Just did NG+ to see how it is, here's my findings:
- I dropped to like 2k HP at one point thinking Blessing of Light regen would be as strong as it is for tanks or DPS (it's not), hit Essential Dignity, it crit and I was immediately full HP again. 85% ish of my HP bar instantly restored with one move, kinda wild.
I also got this pic (don't mock my UI) of a non-crit later which shows that if you're low enough (i was at 4k before the heal), the scaling makes it restore about half your hp bar which is... a lot, for a 40s CD, kinda shows the issue with damage incoming/healing we can pump, but that's a very beaten horse
- I purposely did not use Star or Div for the swords, killed them at 69 gauge (nice). OP, you say you're ilvl 400, can you double check your weapon specifically? The WeaponDamage stat is incredibly important for how strong you are so if your gear is all ilvl 400, but your weapon is 390, you'd actually potentially do less damage than if your weapon is 400 and every slot of gear is 390, it's that big a difference. Besides that, I'd say having Lightspeed is a bigger factor than Star or Div. Being able to keep casting even while moving is a very big factor for that phase. DOTs aren't super useful, I tried using them but the phase is so short they don't really have time to do their damage, better to just throw another malefic, especially if they're instantcast because of Lightspeed. If you happen to have Star, might as well use it too, but it's not 'needed' per se, same with a Lord
- Whole fight took around 5mins and 30s. That's a whole lot of Malefic