Originally Posted by
mooshoo
As affliction you can cheese it, stand on top of the meelee add, and as he turns to hit you use a infernal to taunt him, then make sure to not rip aggro off of your infernal. Once he reaches 21.5 million hp he will start to phase, you can then deathcoil right before he starts his casting animation this will cause the boss to keep hitting your infernal, allowing you to skip phase two. Next blow up raest, and collect your reward, you wont have to deal with the portal things that one shot you as they wont spawn, and may have to just deal with the adds Raest summons, and the occasional summoning platform that you have to stand on. - found it on a reddit post though I cant link it as i'm a new member.