The veiling of death and the creation of the shadowfell.
Timeline of the history of the Northern Peninsula of the Great Isthmus.
An era when the dead (or undead) held power and dominion over the living. In this age, mausoleums were cities in their own right, and often of greater quality than cities of the living.
The veiling of death and the creation of the shadowfell.
An age of conflict, yes, but also of great cooperation to build an expansive, beautiful society made up of multiple civilizations, and an attempt to push back the wildness and fair-nature of the peninsula's wooded center.
The collision between the earth and the moon, followed by the geo-system being hidden in a pocket dimension.