-400 DR


 * Elves migrate into the lands of the ancient black dragon Thauglorimorgorus the Black Doom, King of the Forest Country.
 * Circa: Calimshan attempts to colonize the area surrounding the Deepwash.


 * Circa: The Lost Sage Augathra the Mad is on her travels around the world and divining many of the names in the Roll of Years, adding to those of the Netherese wizard called the Terraseer and the seer Alaundo. She also develops the secret Black Chronology.
 * Circa: Netherese archmage Lady Polaris discovers the plane of Mechanus and the modrons on her explorations.