Thankfully, this fight was not developed by Blizzard - there's not some second, Worse, phase lurking behind the silver mist torn out of the cracks. It's just dead. Consumed. Well, not really consumed, consumed, but nonetheless, gone.
The next part is going to be the tricky bit.
These pieces of soul remember their bodies. They can be directed appropriately. But actually mending the damage...
That requires one of the two forces that created Creation, and not the one she's most comfortable with. She's no priest. She's not a paladin either. But the Light does respond to conviction, and in this matter, she has plenty. And the theoretical grounding to actually realize it.
"Healers, if there's anything you can contribute to this part, please do, this is going to take a lot out of me to come back from and every little bit could make a difference in just how much. If it gets really bad, if I'm not responding at all, anything that encourages my body to remind me it exists, in a pleasant way, is likely to help. ...Please note that I am a nearly obligate lesbian if it comes to that."
"I don't expect it will be that bad but, best overprepare rather than be caught out."
She stands in the center of her circle, as a bunch of intangible purple lines trace from the centerpoint of the mass of unaligned Spirit to each and every 'Unsuccubus'.
She centers herself. This is abomination. This is positively blasphemy. This she will not bear. The correct state of the universe is one in which these pieces of spirit/soul are brought together with themselves.
"Everyone ready?"