Pretty much a necessity for every game master, BUT not great.
It certainly gives the stats for every monster you could need but disappointing is the lack of background information on every creature and the is the absence of artwork for 95% of the beasts and monsters.
So what you get is pretty much well layed out but raw stats for your encounters. Disappointing compared to the high quality of the players Guide and the Gazeteer!
[3 of 5 Stars!]