I don't ever remember seeing this before. I was in a pretty fine PUG, as these things go, running the Harbinger chain on Elite. We get to the Final Edition, the big fight with Yulthoon.
Everyone knows the score, hiding behind the pods without direction. Nailing the Beholders as soon as they pop. Then we get to waves of Flayers and Yulthoon starts hitting us with the cone of multiple rays/waves that just tear through us. The hordes of Mind Flayers make it impossible to hold a covered position, and some of my party members seemed to think it couldn't be hidden from at all.
We wipe twice, and both times I still had plenty of charges on my Pale Lavender Ioun Stone, and I was raised a few times before the wipes.
The combat log calls this his "Mind Thrust."
Why don't I remember this? Is it an old thing that just seems to have taken a power boost like the MOB arties Lightning Spheres?
Is there anything that does defend against this Mind Thrust?