The Fourth World, also known as the Age of Legend, was the previous cycle of magic before The Sixth World. The game Earthdawn takes place in the Fourth World. When the Fourth World began is unknown, though the average length of a World is 5,200 years. The Fourth World ended when magic diminished, and the island of Thera, enshrined in myth as Atlantis, sank into the ocean on August 12, 3113 BC, beginning the Fifth World. Some immortal denizens of the Fourth World have lived to see the Sixth World. Ehran the Scribe puts the era of the Fourth World as 8238 BC to 3113 BC.