I don't understand Rhinedottir and Naberius
I get that Rhinedottir ate Naberius' heart and gained the powers of the Ruler of Life. However, how did Naberius even turn into a heart in the first place?
Also, is Rhinedottir supposed to a shade or not? Rhinedottir was a witch so why is she obligated to work for the HP after absorbing Naberius? From my understanding, Naberius has no agency over what Rhinedottir does. Why even agree to work with Ronova in the first place if she isn't obligated to? It's not like the HP demanded her to help Ronova as Ronova herself was working behind the HP's back.
I'm also not sure how the HP would allow Rhinedottir to exist with the powers of the Ruler of Life either. From my understanding, the HP does not approve of the Sinners, but then they are letting a Sinner work for them as the Ruler of Life?