The best thing about the new Book of the Damned that can truly be said to be original to it, is the completed list of obediences. The rest of the material consists of reprints from the prior Books of the Damned, or retcons to that material that create new problems. As seems to be the usual case, the demons and the devils take the lion's share of the material, while the daemons, despite theoretically being among the Big Three of the fiendish races, are left to language in comparative obscurity; minor demon lords receive longer write-ups than in prior books, and Asmodeus' Queens of the Night get full write-ups for the first time, but among the deamons the Horsemen and the Horsemen alone receive any attention.
Perhaps the worst thing about the book however, is the artwork. While there are a few good, new pieces, usually marking the spaces between sections, most of the individual portraits of the archfiends are reprints from prior books or stunningly ugly (or in the case of the archdevil portraits from Bestiary 6, both).
I loved the prior Books of the Damned and wanted to like this book. In the end though, what little new material there cannot compensate for the book's faults, and the bad quality art makes it actively cringe-inducing to look on. Save yourself the money and buy something else.
