Phase 1 there is no frontal AE, you can have LNC's use Collusion -> Doomspike to dump threat on MT.

But pro-tip, MRD is better tank for this fight. Similar damage taken, and absolutely no threat problems because they do ~60-70% of the damage of a DPS even while tanking (spam Storms Path)

To get shield skills to work remotely good you have to stack Ambidexterity now :/