Hadean
The Hadean () is a geologic eon of the Earth pre-dating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago. , the ICS describes its status as ""informal"". Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the "Priscoan period", from "priscus", the Latin word for "ancient". Other, older texts simply refer to the eon as the Pre-Archean.
Age of Mythology
Ages before, the Earth was ruled by the Titans under Kronos. Zeus stopped Kronos and imprisoned him in Tartarus, behind adamantine doors. However, Poseidon, who is envious of Zeus's power, is trying to free Kronos and the Titans in order to destroy Zeus so he could claim the throne. Gargarensis is aiding him because Poseidon and Kronos have promised him immortality as a reward. Athena asks Arkantos to stop Gargarensis at all costs, as Zeus himself cannot interfere.