Something from the Nightside is another piece of formulaic fantasy from Simon Green, who seems quite capable of writing formulaic fantasy or science fiction with his eyes closed and quite possibly while unconscious. His books are characterized by unique people with unique items wielding unique powers, to the point where the sheer uniqueness of everything (complete with capitalization) becomes tiresome and repetitive. This book is a fairly normal application of his formula.
That said, it’s not necessarily a bad formula. Something from the Nightside works well enough to entertain. And for certain purposes, such as providing inspiration for characters in a roleplaying game, it is very well suited.