Though demons are notorious liars, more reliable sources trace the genesis of the Class Two Demons (Hell-lords) to the primeval concentration of evil energy left behind when Demogorge drove the evil Elder Gods from Earth billions of years ago. That energy eventually gave rise to demons, shaped by the unconscious desires of their earliest human worshippers. These included at least Mephisto, Satannish, and Thog, though many others followed, each ruling their own nether realms. Other Hell-Lords arose from fallen gods and angels, such as Lucifer, cast down from Heaven. Marduk Kurios was worshipped by the ancient Sumerians thousands of years ago. It is unclear whether some Mesopotamian Gods (Annunaki) may have usurped names and worshippers of demonic predecessors (as the Egyptian Seth did to the Elder God Set), whether some Gods degenerated into demons or assumed alternate roles such as false angels after being deprived of worshippers in later millennia, and/or if gods may have split off demonic counterparts, or vice-versa. Regardless, the above mentioned demons and many others capitalized on the eventual human belief in a single lord of evil, Satan, each claiming to be that being and naming their realms Hell. Numerous, often unidentifiable, Satans and Devils have encountered humanity throughout history.