A Hardcover supplement for Advanced Dungeons & Dragons 1st Edition
First Printing: 1983
from the back cover:
A must for the serious AD&D game player. This manual contains all the new members, from Abishai to Zygom, including new creatures like the Deadly Pudding, Devas, and Valley Elves. And you'll also have the advantage of the expanded lists of lycanthropes, giants, and other beasts.