So what is it that your have to get for the Brazier in the Planar Prison? When I click on it to deactivate the thralls collars, it just says it looks like it waiting for something....

you need to kill the MAster of Thralls . he has the sphere controlling all the collars... when you take THAT to the brazier, the collars are deactivated. Good luck

Sweet! I found the orb. I had already killed the frigin' Master of Thralls but when he died the stuff he dropped on the ground was hidden behind a rock and really hard to see. Now I'm on my way to the take out the Warden! Thanks for the tip!

Just finished off the Warden. Took a few reloads, but I got the job done! Thanks for the info I needed!