This classic text is a hive of information about The Great Devourer and the various monstrosities under the control of the hive mind. If you are like me and shun the modern versions of 40K, this is a treasure trove of unbalanced and untested stat lines for everything from Genestraler Cultists to the Screamer-Killers of legend.
Despite my Ordo Xenos colleagues' protestations of heresy, me and my coven all agree that this book is excellent. We await the arrival of the Lords of the Void and work to undermine human society at every opportunity.
I hear them in my mind... they are coming! Glory to the Four-armed Emperor!
Buy this book for nostalgic and practial reasons.