They are thought to be formless shadowy beings in their basic state, just manifestations of pure Evil. The exact number is not known. The most postulated was twenty-three. The three chief Lords are known as Death and his two brothers Disease and Decay. Slangg and Tanit are sometimes referred to as such. Many scholars believe the spirit of War to be a further Dark Lord. Certainly Shekka, the ancient goddess of Witchcraft, is among their number and some believe The Malice is the diluted spirit of an unknown Dark Lord.
To see a chart showing known Dark Lords and their most powerful cohorts please see below.