From publisher blurb:
In the Deep Places of the Earth
They have slumbered for centuries, dreaming of the day when they will rise again. In ancient times, their cults extended into the hearts of great empires. They ruled from temples heaped with skulls that echoed with the discordant chants of the faithful, drawing humanity down a path of slavery and corruption. The Earthbound dream of a world in which humanity exists only to furnish them with power, offering up souls in an unending feast. Now their time has come again.
The Old Ones Rise
Demon: The Earthbound details the origins, history and power of these monstrous spirits, revered in the past as gods and twisted by centuries of mortal worship and depraved sacrifice. No longer angels nor wholly demons, the Earthbound are the nightmarish products of divine power and the darkest parts of the human soul.