BX Advanced Bestiary, Vol. 2

This is a 137 page pdf.
 
This book takes the monster entries from E-K in the Old School Essentials Classic book and expands upon them, with new rules, variants, and monsters based upon that theme. It will be available as a pdf, POD soft and hardcover, and as an offset book available through the author's website.
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.
Vol 1. of the series can be found here.
 
This book is also available as an offset hardcover.