SPOILER ALERT!
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In the final battle, in SoA, Irenicus summoned those 4 demons, then put up his own spell protections, and cast mislead - as usual. I almost got used to the scheme

But he turned to a slayer first, so I was thinking of using the ability myself, but the circumstances were stronger than my will. Remembering our previous fight, I made my Imoen fire arrows from gesen at him to disrupt his castings, and swiched my fire/sword power to the demons.
A turn later, the demons were over, I ressurected Minsk and cast a dispell at the slayer (it was staying motionless all the time, not casting even a magic missile!). It turned out to be a mislead illusion. But the REAL stayer was gone! After a bit of searching I foung it staying at the other side of the column. It was full of protections - fireshield etc. I decided to wait a bit, got out of its LOS (it didnt attempt to attack me!). Then, saved and rested! no interruptions. Woke up to find the fool creature at the same place with no protections at all! So enraged/engaged and disrupted all the casting attempts, finally not getting a scratch from the Irenicus itself... What was the use of turning into the slayer, then?