Guy's, for fear's Embrace, hide in the entryway off of the top walkway. Do what you can to control adds approaching from the left or right, then DPS the boss when you have a breather for a few seconds. Try to stay centered in that little room/entryway so that when the boss does his burning air thing, you can back up all the way to the back wall to avoid it. I solo'd this mission on both my Warlock and Titan. Had to wipe a couple times, but it's totally doable. I think people are getting wrecked on it because they are staying out in the open and rotating around the map like with Skolas. The Telesto fusion rifle really helped me with this mission.