From the back cover:
All About Monstres
This volume contains dozens of new races and individual creatures for use with the Call of Cthulhu roleplaying game. Included here are the following categories: Outer Gods, Elder Gods, Great Old Ones, Great Ones, Avatars, Servitor Races, Independent Races, Fabulous Creatures, and Unique Entities.
These monstrous creations have been collected from fiction spanning over seventy years and from over ten years of favorite Call of Cthulhu scenarios. The darkly imaginative work of a diverse group of authors is represented here. Where possible each entry begins with a quote describing the monster or entity. Where much about the creature is known, there may be an additional description. If discussing a god, Great One, or Great Old One, notice of any human cult comes next. Further notes discuss habit, habitat, or attack.
An essential aid for players, investigators, and keepers.
"They walk unseen and foul in lonely places where the Words have been spoken and the Rites howled through their Seaons. The wind gibbers with Their voices and the earth mutters with Their consciousness. They bend the forest and crush the city, yet may not the forest or city behold the hand that smites." -- H.P. Lovecraft