Queen Amid Ashes

Queen Amid Ashes really was Sun Eater 2.5. The story takes place between Howling Dark and Demon in White and also follow Hadrian with the well known first-person narration.

While The Lesser Devil felt like an action packed side step, this felt more like a must read addition to the main story. There are nice elements that deeper the world building and Hadrian has some small, but important, character development.