400 DR


 * The Dark Alliance of humanoid races marches out of Thar and assaults Northkeep. More than 40,000 priests, mages, and shamans of the alliance perform a dark ritual that causes the city to sink beneath the Dragons' Sea. The allied forces also sack the nearby settlement of Phlan.
 * In the lands that would become Sembia, the cities of Chondathan and Chauncelgaunt are attacked by orc and goblin raiders. The battles continue for fifteen more years.


 * Chessentans cross the Wizards' Reach and found the city of Escalant.