I attempted this mission for the first time last night, but I've read over many different strategies on how to complete it. Obviously we failed last night, but I noticed something contrary to all the strategies I've read regarding Raubahn.
Now, everything I've read states that after his first reraise, he will develop immunity based on the primary damage source, and again after his second reraise. Well, on our second attempt, the blm, for whatever reason, decided to try to finish his first phase quicker, so he cast Freeze2 when Raubahn was at 10% for approximately 1400 damage. This was the only "magical" damage to effect him that entire phase, but when he reraised, he stated his line for magical immunity: "My body has tasted the fires of 10000 spells." or something to that extent. Obviously we had to quickly change our strategy since he developed this immunity out of sequence.
My question is this: Has anyone else noticed this event? Does anyone know if perhaps it's not the primary source of damage, but rather the killing blow that determines his developed immunities? Had this not happened I wouldn't bother to ask, but I'm greatly intrigued by this.
Thanks for any answers in advance.