This got rough. Like, really rough.
I'm going to continue the series, but barely. It's probably a 1.5 star, but only because I reserve 1 star for things that are truly awful.
This whole book could have easily been a couple chapters, with Espir gains worked into previous books. Its a whole separate magic system and setting and enormous cast of short-visited characters that are wholly unnecessary. It could have been resolved by a boon of creative use of something.
That would have also avoided the really dumb plot, which is essentially: the Goddess previously banished Emma for being impatient and thinking her stuff is the most important and accidentally killing a creature, but now that Emma is back and is still impatient and still thinks her stuff is the most important and is planning to PURPOSEFULLY kill and consume thousands of creatures, the Goddess is cool with it and will help because it'll be in a slightly different realm. Even though the Goddess punished Akir for doing the same thing in the past. ???
Also, at the end of the last book, Emma severed herself because she chose her own potential death over her friends or getting back to her family. But now she's alive and willing to kill a bunch of beings to get back? No plan, no continuity.
The dream world is written jarringly, randomly jumping from topic to topic without payoff or purpose. This book feels like it should have been a spin off series-- events don't fit into the main series, and this book didn't spend enough time on individual events, leaving them feeling hollow-- like the whole book is a training montage.
The author's overuse of certain phrases, like "after all" and "Moreover" got even worse to the point of being painful.
Emma is magical and perfect and smart and lucky and overpowered. The plot armor is so thick that we didn't even attempt to make it feel like she was truly at risk. It's boring.