From publisher blurb:
CLASSIC DEITIES FOR YOUR CLASSIC RPG!
The powers of the Gods are mighty and mysterious, and so should the powers of their clerics be!
If you want to bring back some of that “old-time religion” to your Old School game, then this is for you! You will find Divinities and Demon Lords for Players, Referees, and Fans of Mythology, compatible with Swords & Wizardry, Dungeon Crawl Classics, or Labyrinth Lord.