This segment was pretty good about teaching the mechanics along the way, but the last part of the boss fight gave me fits, and I wonder if I missed something. For the last part of the fight, I'd pick up the Facet of Light and the Facet of Dark, but the AoE was so constant that it would burn through my Light shield and make me drop the Dark before I could get close enough to use it. I tried timing it to rush in where the outer ring had a gap, but it was still not enough, and I ended up just slowly chopping it down with pets.
Before I take another character through the story, does anyone know if this was working as intended, or if there was something else I needed to do before picking up the Facets?
Good luck, have fun.