From a publisher product list:
"ILLUSTRATED WITH OVER 125 CREATURES for Role Playing Games. COMPLETE ENCOUNTER TABLES, Treasure Types, Random Creatures and Alienoids. Random Exotic Plants."
A book of monsters for fantasy/post-apocalyptic setting originally described in Exotic Characters and Worlds for Role Playing Games.
Unlike its predecessor, this book doesn't seem to use Gamma World rules for its post-apocalyptic monsters, but the table of contents lists radiation matrices and random mutation tables that don't actually appear in the book!