The Night Lords were originally the VIIIth Legion of Space Marines created during the First Founding and became one of the 9 Traitor Legions of Chaos Space Marines that betrayed the Emperor of Mankind during the Horus Heresy of the 31st Millennium. They do not worship any of the four Chaos Gods individually, but acknowledge them equally in the form of Chaos Undivided as they ruthlessly spread terror and fear amongst the galaxy's inhabitants. The Night Lords are experts in the use of terror tactics to win battles and demoralise their foes before the main combat even begins.