actually, probably more like the dharculus. and then thow in a bit about being immune to divinations, or maybe give them nondetection if that will work better.
Immunities (Ex): A feystag is immune to all mind-influencing effects (including charms, compulsions, phantasms, and morale effects.) and spells from the divination school that target it directly (such as detect thoughts).
Perhaps is was good enough as
Immunities (Ex): A feystag is immune to all mind-affecting effects (including charms, compulsions, phantasms, patterns, and morale effects.).
it's a good question! i don't really know. looking at it again: "Feystags are immune to all enchantment/charm and greater divination magic (and psionics which duplicate such mind-reading and influencing effects)." it sure sounds like any type of divination would fail on a feystag. like i said before, perhaps continual nondetection is the way to go?