The Age of Possibility is an era of ancient secrets, magics, and technology. This period of time encompasses everything before the rule of the Etti'Shi and disappearance of the Meneki. Very little is known about this era past the existence of the Meneki.
The era of Shi' Dominion is defined by the conquest and rule of the Etti'Shi over Myst. After the Meneki vanished, the Etti'Shi inherited their technology, becoming the biggest power house of the planet.
This era is marked by the crash arrival of Humans and Dwarves. These new arrivals had advanced technology as well, making them a threat to the Etti'Shi. After years of tension, the Ethral war would eventually break loose, causing the Rend, an event that would change the trajectory of Myst forever.
Myst slept for a thousand years, the only survivors being those that had hid below in seperated chambers. A lot of previous history was lost due to this era, and very little was kept during it. A number of civilizations were born in this era that still shape Myst today
The Reclamation marks the period in which the descendants of the survivors of the Rend returned to the surface to rediscover the planet. At varying times, some of the civilizations born underground began to reclaim surface as they tried to get their footing and peoples that had been seperated for a long time began to reconnect.
The Enlightenment began when Blycun, the first Planar god-entity, arrived onto Myst. Other planar god-entities followed as there was a huge shift in religion to Planar worship. A lot of other discoveries were made - including advancements in the understanding of the past civilizations and technologies.
The current era of Myst - the Mystic Era started with the discovery of the last continent, Emagest (also known as the Mystic Isle). This era is marked by dungeon delving for ancient tech, uncovering the past secrets left behind by the Meneki, the breakthrough of many Dias magics, and the rise and fall of many of the old empires.