Lords of Chaos is a 64-page book that includes:

• Complete descriptions of more than 40 demon lords and their terrifying realms, including the demon queen Lamashtu, Mother of Monsters.
  
• New rules and special abilities for worshipers of individual demon lords.
  
• Rules for the demoniac prestige class.
  
• A detailed history of the Abyss and the disturbing origins of demons as a race.
  
• New demonic spells and magic items, plus rules for demonic implants and becoming a demon.
  
• Overviews of the different types of demons, plus tricks to aid in their summoning.
  
• Descriptions of the Abyss's other residents, such as writhing soul larvae and the sinister, primordial qlippoth.
  
• Rules for creating new nascent demon lords.
  
• Statistics for four new demons ready to bring the horrors of the cosmos to players’ doorsteps.