This book is a fantastic resource for anyone wanting to make their monsters more unpredictable and mysterious. Tables upon tables to spark the imagination. I especially recommend the " O is for Ordinary" entry to give old favourites a bit more oomph.

As an example, I rolled up an angel with insectoid features and the ability to spit acid - and from that followed the creation of Xkrrrg the Many-Eyed God, lord of all that crawls and skitters for my campaign world.

And the whole thing is system-neutral, allowing you to use it with whatever system you enjoy. Given the modular nature of monster abilities in D&D 5e, for example, it's extremely easy to translate whatever table results you get into the game. And the same is true for most OSR systems as well.

Just some quick words...there are few, if any, rules per se in the book, most of it is setting and a couple of monsters. HOWEVER, the setting itself is super-evocative even though it does not overflow with details. To any experienced GM, those setting infos which are given should be more than enough to spark your imagination. If you're in any way a fan of The Witcher, Castlevania, Vampire Hunter D or even the metal band Powerwolf (The setting has vampiric paladins and (Were)Wolves of God, for Christ's Sake! What's not to love?! Sorry, I am gushing) then this is a setting for you. Also, it has futuretech, dieselpunk, clockworks and magitech. I am not that fond of the OSR but bought this mostly because of the setting and I was not disappointed. I am definitely going to rob this setting blind for my next D&D 5e campaign. My favoure purchase this month.