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I was reading a magic guide on:
http://www.shsforums.net/topic/54584-guide-about-mages-in-baldurs-gate/

And I was wondering if thief detect illusion is countered by any spells. Usually people say that it IS a true sight.
But true sight can be defended against with "Spell Immunity: Divination" which cannot be dispelled until you breach 2 layers of anti dispel protection.
Does the engine actually consider it a true sight attempt or is it its own unique thing? And if the latter, then does anything protect against it? (I hear you need over 100 points in it)

If the thief detect illusion ability is not a true sight and is truly unblockable then it drastically alters the breach order. As even a fully buffed enemy can be taken out as simple as:
1. thief detect illusion
2. everyone melee/ranged attack enemy to death.
Post edited September 09, 2013 by taltamir
This question / problem has been solved by Hickoryimage
The Thief's Detect Illusion is an innate ability, not blocked at all by such measures as Spell Immunity: Divination. In actual use it is like Hide in Shadows and Detect Traps, meaning there is always a chance of the ability failing. At 110% it 'usually' dispels most if not all illusions, with the aforementioned chance of failure.

Edit: Oh, and don't forget that the lower the thief's DI score, the slower it is to kick in -- and it's slower than an equivalent mage spell anyway.
Post edited September 09, 2013 by Hickory
Also, armour has no effect on it.