Didn't see this post yesterday, but we basically ran two titans and a warlock (me). Tried it on my hunter which is 301 but it just wasn't happening, so switched to the easy mode warlock stormcaller and got it first time. The two titans went and popped bubbles on the boss and used swords, and only focused on him, while I took care of all the Spawning orbs, & the adds with the Stormcaller super.