This book takes the monster entries from E-K in the book and expands upon them, with new rules, variants, and monsters based upon that theme. 

From efreet to killer bee, this book takes a look at each monster from OSE/BX, examines alternate rules and options, provides some suggestions for variants as well as magical items that can be created from the creatures' remains, and introduces 3-4 new monsters per category based upon the monster's theme. This book also includes two playable race-as-class options -- the awakened giant ferret and loxen (psionic elephant-folk) -- new spells, a brief introduction to psionics, and more.