From the back cover:This book includes: - More than 20 strange Abyssal entities and phenomena, including rules on how they enter the Fallen World, their goals and how to send them back to the void. - Ample story seeds and advice for using the creatures presented herein. - Speculation on the nature of the Abyss, including its effects on the physical world, Twilight, Shadow and the Astral planes. - BoardGameGeek