From the back of the book:
Cerilia: Where gods died and kings now rule with divine powers. Where dark powers contaminate flesh and blood, and evil shows its true visage in the abominations that stalk the land. Where monarchs both true and corrupt clash over rulership of the Birthright campaign world!
This book, designed for the Dungeon Master, is a guide to the most dangerous creatures on the face of Cerilia: the awnsheghlien. Sovereign creatures of their own realms, these dak creatures wield their power with iron fists, and many seek to tear more power from weaker leaders. These 128 pages' worth of monstrous dictators and wandering nightmares will strike fear into the hearts of all blooded rulers from the Sea of Storms to the Isle of the Serpent!
This book discusses a number of major and minor abominations. Each major abomination in a couple of paragraphs, giving background and stats for both the creature and its domain. Minor abominations are discussed in a couple of paragraphs, giving only a short discription.