Not sure if people already knew this but I found out last night that at the boss when his walls start to come towards you, you or someone on your team can just pop a bubble and the wall goes right through it and you are left unscathed. Everyone can be in it until the wall runs its path, and you can right away continue to DPS the boss, as opposed to running to another side where the walls aren't closing in on you and you're not shooting the boss because you are scrambling to stay alive. Again, not sure if anyone ever posted about this but thought it was a helpful tip and was very helpful last night for a few runs.
Edit: I also had on Helm of Saint-14, but I don't think that had anything to do with it.
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What you do is have everyone stand in the back-center of the room. Kill the Harpies, drop the shield, then put a Rally Barricade on the front edge of the platform. When the Wall of Deletion starts getting close, back up a little bit and use Ward of Dawn. Your teammates can step back into the Bubble, let the Wall pass through, then step right back out behind the Rally Barricade.