Nyx, the Spirit of the Night, was spawned from the primordial Chaos. After mating with Erebus, Nyx birthed the Upper Air (Aether) and Day (Hemera). On her own she gave birth to Doom (Moros), Death (Thanatos), Sleep (Hypnos), the Fates, and Nemesis. Her power is said to be great, overwhelming even Zeus. She lives in the palace of Tartarus and goes forth onto the world each night, traversing the heavens until daybreak.