This kinda sucked and wasn't really fun; I was just sitting there stressed for 7 minutes! But you gotta do what you gotta do.

My Brann was set to a healer, using Amorphous Relic and Unbreakable Iron Idol. I'm really not sure how useful Iron Idol is overall, but any time the boss isn't hitting you is time where you're not at death's door from something you can't dodge.

Gear: https://imgur.com/H0hNkF5
Talents: https://imgur.com/AyN7dJU
DPS Breakdown: https://imgur.com/n7LeACG