the GRAVE ERROR to remove undead monster against the PC so what ever they're fighting can see the PC for their true self?

Re: remove undead illusion
 

The gnome's illusion ability only causes the monsters level to be added to yours in combat.

I do not believe that the illusion can be counted as things like undead, I've wondered this myself for things like Necrophobia or if the monster used has special bonus' when used against specific races or classes. But hearing that sentence I believe the first sentence is how the ability works.

Re: remove undead illusion
 

It's an Illusion, not a Monster, at that point. Grave Error won't work on it (but remember, as per the description of the ability, Monster Enhancers will).