This book shines at its best when it is focused on what is obviously the core of the story, the differing perspectives on the Lumineth and Idoneth lifestyles, and how both groups view the god that created them, Teclis. If that core had been the focus of the book, then I easily could see it being one of my favorite in the Warhammer series!
Instead, we have plot points about Necromancy, Nagash, and the his potential return which just feels like padding and a waste of space! The Ossiarch’s in this book have none of the character that you usually like to see in their more focused series. Nagash, if you have no understanding of who he is, is literally just a boogeyman with which to kickstart the plot!
The results of this leaves the book lacking, as if the author set out to write an IDK vs Lumineth book, and was forced to include the Ossiarch and Nagash plots for company mandates. Overall, 3/5, because when the book is focused on its emotional core, it is so good!