-24000 DR


 * Circa: The god Ubtao summons couatls from a western continent to serve him in Chult.


 * Circa: The great wyrms of the southern lands continuously assault the cities of Mhairshaulk, causing the yuan-ti realm to fall.
 * Circa: Couatls and yuan-ti begin a millennium of warfare for control of Chult, eventually settling in stalemate.