Okay, I just tried out the Kangaxx encounter. I had to reload twice, once, with me sporting Stoneskin, second, with me sporting Stoneskin and Improved Invisibility (hey, I thought maybe me saves needed help). Here's the question; how did they kill me? I was at 160/180 HPs, with the Belt of Inertial Barrier. My saves aren't bad; I think the second time, with the Improved Invisibility, the worst is -3 (spells). Not bad. Yet, somehow, they managed to kill me.
I know it can't be Abi-Dazlim's Horrid Wilting; with my uber saves, it would've done half damage, and another half damage with the Belt of Inertial Barrier. Making it do a total 1/4 damage. Even with both liches Horrid Wilting wouldn't have done do much damage. I don't think they killed me with an instant death spell; saves, once more. Maybe a conjunction of Greater Malison and Finger of Death?
Third time, I decided to pull out all of the stops. As soon as I went in, I summoned a Planetar, and hopped outside. That made them get a target lock on the Planetar, and allowed me to wait out the spell recharge time in peace. To compress the story, the Liches summoned two Hakaeshar, the Planetar died, I summoned up another one, while spamming Horrid Wiltings.
Anyways, to summarize, here are my two questions: What killed me? Second of all, when I used True sight, the Mirror Image disappeared, but the Simalacrum didn't. What's the deal here?