Cryptic (geology)
The Cryptic era is an informal term for the earliest geologic evolution of the Earth and Moon. It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun close to 4533 million (about 4.533 billion) years ago when the Earth and Moon formed. No samples exist to date the transition between the Cryptic era and the following Basin Groups era for the Moon (see also Pre-Nectarian), though sometimes it is stated that this era ended 4150 million years ago for one or both of these bodies. Neither this time period, nor any other Hadean subdivision, has been officially recognized by the International Commission on Stratigraphy.
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.