How come mindless undead are not immune to psychic damage?
Truesight: The monster automatically sees through illusions within the specified range (in squares) and within its line of sight. ~MM
41 creatures with truesight by compendium
ie - creatures resistant or immune to psychic damage, not creatures immune to illusion.If one creates a PC that has only one schtick, sooner or later that PC is going to be in trouble when an encounter is resistant to that schtick.
Yeah, I finally double-checked my Monster Manual, and truesight definitely only reveals invisible creatures and objects in range.
At that point, though, you're making illusion immunity effectively useless without corresponding psychic immunity, and there is no monster yet printed with both.
I like the "take the damage, but no other effects" idea, although for stuff like Phantasmal Assailant it might be better to give nothing at all. I can see this one being more case-by-case.
Does anybody have a rules reference for what immunity actually means?
Truesight: The monster automatically sees through illusions within the specified range (in squares) and within its line of sight. ~MM
41 creatures with truesight by compendium