THE FOURTH AGE
Historians put the Fourth age's start when the Great Library was lost, there was a great war, and Sangkelvolm mythic disappeared. There are steps that started here that then lead to the Great Demon Flood - which many other people's in the world take as the ends of various ages. The demons spread across the world, not just the Eldland continent.
The Fourth Age was 12,167 years long.
(3728) Flood of Demons. They called these days the Ebon Days, and there was so much destruction that heros were hard to find. Within these days
The demons were driven back some 1,276 years later in the Break Demon War.
The age continued some time in strife and distrust. Races numbers grew - but the distrust and secular beliefs split the world with the War of Wars
Tivalera - 6th Era, 7th Era, 8th Era
The 7th Era was started at the Demon Flood
Xinji - the Emperor finally unites and holds the land - which is why they revere him. Bai Ze Warlords, Lotus Empire, Jade Dynasty, Pheonix Years, Song Dynasty, Time of horns and antlers, Red Fish Dynasty, Compass Warlords
The Jade Dynasty started at the Demon Flood. Jade was said to be the best weapon against the demons.
The Blood Age - obviously corresponded to the Demon Flood
United Isle - left Island discovered by air from Tivalera. Age of Legends
Tri - Uplift 2 & 3